Office Online
  Journal Online
   Forthcoming Articles
   Current Issue
   Adv Search
   Archive
   Read Articles
   Download Articles
   Email Alert
   
 
  Member Service
2015 Vol. 32, No. 4
Published: 2015-04-30
 
1 Comprehensive Prospecting and Analysis of the Super Major Jinsha River Bridge
CHAI Chun-yang， ZHANG Guang-ze， JIANG Liang-wen， SONG Zhang
  Abstract：Research purposes： The super major Jinsha river bridge of the Lijiang-Shangri-La Railway is the first heavy railway suspension bridge in domestic. The bridge is located in alpine valley, rock mass of slope is in unloading and loose, with the characteristics of the development fault and frequent seismic activity, and the developed harmful geological bodies, such as rock debris, rock avalanche and falling rock. Based on the geology environment and the mechanical characteristics of foundation of the bridge, employed the comprehensive survey methods, analyzed the site and slope stability, got the foundation strength of the bridge to provide the basic data for the foundation installation and computation analysis of the bridge.Research conclusions：Adopted the comprehensive survey methods, such as the excavated tunnel investigation, drilling, engineering geophysics, geological survey, in-situ and indoor tests, analyzed and discovered: (1) The site of bridge is stability because of without the active fault in the Holocene passing, and the secondary geological disaster is lighter. (2) The bearing stratum for foundation is the schistose hard basalt, with high foundation strength. (3) The slope has deep unloaded and loosen zone, and part of developing the rock debris, rock avalanche and falling rock and discontinuous structural plane. However, the slope of bridge foundation is in stability, and the scheme of bridge is feasible after the reinforcement measures for the slope. (4) The comprehensive survey methods of this paper are reference for the engineering geological investigation of bridge in alpine valleys with high intensity.
2015 Vol. 32 (4): 1- [Abstract] ( 2728 ) HTML (1 KB)  PDF  (1517 KB)  ( 474 )
6 The Role of Geological Route Selection in One Section of Georgian Railway Project
WANG Bo
Abstract：Research purposes： The primary design plan of Georgian modernized railway applies tunnel to go through the upper part of Babi village ancient landslide in the section of KM 12+100～KM 13+600. It is known that engineering construction is easy to disturb the large ancient landslide and cause incalculable loss. This paper described how to use the comprehensive geological survey methods, such as remote sensing interpretation, geological mapping, geological exploration and so on to identify the elements of Babi village ancient landslide and analyzed its cause. The route bypassing plan was proposed. Research conclusions：(1) By using comprehensive geological survey methods，the investigation works brought out that the size of the landslide was about 520 m long and 270 m wide, with the shape like an inverted pear. (2)It ensured the type of the landslide belonged to rock-cutting landslide, which may be caused by strong earthquake. (3)Thanks to the "Single Rotary and Double-Tube Core"drilling technique, the location of sliding surface and affecting depth for the project were identified. (4)Combined with the survey data, preliminary design plan would have serious risks. The reasonable route bypassing plan which should go through the inside bedrock area was proposed. (5)This paper has a certain guiding significance to the investigation and route selection works in the landslide area.
2015 Vol. 32 (4): 6- [Abstract] ( 2763 ) HTML (1 KB)  PDF  (884 KB)  ( 154 )
10 Development and Application of Automatic Monitoring System SMAIS for Settlement of High-speed Railway
ZHUO Yi, WANG Xu, ZHANG Jun
Abstract:Research purposes:In order to solve the high-speed railway settlement problem, this paper researches a Structure Settlement and Deformation Monitoring and Analysis Integrated System(SMAIS) for high-speed railway. The SMAIS system is composed of sensor subsystem, data collection transmission subsystem, data real-time tracking and remote query by client end subsystem, monitoring results post-processing subsystem, automatic early-warning subsystem, manual measurement data management subsystem and data analysis and evaluation subsystem. And the field experiments were successfully carried out in part location of Beijing-Tianjin inter-city railway project for long-term automatic monitoring by SMAIS.
 
