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2017 Vol. 34, No. 3
Published: 2017-04-15
Geology and Subgrade
Railway and Rail
Bridge Engineering
Tunnel Engineering
Research on Railway Networks
Urban Rail Construction
 
       Geology and Subgrade
1 Research on the Mechanical and Deformation Characteristic of Anchor Cable under Lateral Load
LI Jin - hua，ZHU Hai - xi，SONG Tao
Abstract : Research purposes ： With the rapid development of high - speed railway in the western region，it is inevitable to encounter a lot of slope anchor reinforcement engineering，which is due to the terrain and linear constraints. Because of the complex condition of the anchorage segment when the anchor cable passes through the slip surface of the slope，it needs to be further improved. Based on the double - parameter foundation model，the shear interaction between soil and rock was taken into account. A mechanical model of the anchorage segment under lateral load was established. Taking the reinforcement engineering of a loess slope as an example， the deformation law and stress characteristics of the Anchorage segment under different parameters were analysed. Research conclusions:(1) The calculating formulas were given，which was about the anchor cable deformation when The anchorage segment passes through the slip surface，bending moment，shear and the reaction of rock and soil mass. And computing method of loose zone of soil was also presented. (2 ) The results show that the shear and flexural stiffness have great influence on the deformation and stress of the anchor cable， which are mainly concentrated near the slip surface. (3) When the bending stiffness reaches a certain value，the shear displacement and the soil reaction decrease linearly with the bending stiffness. The shear displacement increases linearly with shear load. (4) The research results can provide reference for the design and construction of slope anchor cable reinforcement engineering on high - speed railway.
2017 Vol. 34 (3): 1-5 [Abstract] ( 2728 ) HTML (1 KB)  PDF  (713 KB)  ( 2577 )
6 Application and Analysis of Micropiles for Reinforcing a Expressway Cutting Slope Hot!
SUN Shu - wei1，ZHU Ben - zhen2，TAN Dong - sheng3
Abstract: Research purposes： The traditional anti - slide piles are constructed by manual excavation， with long construction period and large amount of concrete masonry. It is difficult to be used for rapid reinforcement of road cutting slopes. For this purpose， the drilled micropiles are adopted in the K51 cutting slope of Guangyuan - Bazhong expressway. The general situation and design parameters of micropiles reinforcement engineering are introduced，and the reinforcing mechanism of micropiles with cap beam is analyzed by a series of numerical simulation. Research conclusions:( 1) The thrust acting on the micropiles is approximately triangular distribution，and the thrust on each row of piles in the system is not uniform. (2) The action mechanism of each row of piles in the system is similar under lateral extrusion， and the peak value of shear force and bending moment slightly with different positions with boundary displacement. The model test and calculation results show that the failure modes of the reinforced slopes are the whole slip along the potential slip surface. (3) The results of bearing capacity analysis show that the ultimate anti - sliding force of the micropiles is greater than the designed value，which indicates that it is reasonable to use the micropiles to replace the original gravity retaining wall. (4) The research results can provide a useful basis for applications of micropiles in slope and landslide reinforcing in mountainous area.
