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2014 Vol. 31, No. 12
Published: 2014-12-20
 
1 Geological Route Selection of Tunnel Group through #br# Wuling Mountain on Qianjiang-Zhangjiajie-Changde Railway Hot!
LI Jin-cheng
Abstract：Research purposes：The karst geological disaster is the important controlling factor in geological route selection of tunnel group through Wuling mountain on Qianjiang-Zhangjiajie-Changde Railway. This paper took tunnel group project of Qianjiang-Zhangjiajie-Changde Railway as an example, determined a relatively reasonable route solution for tunnel group through Wuling mountain by comparing and analyzing different solutions from karst disaster, project risk, setting conditions, investment, etc.
Research conclusions：We have proposed three solutions for tunnel group through Wuling mountain on Qianjiang-Zhangjiajie-Changde Railway: south solution (D14K), middle solution (DK) and north solution (D12K). Through comparing and analysis, we have made the following conclusions: (1) D12K could be relatively less damaged by karst disaster and the project risk is lower. (2) In view of the project setting condition, the three engineering setting conditions are similar. (3) In view of the project investment, the costs of DK and D12K are 26.362 million and 56.863 million CNY higher than D14K respectively. However, the solution of D14K could be seriously damaged by karst disaster and the project risk is higher. (4) A shorter tunnel group through Wuling mountain could be designed by the north solution (D12K) and project setting is modest. Although the investment is slightly higher, such solution could be less damaged by karst disaster and the project risk is lower. As a result, such solution (D12K) is the best solution. (5) The research could provide a reference for optimizing tunnel geological route selection in karst region in the future, to reduce project investment and risk, ensure project security.
2014 Vol. 31 (12): 1-6 [Abstract] ( 2605 ) HTML (1 KB)  PDF  (421 KB)  ( 147 )
7 Research on the Methods of Railway Second Line Plane Automated Design#br#
KONG Guo-liang，LI Ding-feng
Abstract：Research purposes： In the railway second line plane design, it may cause these problems by different methods, such as the distances between centers of lines are not same and no good to maintenance and repair in unchanging distances range, and the distances are too much to waste area in changing distances range. It involves a number of calculation and creating the drawing and table, and the operation is complicated. Therefore, this paper puts forward a set of general and feasible method about railway second line plane automated design, which improves the design efficiency.
Research conclusions：(1) Use strictly concentric circles method in unchanging distances range to ensure the least land and the distances between centers of lines are equal everywhere. (2) According to the distance control of ZYN and the head and tail change of curve area calculated second line curve data in changing distances range, to ensure the distances between centers of lines gradual transition and economize land. (3) Designed the program and simplified the operation, it could realize the functions by one step, included all curves widen design, second line curve data calculation, internal broken chain calculation, creating the table and the second line plane drawing, which significantly improved the design efficiency. (4) Simplified the formulas deducing by using coordinate analytic method, and improved the calculation accuracy and algorithm generality by using numerical calculation method. (5) This research result can provide reference for the plane design of all levels of newly built double-line railway, increased built second line and rebuilt existing line.
2014 Vol. 31 (12): 7-12 [Abstract] ( 2713 ) HTML (1 KB)  PDF  (523 KB)  ( 137 )
13
Research on the Engineering Construction Geological Condition of Qingdao Jiaozhou Bay Tunnel
Research on the Engineering Construction Geological Condition of Qingdao Jiaozhou Bay Tunnel[J]. 铁道工程, 2014,31(12): 13-17')" href="#"> MA Ruo-fei
Abstract：Research purposes： With regard to the characteristics of Qingdao Jiaozhou bay tunnel construction, such as large-span cross-section, great difficulty in construction, complex geological conditions, uncertainty of the construction influencing factors, high risk,this paper researches and analyzes the impact of fault, water bursting, surrounding rock classification change on construction, to ensure the security of construction and provide scientific basis.
Research conclusions：(1) Jiaozhou bay tunnel structure and fissure water distribution can be different affected by uncertain factors. (2) Found out the reasons of possible differences by research and analysis of specific location and characteristics of tunnel fault: mistaking fault azimuth angle for strike azimuth angel which leads to anomalies of strike and propensity distortion in regional structure. (3) Based on the research of change data of surrounding rock, map the proportion change in surrounding rock classification diagram, to intuitively reflect the variation trend of surrounding rock classification before and after the construction: the proportion of Grade Ⅲ surrounding rock has been changed from 53% to 29%, the proportion of Grade Ⅳ surrounding rock has been changed from 28% to 58%, the proportion of Grade Ⅴ surrounding rock has been changed from 10% to 4%. (4) The research can be applied in carrying out the engineering geological fieldwork, implementing dynamic design and guaranteeing the quality, time limit, safety and project investment control during tunnel construction.