Research conclusions：The engineering verification results show that: (1) The SMAIS integrated monitoring system has a good monitoring precision, higher stability and applicability for engineering structure settlement automatic monitoring of high-speed railway.(2) Data track and remote net dynamic query platform of SMAIS realize the automation, real-time transmission, visualization, remote query technique monitoring, automatic alert and generate report functions target, the large manpower has been saved. (3) The alert subsystem of SMAIS realize automatical alert and alert information analysis function, it provide a scientific guidance for construction and decision-making. (4)This system can be used in settlement monitoring of high-speed railway subgrade and bridge
2015 Vol. 32 (4): 10- [Abstract] ( 2937 ) HTML (1 KB)  PDF  (826 KB)  ( 188 )
16 The Analysis of Main Geological Problem and Causes of Lhasa-Xigaze Railway
 
ZHANG Wen-zhong
Research purposes： Lhasa-Xigaze Railway travels across Yarlung Zangbo suture zone with complex geological conditions. Especially, due to the Yarlung Zangbo valley area traverses Damxung-Yangbajain-Nimu-Duoqingcuo geothermal active belt, the complex terrain and more development faults lead to the geological problems, such as geothermy, rockfall and sandstorm, which are developed along the line. According to studying the cause and distribution range of the geological problems, the rational basis for line and design scheme selection can be obtained.
 
Research conclusions：(1) Due to the Yarlung Zangbo section of the railway traverses Damxung-Yangbajain-Nimu-Duoqingcuo geothermal active belt, the geothermy is developed in this region. According to the geo-temperature test results, the main part of the tunnel in Yarlung Zangbo valley area was located in the low temperature zone, and a little part in medium-high temperature zone. The magmatic melt at about 6 to 8km below the ground surface is the main heat source. And the deep and large faults have provided the well storage and movement spaces for the melt. (2) The geological structure, neotectonic movement, stratum lithology and topographic are the main factors that affect the development of rockfall on both sides of the valley. Besides, there are external factors influenced the development and they are meteorological condition, unloading action and weathering action. (3) The sandstorm areas are mainly located along the wide valley of Lhasa River and Yarlung Zangbo River and Jiqiong pass. The types includes shifting dune, semi-fixed sand dune, barchan dune, longitudinal dune, semi-fixed sand land and drifting sand land and so on. The formation and distribution are controlled by the special climate, environment and human activity. (4) The research conclusions have been successfully applied in the geological route selection and engineering design and can supply references for similar engineering construction.
2015 Vol. 32 (4): 16- [Abstract] ( 2649 ) HTML (1 KB)  PDF  (459 KB)  ( 127 )
21 The Charateristics of Permafrost on the Northern Slope of Qilian Mountains and Its Engineering Treatment Measures Hot!
YIN Hong-yuan
Abstract：Research purposes： Frost heaving and thaw settlement of permafrost have great influence on engineering construction. The Lenglongling of Qilian Mountains is an area with high altitude and extremely cold climate. And the permafrost is distributed above 3400 m elevation from related articles. The 2nd Lanzhou-Xinjiang Railway crosses the Lenglongling by tunnel group, and the elevation of each tunnel entrance of northern slope is all lower than 3400 meters. Finding out the permafrost lower bound and the engineering characteristics of the permafrost are of great significance for the tunnel design and construction safety.
 
Research conclusions：(1) The research shows that the permafrost lower bound in elevation of the north slope of Qlilian Mountains is between 3170~3390 meters, the thickness of the permafrost is between 0~23 meters, and the ground temperature is between -0.05~0.05 ℃. It belongs to extreme instability regions. (2) The distribution of permafrost is closely related to the lithology, water content, air temperature, ground temperature, slope aspect, vegetation, etc. The exit section on shade slope of each tunnel has patchy permafrost, but the entrance section on sunny slope has no distribution. (3) According to the characteristic of permafrost, the relevant engineering adopted the corresponding treatment scheme. (4) The conclusion that the correction and the engineering characteristics of the permafrost lower bound has reference significance for similar engineering construction.
2015 Vol. 32 (4): 21- [Abstract] ( 3850 ) HTML (1 KB)  PDF   (0 KB)  ( 83 )
27 Genetic Mechanism and Treatment Measures of Landslide for Cutting Slope
SONG Zhang, WANG Ke, CUI Jian-hong, WANG Guang-neng
Research purposes： Based on the comprehensive surveys of the engineering geological investigation, drilling, geophysical prospecting and engineering test, analyzed systematically the genetic mechanism of Daboluohei landslides for Kunming-Guilin Railway by means of researching the engineering geological environment, mined-out area influence, rainfall and construction and so on, and proposed the treatment measures of the landslide. This paper put forward the treatment measures and analysis methods with the reference to the similar projects.
 