2017 Vol. 34 (3): 6-10 [Abstract] ( 2858 ) HTML (1 KB)  PDF  (1317 KB)  ( 2548 )
11 Protection effect of Different Kinds of Sand - barriers along Lanzhou - Xinjiang High - speed Railway
LI Kai - chong，SHI Long，KONG Ling - wei，JIANG Fu -qiang
Abstract:Research purposes： Lanzhou - Xinjiang high - speed railway as the Chinas first high - speed railway across the wind area of Gobi desert，which inevitably meet a series of problems of sand - wind in the course of operation. In order to protect the safety of train operation，various sand control measures were built on both sides of railway which well played the sand prevention effect. Because the railway has the characteristics of long distance and large span，wind sand disaster appeared in some special sand control engineering area. Through observing the field experiment，the principles and effects of the different sand - blocking walls in sand - trapping are discussed，which will provide some technical support for the late design and construction. Research conclusions:( 1 ) There will be a disturbed zone in the back of the sand - blocking wall. The energy dissipation of the inclined plank sand - blocking wall is more efficient than that of the sand - blocking wall，vertical - type PE net sand barrier take the second place and the inserting - type concrete sand barrier was the poorest. (2) Negative correlations is discovered between the sand - blocking rate and the vertical height. Within 4 meters height，the sand ?blocking rate of the vertical - type PE net sand barrier ， the inclined plank sand - blocking wall ， the sand - blocking wall are about 85. 82; 60. 34; and 52. 92; (3) After through the sand - blocking wall, the composition of sand particle changes. The percentage of coarse particles in windward side sand flow increases, but the size of most sand particle are still between 0. 1 to 0. 25mm and 0. 25 to 0. 5mm. (4) The experimental results have guiding significance for sand prevention project for high - speed railway in the wind area of Gobi desert.
2017 Vol. 34 (3): 11-14 [Abstract] ( 2894 ) HTML (1 KB)  PDF  (738 KB)  ( 2488 )
       Railway and Rail
15 The Continuous - Slab - Track Coupling Laws between the Bridge and Track under Temperature Loads
CHEN Rong1，XING Jun1，XIE Kai - ze1，TIAN Chun - xiang2，WANG Ping1
Abstract : Research purposes ： The law of coupling interaction between bridge and track under temperature loads is the foundation to study CWR of CRTS II slab non - ballast track laid on bridge. In this paper，for the simply supported bridge and continuous bridge，the calculation model of multi - rails and integral bridges was built systematically. And rules and influencing factors of bridge - track coupling interaction were analyzed comprehensively and detailedly. Research conclusions:( 1 ) There is no obvious mapping relation between the rail expansion - contraction forces and beam layout. The rail expansion - contraction forces are symmetrical approximately，which is mainly determined by the longitudinal displacement distribution characteristics of the slabs. (2) The foundation plates are the key part of the bridge -track system. Its expansion and contraction affects the stress and deformation of the other parts in this system significantly. Terminal spines are the anchoring devices of foundation plates， and its stiffness directly decide the expansion and contraction displacements of foundation plates. ( 3 ) Affected by the relative displacement of the bridges and slabs， the longitudinal forces generated by sliding layer， 11 dual textiles" isolation layer or terminal spine would cause the change of longitudinal force of the foundation plate whose range is approximate to frictional or longitudinal force. (4) In the cooling conditions, bridge expansion - contraction has little influence on three - layer structure of rail - slab - foundation plate, but its fluctuation in joints is big. ( 5 ) The friction coefficient of sliding layer is extremely important and difficult to monitor in the track structure system，and increasing CA mortar adhesive force is good for the stress state of the track structure，so it is recommended to control the construction quality. (6) The research conclusions have certain guiding significance for the continuous - slab - track design theory optimization and engineering practice.
2017 Vol. 34 (3): 15-21 [Abstract] ( 3256 ) HTML (1 KB)  PDF  (1227 KB)  ( 2551 )
22 Research on the Bond Properties between Slab and CA Mortar and the Parameters Study of Cohesive Model Hot!
LIU Xue -yi，SU Cheng -guang，LIU Dan，XIANG Fen，GONG Chuang，ZHAO Ping -rui
Abstract:Research purposes： Now the contact loss between slab and CA mortar is the main damage type of Chinese CRTS II slab track，in order to figure out the damage mechanics of contact loss，the composite specimens of concrete and CA mortar were used to conduct the splitting tensile and shear test. The stress distribution of the interface was obtained with digital image technology ( DIC )， and then the parameters of cohesive model were achieved. The interface mechanical properties and failure mode between slab and CA mortar were obtained through comparing with the cohesive finite element model analysis results and the experiment results. Research conclusions:(1) The DIC technology can clearly describe the stress distribution of the composite specimens interface and its whole failure stage including the interface damage evolution，the formation and propagation of crack. (2 ) The bond failure between track slab and CA mortar is brittle fracture，and the interface normal stress - displacement and tangential stress - displacement are both bilinearity. ( 3 ) The cohesive model parameters between the track slab and CA mortar were recommended as follows： the normal cohesive strength is 1.792 MPa，the normal interface stiffness is 708. 485 MPa/mm，the normal critical fracture energy is 0. 025 2 mJ/mm2，the tangential cohesive strength is 0. 956 MPa， the tangential l interface stiffness is 63.039 MPa/mm，the tangential critical fracture energy is 0.018 mJ/mm2. (4) These results can be used to analyze the interface cracking behavior between slab and CA mortar，and provide theoretical basis for CRTS II slab track design and maintenance.