2014 Vol. 31 (12): 13-17 [Abstract] ( 4908 ) HTML (1 KB)  PDF  (471 KB)  ( 172 )
19 The Regional Geostress Characteristics Analysis and Application in Dangjinshan Tunnel #br# Hot!
ZHANG Wen-zhong
DOI: 中图分类号：TU42 文献标识码：A
Abstract：Research purposes： The Dangjinshan Tunnel of Dunhuang-Golmud Railway, is located in the Altyn fault system which is between Xing-Meng fold   system and Qilian Mountain fold system. The tunnel with high buried depth will encounter a series geological problems such as high geostress, complex geological condition, etc. Through studying the geostress characteristics in this region, the geological problems related to the high geostress can be analyzed and predicted in the tunnel construction. 
Research conclusions：(1) The tunnel is located in the region with high geostress and the horizontal stress is the maximum principal stress. (2) According to tangent stress principle, the slight rock burst would  happen along the deeply-buried sections with integrate mica-quartzose schist or granite and scarcely happen along the sections with chlorite-schist. (3) Based on analysis of the geostress and lithology characters, the large deformation may happen in the fault fracture zone (especially F5) with soft rock and in other regions the deformation may not happen. (4) The geostress analysis, evaluation method and analysis of engineering geological problems introduced by high geostress in the paper have reference significance for other tunnel construction.
2014 Vol. 31 (12): 19-22 [Abstract] ( 3218 ) HTML (1 KB)  PDF  (489 KB)  ( 116 )
23 Exploration on the Influence Scope of Ground Settlement due to Pumping Groundwater#br# #br# Hot!
LI Guo-he1，ZHANG Jian-min2,ZHANG Ga2，HUANG Da-zhong1
DOI: 中图分类号：P642.5 文献标识码：A
Abstract：Research purposes：Groundwater exploitation is the main cause of land subsidence, and the uneven settlement caused by centralized pumping is serious harm to high-speed railway projects. In this paper, the process of foundation deformation caused by the wells pumping is studied, and the extent of ground settlement is estimated reasonably, aiming to guide the railway line selection and take reliable preventive measures.
Research conclusions：（1）Based on the results of centrifuge model tests, numerical simulation method was established accordingly to simulate the behavior and extension of ground settlement due to exploiting groundwater at different depth. The results show that the deformation of soils decreases with increasing distance from the well. The settlements and their difference due to pumping groundwater decrease with increasing number of exploiting cycles.（2）At the center district of land subsidence and vicinity of the well, the asymmetry subsidence is more serious with exploiting groundwater at a shallow depth, and its extent is narrower than that exploiting groundwater more deeply.（3）The influence extent of foundation deformation caused by steady flow pumping of the single well in confined water is negatively related to the permeability coefficient and positively related to the production, then its deformation influence range can be controlled if the pumping rate has been effectively controlled, and it is generally not more than 1000m.（4）When the high-speed railway through the region of land subsidence prone to take around, the multiple measures  should be taken to avoid uneven settlement， such as bypassing centralized pumping region, closing well, limiting the production and controlling the amount of groundwater exploitation.（5）The research results can provide references for line selection of high-speed railway and subsidence control in land subsidence region.
2014 Vol. 31 (12): 23-27 [Abstract] ( 2715 ) HTML (1 KB)  PDF  (373 KB)  ( 205 )
28
Research  on  the Estimation of Ultimate Bearing Capacity of Bored Cast-in-situ Pile by Rotary Penetration Test
 
Research  on  the Estimation of Ultimate Bearing Capacity of Bored Cast-in-situ Pile by Rotary Penetration Test
 
[J]. 铁道工程, 2014,31(12): 28-32')" href="#">		 CHEN Xin-jun, GAO Jing
DOI: 中图分类号：TU413.9 文献标识码：A
Abstract：Research purposes：The rotary penetration test (RPT) is a new technology of in-situ tests. The aim of the research is to explore the application on the design of bored cast-in-situ pile with the rotary penetration test, of which the method design, the equipment development and the field test of RPT have been completed. Through the comparative analysis between the results of RPT and the internal force test of pile, the estimation of ultimate bearing capacity of bored cast-in-situ pile by RPT is studied.
Research conclusions：In this paper, one parameter——the specific energy of RPT is defined and used in the following comparative analysis. The calculation method of the ultimate bearing capacity of bored cast-in-situ pile is presented and corrected through the comparative analysis between the results of RPT and the internal force test of pile. The project example proves that the calculation method could efficiently calculate the ultimate bearing capacity of bored cast-in-situ pile.The research results can give reference for pile foundation design, at the same time have guidance and reference for application of RPT new technology in geotechnical engineering.