Research conclusions：（1）The landslide formation was mainly affected by the stratigraphic lithology and mined-out area, the dilative rocks such as sandstone and mudstone which formed under the special sedimentary environment had the characteristics of poor diagenesis and low mechanical strength, and the disturbance ring which formed because of the mined-out area further reduced the mechanical strength of the regional stratigraphic lithology. （2）The in-situ rock strength parameters were low more than the parameters of working drawing, the slide force of rock mass is greater than the resistant force of the anti-slide piles, and it caused the first row piles overturning deformation. After the first level excavation slope slid, it resulted in the anchoring depth of the second row piles decreased short more than previous environment, and caused ultimately the second row piles inclination and deformation, and in the end the engineering landslide formed.（3）The failure modes of the engineering landslide presented the over-type damage of its low part and crack-type damage of its upper part. （4）For the treatment measures of the landslide, first cut upper part of the landslide, and then design reasonably anti-slide piles by the mechanical index, at last set up the drainage measures of the surface water and underground water.（5）The research conclusions can be widely applied in the survey and construction of cutting slope in similar geological condition of railway and highway.
2015 Vol. 32 (4): 27- [Abstract] ( 2704 ) HTML (1 KB)  PDF  (1156 KB)  ( 127 )
32 Formation Mechanism and Treatment Measures for Volcanic Cavity Found in the Construction of Ethiopian Railway
 
WANG Mao-jing, ZHAO Ping
Abstract：Research purposes：Sebeta～Mieso section of the new Ethiopian railway is located in the Great Rift Valley, passing partly through the slope toe plains of Fantale dormant volcano, where a lot of small explosive volcanic cones are distributed and several developed ground fissures cross under the railway, the volcanic cavities concealed in the underground will endanger the safety of the railway works. Through the comprehensive ways of regional geological information collecting, geological investigation, geophysical prospecting and mechanical drilling in fieldwork, the distribution law of the volcanic cavities is found out to correctly evaluate the influence of cavities on the railway engineering, which is good for taking corresponding treatment measures to ensure the safety of the engineering.
 
Research conclusions：(1) Fantale volcano and plains region at the slope toe are the active district of the crustal plate and the quaternary volcano aggravating activity district. (2) Lava cavity, erosional cavity and ground fissure cavity are distributed along the railway. These cavities are closely related respectively to magmation, crustal motion and hydrodynamic activities. (3) There is no lava cavity existing underneath the subgrade. As for the ground fissure cavity and erosional cavity that endanger the safety of the railway engineering, the available treatment measures are put out for the cavities and the increasing expenditure is controllable.(4) This research conclusions can be applied to the geotechnical investigation field in volcanic activity region.
2015 Vol. 32 (4): 32- [Abstract] ( 2664 ) HTML (1 KB)  PDF  (441 KB)  ( 134 )
36 Application of BIM Models in Detection Technology of Subgrade Compaction
ZHAO Long, MIN Shi-ping, ZHAO Liang-liang
Abstract：Research purposes： Subgrade compaction is a crucial link in the construction of railway roadbed, and the degree of compaction is the key to quality assurance of roadbed construction. For a long time, testing compacted roadbed always suffers from long delay, high frequency and heavy workload problems. Those problems seriously influence the construction process and cause unpredictable economic losses. In order to deal with those problems, it proposes a detection technology of subgrade compaction using BIM models, and this method achieves automatic sample, disposition, integration display and management, reduces the manual operation and improves the efficiency of roadbed construction. Research conclusions：(1) BIM technology is introduced into the construction of railway roadbed can improve accuracy and quality of subgrade construction, control the construction cost. (2) The algorithm of BIM models generation based on mileage can eliminate the jagged edges of discrete data, reduce the data redundancy and automatically construct the relationship between geometry models and roadbed compaction information. (3)The accuracy of roadbed compaction depends on the accuracy of GPS in construction vehicles and the grid size of BIM models. Generally, the smaller the gird size is, the higher the accuracy is, and the slower the computation speed is. So during construction, using 0.1 m gird size can guarantee both accuracy and speed. (4) The research results are of significance for railway construction management using by BIM technology.
2015 Vol. 32 (4): 36- [Abstract] ( 2760 ) HTML (1 KB)  PDF  (649 KB)  ( 192 )
42 Safety Analysis and Protection Scheme Research of Wenzhou South Block Post
 
 Hot!
CHEN Yu-ping，LI Qian-she
Abstract：Research purposes： In order to solve the problem which Wenzhou South block post does not meet the conditions of setting catch siding, we find some risk conditions by the safety analysis of a train runing between the block post and Wenzhou South Station. We put forward some protection schemes by researching the relevant specifications, block post layout and signal control system.
 