2017 Vol. 34 (3): 22-28 [Abstract] ( 3620 ) HTML (1 KB)  PDF  (2494 KB)  ( 2607 )
       Bridge Engineering
29 Research on the Shear - lag Effect in Twin - cell PC Box - girder with Corrugated Steel Web
WEI Xing，YANG Shi – yu
Abstract : Research purposes ： Because of different rigidity distribution，shear - lag effects in PC box - girder with corrugated steel web are different from that in PC box - girder. In order to investigate the shear - lag effects in twin - cell PC box girder With corrugated steel web，3 D finite element model of twin - cell PC box - girder With corrugated steel web was founded by means of ANSYS，and stress distributions on typical sections were obtained. Shear - lag effects of twin - cell PC box - girder with corrugated steel web were investigated，which is compared with the ordinary PC box girder. Seven geometric parameters affecting the shear - lag effect of box girder were analyzed. Research conclusions： (1 ) Using corrugated steel web can enlarge the maximum shear lag coefficient of each section slightly. (2) In term of the top flange，the shear - lag coefficient of the medium web is larger than that of both sides， contrary to the bottom plate. (3 )The width length ratio，the support length of the box - girder，and the thickness of the roof were confirmed as the main factor working on the shear - lag effect，and the shear lag was not influenced by the number of the diaphragms. (4)The research result are worthy of use for reference for design and analysis of PC box - girder with corrugated steel web.
2017 Vol. 34 (3): 29-33 [Abstract] ( 3335 ) HTML (1 KB)  PDF  (707 KB)  ( 2529 )
       Tunnel Engineering
34 Research on the Dynamic Process Simulation of Rock Grouting Based on Particle Flow
GENG Ping1，LU Zhi - kai1，DING Ti1，QUAN Qian - long2，YAN Qi - xiang1
Abstract:Research purposes: Water outburst and mud outburst is easy to happen in tunnel excavation of the rich water area. Grouting is an effective preventive measure. According to the particle discrete element method，this paper studies on the influence of grouting on tunnel in water rich area. Based on the dynamic simulation of the grouting process，this paper studies the grouting effect under different grouting pressure and grouting arrangement. The conclusions can provide reference for optimizing grouting arrangement. Research conclusions:(1) Grouting pressure determines the grouting diffusion model. The penetration grouting turns to the splitting grouting while grouting pressure increasing. (2)It is verified that splitting grouting is a process of compaction， splitting，re - compaction and re - splitting. ( 3 ) It is quite difficult for the slurry to enter into the center of the grouting hole when porous grouting. (4) Based on the research of this paper，the effect of splitting grouting is better than that of penetration grouting. Splitting grouting can be used in tunnel project. Porous grouting may not always work. According to geological conditions，reasonable arrangement of grouting holes and grouting sequence is essential. It is necessary to avoid the weak rock points in the center of the hole grouting. (5) The research results can provide the reference for the layout principle of grouting hole and grouting quality control in the weak strata.