2014 Vol. 31 (12): 28-32 [Abstract] ( 2709 ) HTML (1 KB)  PDF  (401 KB)  ( 103 )
33 Application Research on the Bag Reinforced Grouting Pile on    Reinforcement of Soft Ground #br#
LI Yang-bo
DOI: 中图分类号：U213.1+5 文献标识码：A
Abstract：Research purposes：
During the rebuilding lane close to existing railway, restricted by the driving interference and limitations of construction site and catenary headroom, reinforcement of soft ground is a difficult problem. Therefore, it needs a rational technology which  can  not only able to meet the limited space and subgrade settlement control requirements,but also ensure the existing railway safely operate.
Research conclusions：Bag reinforced grouting pile is a new technology using a combination of grouting technology, geotextile fabric and reinforced materials. The main advantages are followings: (1)The isolation of geotextile bag can make slurry to expand bag and compact soil. Reinforced grouting pipe as grouting channel not only simplifies the construction process，but aslo greatly enhances the shear strength and resistance deformation. (2)Construction uses the ordinary rotary drilling rig which has many advantages, such as appropriate adjustment according to the site, small footprint range, lower limitations of space and headroom. (3)The method of returning slurry from the hole bottom is adopted to construction by sub-section injection, repeatedly supplementary slurry, which can better ensure the pile quality. (4)The test results show that the bag reinforced grouting pile can not only ensure the shear strength and capacity, but also adapt the limitations of construction site and space and headroom, it can be widely applied in the reinforcement of soft ground.
2014 Vol. 31 (12): 33-36 [Abstract] ( 2602 ) HTML (1 KB)  PDF  (664 KB)  ( 124 )
37 Alarm System Study of Rockfall Based on FPSS
TAN Dong-sheng1， HONG Zheng2，CHEN Yu-fei3,YAO Wei1
Abstract：Research purposes：
The accidents of rockfall collapse abound along the railway, it has become more and more important how to ensure the safe operation of the railway. In view of this situation, there is an urgent need to develop a set of automatic monitoring system which meets a variety of conditions in the high-risk sections along the long-term observation, automatic discovery of railway obstacle, and can provide early warning for passing trains. This paper applied FPSS(Fiber Perimeter Security Systems) to realize the vibration analysis and alarm function of passive network rockfall along the railway.
Research conclusions：1)Systematic development using FPSS optical fiber sensing technology, can be used successfully forvibration analysis and alarm of railway passive network rockfall, which have real-time, all-weather, unattended monitoring of passive rockfall network along the railway, to guarantee the safe operation of the railway. (2) The successful design of the system has realized  the rockfall vibration signal acquisition of passive railway network, signal interference demodulation, signal acquisition, signal analysis and processing of the whole process. (3) The application of engineering examples show that the effect is good.（4）The research results can be applied to rockfall alarm of railway and highway.
2014 Vol. 31 (12): 37-40 [Abstract] ( 2702 ) HTML (1 KB)  PDF  (694 KB)  ( 131 )
41 Research on the Synthetic Resin Sleeper Track Structure on Large Span Steel Bridge in High Speed Railway#br#
YANG Ji-zhong, YAN Hua, LIN Hong-song, PAN Zi-li
DOI: 中图分类号：U213.2+43 文献标识码：A
Abstract：Research purposes：In order to study the feasibility on the application of the synthetic resin sleeper on the large span steel bridge in high-speed railway, the finite element method is used to establish the track model with synthetic resin sleeper. According to the requirements of the rail's displacement, stress, bending moment, installation space for fasteners, and connection space for sleepers and bridge, the height, width, length, bearing spacing and cushioning stiffness of the synthetic resin sleeper are analyzed, the reasonable parameter values are proposed for the synthetic resin sleeper installed on the large span steel bridge in high-speed railway.
Research conclusions：The sleeper width depends primarily on its economy and installation space for fasteners, 200~300 mm width can meet the track's mechanical requirements. The sleeper height has a great effect on the sleeper bending stress. In order to ensure the sleeper reliability, it is suggested to take a 210 mm height sleeper or more. The lateral space between fulcrums of the resin sleeper has a great effect on track stiffness, sleeper bending moment, and dynamic gauge enlargement, so the fulcrums should be as close as possible to the rail centerline in order to avoid sleeper fulcrum force in the overhanging portion between the two fulcrums. The cushion stiffness has a great effect on the track vertical displacement. In order to control the track's vertical displacement, the cushion stiffness should take 750 kN/mm or above. The research results can be used in structural design of light rail on the large span bridge of high speed railway, to provide a reference for similar projects.