Research conclusions：(1)Recognizes 8 kinds potentially risk conditions from 20 kinds of conditions, in which the SZ-front straight back side and SZ-front side back straight need to focus on prevention. (2) The on-board equipment can ensure traffic safety in a variety of operating conditions, when the equipments are normal. (3) When the trains running in reverse direction and the automatic block bewteen Wenzhou South Station and Qingtian Station is setted, all the conditions are safe. (4) The security solution is that optimizing traffic organization, moving the block signal of the block post farther or the latter signal displaying red repeatedly. (5)This method can be a reference to a similar traffic safety analysis.
2015 Vol. 32 (4): 42- [Abstract] ( 2730 ) HTML (1 KB)  PDF  (462 KB)  ( 125 )
48 Evaluation of Ride Comfort Caused by Track Vertical Alignment of High-speed Railway
LONG Xu-you1, SHI Jin2, FANG Wen-shan2
Abstract：Research purposes： The frequency distributions of the vibration excited by track alignment of high-speed railway are mainly below 1 Hz. In order to distinguish the vibrations excited by track alignment from those excited track irregularity and so on, evaluate the comfort and determine the parameter of track alignment, the evaluation of the motion sickness and ride comfort caused by track vertical grade sections is performed with the frequency distributions 0.02~4 Hz and 0.5~80 Hz, respectively, based on the comfort assessment method proposed by ISO 2631.
 
Research conclusions：(1) The length of the intermediate grade section between vertical curves has a great impact on the overlap of the vibration excited by the beginning and ending of vertical curves, and the vibrations can be attenuated remarkably and the vibration overlap can be avoided when the length of the intermediate grade section is longer than 200 m. (2) The vibration frequencies aroused by vertical curves are related to the running speed and the length of grade sections, and may be in the ranges of the frequency bands of motion sickness. (3) The motion sickness and ride comfort caused by track vertical alignment are mainly influenced by the algebraic difference between adjacent gradients of adjacent grade sections and the length of intermediate grade sections, and the minimum length of the intermediate grade section are proposed taking the vibration overlap and motion sickness into account. (4) The comfort assessment method proposed in this paper based on the method for low frequency vibration proposed by ISO 2631 can be applied to the analysis of the track alignment of high-speed railway.
2015 Vol. 32 (4): 48- [Abstract] ( 2736 ) HTML (1 KB)  PDF  (671 KB)  ( 157 )
54 Application Study of the Structure of RC Pile-plank in Strong Development of Karst and Ballastless Track Railway Hot!
SUI Xiao-min，XU Zhi-yong
Abstract：Research purposes： When build ballastless track railway in the karst region with strong development, the district which is conditional to set bridge selects bridges，but for the station throat area without the condition of bridge，the high fill subgrade design is a difficult problem, because filling the embankment will increase the additional load of karst roof, accelerate the occurrence of karst collapse. How to take measures to control the influence of the subgrade filling on karst, reduce the impact of karst collapse on safety and stability of subgrade, and control the compression settlement of covered soil on karst is the key to solve the problem. Research conclusions：The embedded type RC pile-plank with joist is the use of the upper bearing plank，the load will transmit to the pile, the pile will transfer load to the stable bedrock, both can solve the problem of karst ground treatment, and avoid the additional load of the filling against karst roof. The type RC pile-plank with joist has good integrity and stability. Its stress calculation changes from multiple pile of statically indeterminate structure to statically determinate structure, simplifies the calculation. It can be used for basal uneven hardness and difficult control of differential settlement of subgrade design, and has a good technical and economic superiority, can be applied in similar mountain railway engineering.
2015 Vol. 32 (4): 54- [Abstract] ( 2641 ) HTML (1 KB)  PDF  (817 KB)  ( 114 )
60 Research on the Low Frequency Vibration Attenuation in Track Structure Based on TRIZ Theory
 
YANG Ji-zhong1, YAN Hua1, WEI Yong-xing1, ZHENG Xiao-yan1, YUAN Zhi-gang1, CAI Cheng-biao2
Abstract：Research purposes： Based on the theory of inventive problem solving (TRIZ), aiming at the traditional FST′s phenomenon of low-frequency vibration amplification, the corresponding solutions were proposed in the FST′s design scheme for low-frequency vibration attenuation by inventive principle, flow analysis and other tools. Finally numerical simulation of vibration attenuation effect was carried on one of the schemes.
 