2017 Vol. 34 (3): 34-40 [Abstract] ( 3424 ) HTML (1 KB)  PDF  (2019 KB)  ( 2593 )
41 Study and Application of the Surface Vertical Grouting Technology on the Railway Tunnel Hot!
ZHANG Min - qing1，SUN Guo - qing2，PENG Feng2
Abstract : Research purposes ： Grouting is important auxiliary measures of dealing with weak surrounding rock and groundwater in underground engineering construction，mainly hole - pre - grouting more in the tunnel construction，this method is time - consuming and high - cost，has a greater influence on the other normal process. By studying the surface vertical grouting design，material，process，inspection evaluation methods and standards，this method is applied to the engineering practice，good results have been achieved. Research conclusions：( 1) Compared with hole - pre - grouting in whole section，the surface vertical grouting has low difficulty of pore forming，more practicable grouting process，higher grouting reliability and little grouting effect on the hole excavation， at the same time， when tunnel excavation is abnormal， can be tracked by the surface grouting reinforcement. Taken together，under the ground conditions allow，the surface grouting has more advantages than of the hole - pre - grouting in whole section，high promotion value . (2) Under normal circumstances，when the tunnel buried depth is below 30 ?40 m，the surface vertical grouting cost of the hole - pre – grouting lower than the cost in whole section，grouting diffusion radius( grouting hole spacing) has a greater influence on the cost，the grouting combined with different project，can be taken to optimize the design of the grouting parameters，taking the surface vertical grouting construction, reduce the cost. (3) The research results can be applied to the tunnel grouting construction.
2017 Vol. 34 (3): 41-45 [Abstract] ( 2747 ) HTML (1 KB)  PDF  (881 KB)  ( 2519 )
46 Back Analysis on Deformation and Failure Zone Distribution Laws of Surrounding Rock in Deep - buried Soft Rock Tunnel
YU Yuan - xiang1，CHEN Bao - ping1，ZHANG Tao2，ZHANG Jie1
Abstract ： Research purposes ： Liutongzliai tunnel is the critical engineering of the new railway line from Chengdou to Lanzhou，whose large deformation problem is very prominent， while there is no perfect calculation method for the deformation prediction of the deep tunnel surrounding rock on the condition of rock rheology. Based on the summary of existing research results of surrounding rock deformation，the surrounding rock of the tunnel was simplified as an elastic plastic medium，in which full - column anchor bolts have been laid. This paper analyzed the surface friction and axial force distribution law of the bolt body by the coordination function principle between surrounding rock and bolt and the maximum axial force value of bolt neutral point was derived according to the static equilibrium condition. On this basis， the formulas about the radius of plastic zone and loose zone after the surrounding rock deformation ceased were proposed. Finally，it determined theoretically loose zone and plastic zone range of Liutongzhai tunnel surrounding rock， which provided important technical support for optimization of surrounding rock support scheme as well as parameters. Research conclusions ：( 1) In engineering practice ; rock rheology is the basic reason for the deep - buried tunnel large deformation. Generally speaking, the surrounding rock tends to stabilize after a period of initial bolting support. (2)The surrounding rock and bolt body deform coordinately. The interface of the positive and negative friction on the bolt body surface is neutral point, on which the relative displacement between bolt and surrounding rock as well as surface friction is zero, while the axial tensile force reaches the maximum. ( 3 ) The stable plastic zone and loose zone range of the surrounding rock can be analyzed conversely making use of maximum axial force of bolt body, whose size decreases with increase of the cohesion and internal friction angle of rock mass and enlarges with increase of tunnel radius. It has little relationship with the support resistance. (4) Field application results show that deformation zone distribution laws of the tunnel surrounding rock may be analyzed back on the basis of known bolt axial force. The research findings can be used for reference for safe and rapid construction of similar tunnel engineering.