2014 Vol. 31 (12): 41-45 [Abstract] ( 2586 ) HTML (1 KB)  PDF  (598 KB)  ( 182 )
46 Analysis and Study of Train-bridge Coupling Dynamic  of Anti-curve Railway Bridge System#br#
ZHENG Xiao-long
DOI: 中图分类号：U24 文献标识码：A
Abstract：Research purposes： When the railway bridge is designed in an anti-curve, it should be fully demonstrated according to the requirements of the relevant regulations. This paper took a station expansion project by the anti-curve railway bridge terrain conditions design as an example, using MSC.PATRAN and ADAMS/RAIL analysis software，built a complete three-dimensional model of bridge and train, analyzed the train-bridge coupling vibration about CRH1 bullet train through the anti-curve bridge under different speed conditions． 
Research conclusions：（1）Through analyzing of the calculation results, such as the displacement and acceleration of bridge，derailment coefficient, reduction rate of wheel, acceleration and sperling index，we can draw the following conclusions:  when the CRH1 bullet train running with 70~90 km/h speed through the anti-curve railway bridge, the train's derailment coefficient and reduction rate of wheel increases as the train speed rises, the bridge's vertical and lateral vibration displacement is small, the bridge's vertical and lateral vibration acceleration is less than the specified limit.（2）The anti-curve bridge has enough vertical and lateral stiffness for the train running safety and the passenger riding comfort.（3）The anti-curve bridge scheme designed due to topographical condition is feasible. (4)The research results can provide good references and guidances for the study of train-bridge coupling vibration of anti-curve of railway bridge.
2014 Vol. 31 (12): 46-51 [Abstract] ( 2749 ) HTML (1 KB)  PDF  (684 KB)  ( 141 )
52 Prestressed Concrete Skew Continuous Box Girder Design#br#
TU Yang-zhi
Abstract：Research purposes：Gongrong Road across Loudi-Shaoyang Railway in Loudi city uses （25+40+25）m prestressed concrete skew continuous box girder, oblique angle is 55 °, and uses support cast-in-place construction method. Because the bridge wide is larger and oblique angle is also larger, this article uses the space grillage and plane single beam two methods of finite element analysis to contrast and analyze the prestressed concrete skew continuous girders.
Research conclusions：(1) For the convenience of prestressed concrete skew continuous girder design, it is recommended to adopt the single beam method for design, space grillage method for validation. (2) The most-positive bending moment and fulcrum negative bending moment of large angle of skew continuous beam are smaller than the moment of right bridge under the action of a constant load, but the shear lag effect is obvious better than orthogonal box girder, the design must fully consider the shear lag effect. (3) Skew continuous beam obtuse angle sides support reaction force is bigger than acute angle sides support reaction by about 15%, the design pay special attention to the choice of the bearing and the lower structure design. (4) To increase the lateral stiffness between the box offices, it is suggested that in side span and midspan set  several horizontal clapboards. In order to eliminate the phenomenon of stress concentration, the two chamfering can be used to avoid acute angle appear. The whole girder body recommends prestressed structure design, and the ordinary reinforcement of girder body is strengthened properly. (5)In this paper, the conclusions can provide the reference for the design of large span prestressed concrete skew continuous girder bridge.
2014 Vol. 31 (12): 52-56 [Abstract] ( 2666 ) HTML (1 KB)  PDF  (737 KB)  ( 122 )
57 Design and Study of the Station Rail Beam and Platform Beam Integrated Structure Hot!
PENG Hua-chun, ZHAO Zhi-jun, DU Zhen-hua, ZHANG Lu
Research purposes：Currently the rail beam and the platform beam of the urban rail transit elevated station are designed as two separate structure.This structure occupies larger space and causes the station scale larger. It is not conducive to save project cost and to the landscape design. At the same time when there is an earthquake, because there is no connection between the rail beam and the platform beam, it is prone to collide, resulting in a rail beam and a platform beam damaging or even collapsing. In order to solve these problems, this paper proposes a new kind of rail beam and platform beam integrated structure, on the premise of meeting the station using function, the appearance and stress of the structure is optimized.
Research conclusions：（1）The results show that, all the indexes of the structure can meet the specification requirements.It is a safe and reliable structure. （2）The prestressed steel can be optimized, and opening range side girder and middle girder can adopt different specifications, making the two stress and deformation basically the same. （3）Opening range side beam is T beam that the torsional rigidity of cross section is small. The side girder stress can be improved by further optimization of section. （4）The slab thickness should not be too small, so as to avoid local deformation or local vibration impact on smooth of track structure, thereby affecting driving safety and comfort.（5）The research results can be widely used in elevated rail transit station.