Research conclusions：(1) By the spatial separation principle, the "separated" slab track structure was put forward to resolving the physical contradiction in which the supporting stiffness under the slab must be lower to control vibration, at the same time, it must remain higher to hold the rail in smaller displacement. (2) In order to eliminate the influence of low-frequency vibration amplification, according to the flow analysis method, the FST's slab was elastically coupled with an additional mass resulting in a phase-inverted vibration flow at the similar frequency of FST. The resulting structure is called passive dynamic vibration attenuation floating slab track. (3) By the multi-body system dynamics (MSD) and finite element method (FEM) technologies, the vehicle-passive dynamic vibration attenuation floating slab track model was established. The results showed that the scheme could effectively suppress the traditional FST's low-frequency vibration at about 13 Hz (1st mode), the maximum of its vibration acceleration decrease from 1.06 m/s2 to 0.25 m/s2, a 76% decline. (4) The research results can provide references for design of low frequency vibration damping track structure.
2015 Vol. 32 (4): 60- [Abstract] ( 2704 ) HTML (1 KB)  PDF  (789 KB)  ( 268 )
65 Study on Arrangement Scheme of New Baishatuo Six Lines Yangtze River Bridge of Chongqing-Guiyang Railway
 
 Hot!
AI Zong-liang, CHEN Ke-jian, YAN Yong, YUAN Ming, TONG Deng-guo
Abstract：Research purposes： New Baishatuo Six Lines Yangtze River Bridge of Chongqing-Guiyang Railway is controlled by terrain, navigation, flood flowing, environmental protection, bridge site and so on, and the main bridge adopt (81+162+432+162+81) m six lines bridge across Yangtze River. In the world scope, large span bridge of six lines railway has not been constructed yet. Combined with the line conditions and bridge engineering, the arrangement scheme of bridge was studied.
 