2017 Vol. 34 (3): 46-52 [Abstract] ( 2869 ) HTML (1 KB)  PDF  (1451 KB)  ( 2458 )
53 Calculation and Verification of Safety Rock Thickness for Preventing Gas Outburst in Tunnelling Hot!
XIEXian - guang，GOU De - qiang，CHEN Cheng – jun
Abstract :Research purposes： Tunnel；ling in a potential gas outburst section exhibits high safety risk. The determination method of safe rock thickness has become a key technical issue to avoid construction risk and improve construction efficiency. At present，the determination of safe rock thickness mostly depends on experience with more randomness，so it should be further studied and improved combining geotechnical theory with construction practice. Research conclusions ：( 1) According to the theoretical geotechnical analysis，numerical simulation research for similar projects， and combining the gas outburst prevention practice in existing tunnels， a simple calculation method of minimum safe rock thickness for preventing gas outburst is proposed. The method is proposed by taking gas pressure and engineering geological conditions as the representative indexes. (2) By using several typical engineering examples，the feasibility of the calculation method is verified. (3 ) The research results will play a direct guiding role in ensuring the tunnel construction safety and improving the construction progress in potential gas outburst zones， which can provide important reference for scientific determining the safety rock thickness in potential gas outburst zones.
2017 Vol. 34 (3): 53-57 [Abstract] ( 3397 ) HTML (1 KB)  PDF  (745 KB)  ( 2452 )
58 An Energy Analysis Approach for Seismic Characteristics of Crossing - fault Tunnel
QU Hong - lue1，LUO Hao1，LIU Hui2，LIU Ying1，ZHAO Han - bin1
Abstract : Research purposes ： Crossing - fault tunnel is easy to damage under ground motion. In the process of deformation to destruction for tunnel， energy absorption and release were accompanied. Therefore， in order to understand the seismic damage behavior of the crossing - fault tunnel，an approach of energy release rate was used to study the characteristics of seismic damage of tunnel influenced by crossing - fault. In addition，a numerical simulation of the tunnel was established，and the applicability of energy analysis approach was verified. Research conclusions:(1) Under the action of coupling fault movement and earthquake，the seismic response of the spandrel，haunch，and arch springing of tunnel is bigger than that of the vault and arch bottom of tunnel. (2) Under the action of coupling fault movement and earthquake，the position of stress concentration does not change with the change of fault width. With the increase of the width of the fault，the scope of energy release and stress concentration is gradually enlarged while the seismic action in fault location is gradually weakened. (3 ) Based on the dynamic response curve，the plastic yielded zone and the core seismic fortification length of tunnel can be identified. (4) Energy analysis method can be used to analyze the seismic behavior of tunnel and provide reliable basis for the tunnel seismic fortification.
2017 Vol. 34 (3): 58-62 [Abstract] ( 2791 ) HTML (1 KB)  PDF  (1216 KB)  ( 2467 )
       Research on Railway Networks
63 Research on the 3 D LOD Model for Railway Station Based on OSG Hot!
PU Hao1，LUO Shi - xiao2，LI Wei1，LUO Hong - wei3
Abstract：Research purposes： The realization of 3D visualization model is an important part of BIM . Areal - time 3D model can increase the accuracy and provide a reference for the results in the design of station. How to organize the data on the base of large amount of equipment and the complicated situation and quickly generate a real - time 3D visualization model to adapt to the requirements of the design stage and the smooth scheduling is the difficulty in the creation. Research conclusions:(1) The method of constructing hierarchical three - dimensional station model is proposed，and the problem of long loading time and demanding hardware for large data is solved. ( 2 ) A reasonable data management structure is proposed，and the modeling method independent of design data is established. ( 3 ) Based on this method， complete the platform structures of three - dimensional station scene. The platform can achieve rapid modeling，dynamic loading and interactive browsing， which significantly improves the work efficiency. (4) The results can be widely applied to three - dimensional modeling and three - dimensional hierarchical scene management of roads，tunnels，water conservancy and other engineering fields.