Research conclusions：（1）Based on the factors, such as economy, landscape effect, convenient construction, the site condition and so on, it was recommended to adopt steel truss girder cable-stayed bridge scheme. （2）Based on line conditions, and based on the highway-railway bridge construction investigation at home and abroad, it was confirmed that "up 4 down 2" of six lines railway on two layers is the optimal scheme. （3）Inverted trapezoidal section scheme with 3 main trusses, bracket section scheme with 2 main trusses, inverted trapezoidal section scheme with 2 main trusses, rectangular section scheme with 2 main trusses were compared, and the research results show that rectangular section scheme with 2 main trusses is the optimal solution.（4）The research results can provide a reference for the design of multi line railway bridge or highway-railway bridge.
2015 Vol. 32 (4): 65- [Abstract] ( 2733 ) HTML (1 KB)  PDF  (956 KB)  ( 171 )
71 The Deformation Research on the Long-span Curve Continuous Beam of Passenger Dedicated Line
KOU Yan-chun
Abstract：Research purposes： The ratio of bridge in passenger dedicated line is increasing at present. The long-span continuous beams are widely used, with the characteristics of spanning capacity, big stiffness, less expansion joint and easy maintenance. The long-span curve continuous beams deformation is vital to track regularity and operation safety. Finite element analysis is realized basing on midas civil, including the deformation characteristics and temperature effect of long-span continuous beam. Research conclusions：From the research on curve continuous beam of passenger dedicated railway with the span less than 130m and the curve radius according to the specification requirements, it is concluded that：（1）The vertical and longitudinal deformation of the curve beamis basically identical with the straight beam.（2）The lateral deformation is mainly generated by live loads (centrifugal force and swing force) and temperature force. This kind of deformation mainly presents as mid-span horizontal deformation and the value is much less than the one given by the code requirements.（3）The deformation along the direction of the fixed points′ chord line of every point of the beam is caused by the heating and cooling process of the bridge system, and every point′ sradial deformation around the fixed points is caused by the temperature difference of internal and external web plates, the lateral deformation is safe and reliable to track structure.（4）The research achievements can be used in the design of long-span curve continuous beam of passenger dedicated railway.
2015 Vol. 32 (4): 71- [Abstract] ( 5073 ) HTML (1 KB)  PDF  (490 KB)  ( 145 )
76 Design of the Complex Geological Subsea Tunnel Hot!
YANG Yi-qiu1, ZHAO Jun2, YANG Gui-sheng1
Abstract：Research purposes：The subsea tunnel project in Taishan nuclear power station is the first subsea shield tunnel in China with external diameter 9 m through middle weathered rock, clay, sand and the interface of soil and rock. The geological and geotechnical condition in this tunnel is very complex. The main character of this project is large diameter shield tunnel, long distance construction in complex geological strata. The difficulties include tunneling construction method, longitudinal profile design, structure design, TBM selection and cutting head design, the treatment of tunneling through interface of soil and rock and boulders group. Through theory analysis and experience analogy, the safe and reasonable design scheme was demonstrated. Research conclusions：(1)The tunnel machine in this project adopt the mix-shield TBM, Shield tunneling method combines with New Austria Tunneling Method. The lining of the tunnel is combined type of universal segments lining and cast in concrete lining. It effectively solves the problem of long distance and under the sea tunneling. (2) The mix-shield cutter head design, boulders blast under the sea solves the problem of high risk and low efficiency speed of tunneling. (3)Through practice, it is demonstrated that this design can effectively solve the technical problems of subsea tunnel, and effectively control the construction risks, which can provide some references   for the related projects and future channel tunnels construction.
2015 Vol. 32 (4): 76- [Abstract] ( 2624 ) HTML (1 KB)  PDF  (843 KB)  ( 481 )
80 The Study of Culvert Type Selection in the Central and Southern Heavy Haul Railway Corridor in Shanxi Province
GUO Zhi-sheng, HUN Tie-lian, XUN Jia-lei
Abstract：Research purposes： The Central and Southern Railway Corridor in Shanxi province is the first heavy haul railway in China. Design live load adopts: standard railway live load specified by P.R.C(2005) HZ, load factor Z = 1.2. The topographic features are very different from Watang to Hongtong North. The South Lvliang Mountain tunnel is the boundary line, the railway line crosses many ravines to north of the South Lvliang Mountain, the railway line lies in the Fen River terraces with open terrain to south of the South Lvliang Mountain. Considering the weather, topography and other factors which are controlling culverts type selection, the article makes study of the structural type, building materials and engineering cost, brings forward the culvert type selection principle for the Central and Southern Railway Corridor. Research conclusions：(1) The statistical analysis of the whole culvert angle and height of filling showed that most of the culverts are high filled culverts, so it is necessary to make comparison study of the culvert type. (2) Through the comparison of culvert layout principle, it is clear that the slab culvert is suitable for the embankment where gully bed longitudinal slope is steep with large discharge, optimize the slab culvert construction material durability, meet the design requirements of heavy haul railway; Frame culvert is suitable for low embankment where the longitudinal slope is gentle within gully bed or flat plains, it has good entire structural performance and small amount of masonry. (3) By economic and technical comparison, and comprehensive consideration of culvert section rugged, culvert wear and frozen depth, frame culvert is suitable for the situation that upper filled soil is less than 6.0 m, or culvert section rugged height is less than 10 cm in flat terrain; In the area where longitudinal slope is steep within high mountain or deep groove terrain, slab culvert or ribbed slab culvert is recommended. (4) The research conclusions can provide references for the selection of the culvert type in mountain areas.
2015 Vol. 32 (4): 80- [Abstract] ( 2726 ) HTML (1 KB)  PDF  (417 KB)  ( 151 )
86 Analysis of the Karst Development Instance for Guiguang Pingshan Tunnel
LIU Jian-guo
Abstract：Research purposes： According to the karst phenomenon of the Guiyang to Guangzhou railway during exploitation and construction, this paper analyzes the development of karst and the particularity, then throws out the method of the geological survey and engineering measure of construction. It will have a certain reference value for survey and construction of similar geological condition project. Research conclusions：(1)The railway should avoid the karst strongly development areas. If the railway cannot avoid the karst area, it should be made as far as possible to the typical karst micro unit area. (2)We must be make full use of the regional geological data to develop the wide area geological investigation, and adopt the comprehensive geological method to survey the geological features of the tunnel, basically make a thorough investigation about the position, altitude and the relationship between the railway and the karst pattern etc., and design the exploration point and the part of the geophysical prospecting to check the phenomenon about the karst feature. (3) For karst tunnels nearby underground river, it is necessary to survey and research its space location characters, and analyze its original and features, than predict its impact on stability of surrounding rock of tunnel by analogy. (4) It is suggested to forecast the development of karst of tunnel by combining the methods of advanced forecasting of tunnel sidewall, geological radar of tunnel base and geological drilling hole of tunnel bottom during construction.
2015 Vol. 32 (4): 86- [Abstract] ( 4979 ) HTML (1 KB)  PDF  (449 KB)  ( 149 )
91 Analysis and Prediction of Geothermal Test for Long Tunnel Group on Xiangtang-Putian Railway Hot!
YIN Shi-qing
Abstract：Research purposes： High geothermal disaster was encountered during the construction of 4 deep-buried long tunnels of Daiyun Mountains tunnel group on Xiangtang-Putian Railway. A special method for original geothermal test in deep-buried long tunnel was proposed. And the accuracy of this method was verified through the comparison and analysis of the measured temperature of tunnel during construction with the ground temperature obtained by comprehensive logging prediction during the investigation. Research conclusions：(1)Through drilling horizontal deep boreholes, installing temperature test probes, grouting the deep borehole, geothermal testing and long-term observation, the original geothermal data were obtained. (2)The predicted maximum geothermal value was smaller and the geothermal range was narrower than the site observed values. (3) The geothermal gradient prediction values of deep buried tunnel in Fujian were about 3~4 ℃/100 m for the stage of prefeasibility and feasibility study, while 1.5 ~ 2 ℃/100 m should be increased for the stage of preliminary design and construction drawing stage. (4) The research results can improve the accuracy of geothermal prediction during the investigation and can be referenced for railway, highway and other deep buried underground engineering projects in East China.
2015 Vol. 32 (4): 91- [Abstract] ( 3082 ) HTML (1 KB)  PDF  (462 KB)  ( 168 )
96 Analysis of the Cooling Potential of a Passenger Lounge under Natural Ventilation in Northern China
MA Jiang-yan1, DENG Bao-shun1, QIAO Xuan-ming2, FENG Lian2
Abstract：Research purposes： In order to use the local climate resources maximally and reduce energy consumption of ventilation and air conditioning, on the base of the division of the cooling potential regions of the passenger lounge using natural ventilation in Northern China and evaluation criterion of thermal comfort in northern railway station under natural ventilation, Energy Plus soft is used to analyze the cooling potential of natural ventilation in the passenger lounge. Research conclusions：Results show that the passenger lounge in Northern China can be divided into four cooling potential regions under natural ventilation: (1)The cooling potential under natural ventilation is very high in Region I, and the utilization time of natural ventilation is more than 90%. (2)The cooling potential is also high in Region II, while the utilization time of natural ventilation is more than 85%. (3) The utilization time of natural ventilation is between 60% and 85% in the medium cooling potential Region III. (4) The utilization time of natural ventilation is less than 68% in the low cooling potential Region IV. (5) The results can optimize in the design of passenger station building natural ventilation and provide theoretical basis for practical engineering design.
2015 Vol. 32 (4): 96- [Abstract] ( 2614 ) HTML (1 KB)  PDF  (1528 KB)  ( 159 )
102 Research on the Oujiangbeikou Tunnel Project of Wenzhou City Region Railway S2
 