2017 Vol. 34 (3): 63-67 [Abstract] ( 2866 ) HTML (1 KB)  PDF  (746 KB)  ( 2520 )
68 Prediction of Vibration Response of Neighboring Constructions Based on Excitation of a City Metro
ZHENG Guo - chen1，QI Ai2
Abstract ： Research purposes ： The metro is under construction in a city，in order to get credible prediction accuracy for vibration response of neighboring constructions with this city metro，it is necessary to develop systematic research on environmental vibration along this city metro with comparatively special geological condition. Accordingly，two subsystem model，the vehicle - track coupled model of vertical vibration and the tunnel - soil - construction models of 3DFEM are established base on third kind of soft soil site of this city. Vibration responses of neighboring constructions are predicted reference to the parameters of this city metro. Research conclusions:( 1 ) Vibration responses of neighboring constructions mainly reflect structural self - vibration， while there are rebound zones of middle - high frequency in the low levels of the constructions. (2) Train speed and single - double track have significant effects on peak acceleration，but have no significant effect on the vibration shape of the constructions. ( 3 ) The horizontal distances from multistoried construction to the centerline of the two tunnels is within 5 m，middle – high rise and high rise constructions are within 10 m，or range from 30 m to 40 m in vibration amplification zone， or the metro train speed is over 60 km/h，the floor accelerations of constructions may surpass vibration limit of related specification; so further vibration control is required to apply. (4) The relevant research results can provide a theoretical and technical support for design, construction and vibration control of metro environmental system on this city or geological condition similarities.
2017 Vol. 34 (3): 68-73 [Abstract] ( 3390 ) HTML (1 KB)  PDF  (918 KB)  ( 2527 )
       Urban Rail Construction
74 Research on the Spatial Distribution and Statistical Characteristic of Ground Settlements in Metro Station Construction
LI Wei - ming1，LIU Yu - ye1，SHI Xu - dong2，DING Jing - wen2，WU Zheng2，JIANG Yi3
Abstract : Research purposes ： The factors of the ground surface settlements due to metro construction are difficult to calculate based on the general theory， and the monitoring becomes one of the most important methods for engineering decisions. It is necessary to explore the spatial distribution and statistical characteristics based on the monitoring data， which could be helpful to the other similar engineering both in theory and in practice. Research conclusions:( 1 ) The ground may upheave to 10-25 mm during the mixing pile execution in metro construction. (2) The ground settlements were significantly during the metro station excavation. The maximum settlements occurred on the section of 0. 3 ~ 0. 9 times of the foundation pit depth，and were perpendicular to the long edge of the excavation. The results are some similar to the other researches，but seem to be a little scatter. (3) The position interval of the settlement maximums is [0.50, 0.73] of the excavation depth according to the statistical characteristic of the monitoring data，and the mean，the median，and the mean square error is 0.65，0.64 and 0.11 correspondingly. The area of the maximums should be monitored and assessed with particular attention. (4) The settlement maximums of the complex shape section may deviate from the statistical interval, and the construction in the area should be investigated and optimized carefully in the schemes. (5) The results are helpful for the design and construction in metro engineering.
2017 Vol. 34 (3): 74-79 [Abstract] ( 2869 ) HTML (1 KB)  PDF  (1083 KB)  ( 2554 )
80 Analysis of Metro Shield Construction Parameters Time Series Based on Complex Networks in Metro Construction Hot!
ZHOU Cheng，ZHANG Han -tao
Abstract:Research purposes ： Metro shield construction is a complex process， geological conditions have a major impact on the shield parameters. For the purpose of study the effect of geological conditions on the parameters of the shield，considering the stratums surrounding a certain section of a city tunnel， and the parameters that in different geological conditions were converted into a complex network，this paper studied it from microscopic and macroscopic， analyzed the evolution of the various parameters of the shield under different geological conditions. Research conclusions: (1) Verify the feasibility that transform shield parameter time series into complex networks; (2 ) In different geological conditions interchange，parameters network ( s node degree significantly increased，indicating that the shield system has greater volatility;( 3 ) Lithostratigraphic stratum is more stable than sand formations，and gas compartment pressure is more sensitive to changes in the outside world， can be used to monitor the stability of the system；(4)This study can provide support for the formation identification.
2017 Vol. 34 (3): 80-86 [Abstract] ( 2764 ) HTML (1 KB)  PDF  (1759 KB)  ( 2455 )
87 Research on the Key Technique of Subway Station Design with Hole - pile Method under Complex Environment
WANG Ming – sheng
Abstract : Research purposes ： According to the area environment characteristics of Beijing and process characteristics of hole - pile method，this paper aims at the construction shaft setting mode，cross channel setting mode，pilot tunnel design，steel pipe pile design，buckle arch design for a systematical study of hole - pile method，further explores the hole - pile method application of boundary conditions in terms of design，further researches to explore the key technology and key measures in design and construction of beijing subway station， sums comprehensive technical guidance of the hole - pile method up，in order to provide a reference for future similar metro engineering construction. Research conclusions:(1) The main idea of hole - pile method is forming vertical bearing structure as soon as possible. (2) Hole - pile method has the advantages of flexibility，good adaptability，which is suitable for the undercut subway station construction under complex environment. ( 3 ) Systematic research of hole - pile method design and construction is hysteretic，which needs to be further researched. (4) The results of this paper can provide reference for the subway station design with hole - pile method under complex environment.
2017 Vol. 34 (3): 87-92 [Abstract] ( 3770 ) HTML (1 KB)  PDF  (838 KB)  ( 2549 )
93 Analysis of Seismic Response and Parametric Sensitivity of Subway Station Surrounded by Saturated Soft Soil
CUI Chun - yi1，CHENG Xue - lei1，SUN Zong - guang1，XU Cheng - shun2
Abstract : Research purposes : For the aim to further discuss the seismic response and failure mechanism of interaction system of subway station in saturated soft soil，and investigate the effects of the parameter variation of soft soil properties typical dynamic response indices including excess pore pressure ratio and structural internal forces， both numerical computation and corresponding parametric analyses are conducted by using the dynamic method of two - phase porous media and the method of multi - index comprehensive balance，which can provide reference for the understanding of disaster mechanism and seismic design of subway station in saturated soft soil ground. Research conclusions :( 1) There is an annular peak zone of dynamic pore pressure near the floor plate and the subsoil moves from two flanks which leads to the uplift of subway station. (2) The middle floor plate，underpart of shear wall and middle column are weak parts during seismic action. (3) Cohesion of soft soil is the most sensitive soil parameter to typical dynamic response indices and reference bulk modulus takes the second place. ( 4 ) The research results can be employed for guiding the seismic design of subway station surrounded by soft soil.
2017 Vol. 34 (3): 93-98 [Abstract] ( 2935 ) HTML (1 KB)  PDF  (1748 KB)  ( 2526 )
99 Techno - economic Analysis of Low and Medium - speed Maglev Transport Hot!
XIAO Fei
Abstract:Research purposes: The Changsha Maglev Express starting trial operations on May 6th 2016 is China’s first and also the world’ s third low and medium - speed maglev line that has been put into commercial operation. Its successful opening has not only attracted wide attention from the society as a whole，but also rendered low and medium -speed maglev transport a new hotspot for investment in urban rail transit. It requires serious consideration of all parties concerned to ensure scientific investment decisions. This paper conducts a comprehensive research on technical features and economic efficiency of low and medium - speed maglev transport through a comparative analysis between it and traditional wheel/rail transport. Furthermore，the paper analyzes the environment it applies to and predicts its prospect for development for the reference of decision - makers concerned. Research conclusions： From the analysis of technical features and economic efficiency of low and medium - speed maglev transport，the following can be concluded ： ( 1 ) It offers comfortable travel experience and is environment - friendly. It is also characterized by strong line adaptability，high safety， and low maintenance. (2) Its shortcomings include small traffic volume， relatively unfavorable connectivity， low overload capacity， relatively high energy consumption，and relatively high construction cost per unit transport capacity. (3) In contrast to traditional wheel rail transport，it has very limited market space. (4) These results have guiding significance for relevant practitioners engaged in the low and medium - speed maglev transport industry，project investment decision - making，and technical and economic comparison.
2017 Vol. 34 (3): 99-105 [Abstract] ( 2820 ) HTML (1 KB)  PDF  (1031 KB)  ( 2561 )
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