 Hot!
NING Mao-quan
Abstract: Research purposes Underwater tunnel as one of the important ways of railway, highway and other transportation passage across river has been used widely. Taking Oujiangbeikou tunnel project of Wenzhou city region railway S2 as an example, this paper studied the factors affect the tunnel site, such as geological conditions, control point alone the line, connection conditions of two banks, tunnel operation safety and so on, reasonably selected tunnel site scheme; aiming at the characteristics of this project, reasonably selected the form of tunnel section, disaster prevention and rescue scheme, which can provide a reference for similar underwater tunnel project.
 
Research conclusions：(1)Through comparing the difference of scheme of bit line between upstream and downstream in geological conditions, construction difficulty, operation period safety, control point alone the line, connection conditions, the downstream scheme of bit line was recommended with better geological conditions, lower constructed difficulty, less subsidence during the operation period, lower impact on the surrounding plan, which avoided the silt layer of bottom of tunnel, foundation piles of flood embankment and important buildings on the bank. (2)Analyzed the evacuation routes arrangement at domestic and foreign, and combining with features of the project, studied and used combination mode of setting transverse connection channel with special vertical evacuation routes + mid-partition. (3) Analyzed the uneven settlement caused by the complex uneven strata and thickness variation of deep soft soil which affect to the tunnel structure, shield tunnel with double lining structure was recommended. (4)According to the operator and field conditions, set the exhaust tract of tunnel, combined with the arrangement of evacuation routes, compared the tunnel section form of "single tunnel double track without mid-partition+ bottom evacuation routes", "single tunnel double track+the mid-partition" and "double tunnel double track", "single tunnel double track+ the mid-partition" was recommended with its better operation safety. (5)This paper mainly analyzed the tunnel disaster prevention of ventilation and smoke discharge, adopted the smoke exhaust modes of longitudinal ventilation and smoke discharge flue. To ensure personnel evacuation, guarantee that safe passage positive value was 30Pa, and control the smoke emissions direction of tunnel. (6)The research conclusion has significant reference for the construction of underwater tunnel project in the deep soft soil layer.
2015 Vol. 32 (4): 102- [Abstract] ( 3137 ) HTML (1 KB)  PDF  (1959 KB)  ( 484 )
109 Discussion on Frost Prevention and Thermal Insulation of Metro Water Pipes in Cold Region
LIU Xue-zhi, HU Zhe-rui
Abstract：Research purposes： Water supply and drainage system is one of the most important electromechanical systems which security affects the normal operation of the subway system, and affects the safety of life and property of the passenger and the country. In freezing regions of North China, water supply and drainage pipelines in the subway station are subject to injury by frost in winter, so as to affect the normal operation and safe use of the subway. This paper based on the analysis of factors of water pipes freezing in the subway station at the beginning of design, provides a safe and freliable solution of station water pipeline electric insulation design for the reference of those future projects. Research conclusions：(1) It is feasible to use the constant power electric tracing and insulation technology in the metro station entrance in cold areas. (2) The design of subway in cold regions need to be coordinated with the construction and environmental control system. Soil cover depth of station burying properly increasing and adding hot air curtain and other measures can improve the safety of water pipes antifreezing insulation. (3) Selection of materials of the pipeline thermal insulation should be the A-class non-combustible material in subway, adopts the double wire heating cable can improve the reliability of the system. (4) This research provides a model for control mode and the selection of electric insulation system of subway stations, and has a guiding role for the subway operation energy consumption analysis and cost control.
2015 Vol. 32 (4): 109- [Abstract] ( 2592 ) HTML (1 KB)  PDF  (427 KB)  ( 369 )
114 Exploration on the Location and Transfer Effect of Loop Line for Rail Transit
 
BI Hai-feng, CHENG Ming-ji, WU Qi-gang
Abstract：Research purposes： The loop line is a kind of the urban rail transit network. In this paper, through summarizing the urban rail loop link layout cases in domestic and foreign, the author analyzes the utility of loop link, focuses on the exploration of the theory on the transfer effect of the loop link in the city of chessboard type road network. It can help us to understand the rail transit loop link with a comprehensive view.
 
Research conclusions：The location of the urban rail transit loop link is closely related with the overall urban planning, city spatial form, city rail transit network forms. The interactive relationship of both contains three sides: (1) When the loop link is located in center of the city, it can help the CBD more powerful and prosperous.(2) When the loop link is located in outside of the city, it can help diverting the passengers who need come to the center.(3) In the city of chessboard type road network, the transfer effect of loop link is not better than the grid rail transit network. (4)The results of the research are conductive to enhance the rationality of rail traffic loop applications and can provide some references for the urban rail transit network planning.
2015 Vol. 32 (4): 114- [Abstract] ( 2704 ) HTML (1 KB)  PDF  (596 KB)  ( 95 )
118 Discussion on Misunderstanding and Implementation Principle of Railway BIM
HAN Yuan-li
Abstract：Research purposes： As phenomenon for inappropriate copinism and separatist on building BIM at present in railway industry, from professional view of information technology and spatial cognition, we revel the misunderstanding of railway BIM building which significantly different from architectural BIM. The concept of RIM is proposed to distinguish from BIM, and then we dissect its main features at different stages and put forward the basic construction principles for RIM. Research conclusions：(1) Essential difference hinder interoperability between BIM and RIM. RIM should build on digital earth space in order to guarantee consistency space and system integrity, only in this way can guarantee the full life cycle application and universal adaptability at all depth and breadth. (2) RIM's construction should follow the line steps of basic RIM platform→digital railway product→application standards→application RIM, do good top-level design to avoid unnecessary waste and orderly carry out the implementation of RIM. (3) In terms of its advantages on comprehensive technical and data resources, railway design enterprises have the best conditions to shoulder RIM platform construction and then bring forward total solutions and industry standards for RIM. (4) This research provides an active role in guiding the current hot RIM railway construction.
2015 Vol. 32 (4): 118- [Abstract] ( 2703 ) HTML (1 KB)  PDF  (400 KB)  ( 125 )
Copyright © Editorial Board of Journal of Railway Engineering Society
Supported by:Beijing Magtech