2014 Vol. 31 (12): 57-61 [Abstract] ( 2735 ) HTML (1 KB)  PDF  (721 KB)  ( 197 )
62 Scheme Research on 32 m Double Track Simply Supported Trough Girder of Pearl River Delta Intercity Railway#br#
LI Hong-zhi
Research purposes：
Aiming at the characteristics of Pearl River Delta Intercity Railway, in order to give full play to advantages of trough grider, through comprehensive comparison and analysis research, this paper proposed scheme of 32 m double track simply supported trough grider for Pearl River Delta Intercity Railway.
Research conclusions：（１）Proposed scheme of 32 m double track simply supported trough grider with inclined wall Γ shaped web and solid bottom for Pearl River Delta Intercity Railway.（２）After comprehensive comparison, determined the deck arrangement that the cable trough is placed on both sides of the bottom of the groove track.（３）By analysis and comparison of various parts of the structure size for multiple program, multiple model, the recommended scheme met the use function, the index of calculation met the specification.（４）The recommended scheme satisfied the integral prefabricated erection construction demand, the transport frame integrated machine was more suitable for the trough grider, and put forward the transport frame integrated machine loading schema.（５）The research results can play a guiding role in the promotion and use of double simply supported trough grider of the intercity railway, as well as play a reference role in trough grider selection of other standard railway and subway.
2014 Vol. 31 (12): 62-66 [Abstract] ( 2647 ) HTML (1 KB)  PDF  (526 KB)  ( 107 )
67 Technical Points and Proposals for Tunnels of High-speed Railway in China
GONG Yan-feng1, XIAO Ming-qing2
Abstract：Research purposes：
Through scientific research, development and operation, the tunnels of high-speed railway in China has formed a complete set of technology for design, construction, test and acceptance of quality. Thus, summarizing the technical innovation, research results, experiences and lessons from construction for tunnels of high-speed railway in China can provide basis for tunnel criteria revision and engineering construction for high-speed railway in China, and help to form a perfect technical system for high-speed railway construction.
Research conclusions：By systematical summary of tunnel technology for high-speed railway of China, this paper proposes technical essentials for tunnel of high-speed railway in China, followed by solutions to existing problems:（1）It summarized the design points for tunnels of high-speed railway in China, including to deal with aerodynamics design, large cross-section structure design, new  portal and waterproof and drainage structure type and  system  adapted to local conditions. （2）It summarized the design points for tunnels of high-speed railway in China, including to deal with blasting control for large section tunnel, mechanical matching, bad geological tunnel, geological prediction, monitoring measurement and risk management.（3）It summarized the quality test technology,  static and dynamic acceptance demands for tunnels of high-speed railway in China.（4）It analyzed the problems for tunnel of high-speed railway in China, such as lining quality defects, permeability and water leakage and erosion at entrance and slope, and also gave some suggestions.  (5) The research can provide a reference to improve and perfect the tunnel design and construction for tunnels of high-speed railway in future.
2014 Vol. 31 (12): 67-71 [Abstract] ( 4966 ) HTML (1 KB)  PDF  (399 KB)  ( 247 )
72
Terminal Interchange Program Design near Tunnel Portal of  Special Terrain
Terminal Interchange Program Design near Tunnel Portal of  Special Terrain[J]. 铁道工程, 2014,31(12): 72-')" href="#"> U Rui-qiu， PANG Xue-chun
Abstract：Research purposes：The construction of terminal interchange near tunnel portal often is a large-scale and high-costing project. Based on completed terminal interchange programs, this article makes a detailed analysis about the feasibility of their planning about channel, corridor, plane and profile section, and centralized and uncentralized setting, to find a new way for the construction of terminal interchange near complex-conditioned tunnel portal, to provide reference for high grade highway survey, design and construction.
Research conclusions：(1) In a planning of terminal interchange near tunnel portal, importance should be attached to major controlling factors, avoid missing important programme. (2) It is necessary to further investigate and analyze, first of all, combined with the existing control choose main plane position scheme. (3) Reasonably adjust the main line longitudinal section elevation, to determine the interchange's elevation scope. (4) Compare and select centralized and uncentralized setting interchange scheme. (5) By carefully selecting and continuous optimization, we can work out the best program that can provide us safety, functional perfection, scale-suitability, and environmental harmony. (6) The research results can provide a good guide for interchange program design near tunnel portal under difficult conditions.
2014 Vol. 31 (12): 72- [Abstract] ( 2724 ) HTML (1 KB)  PDF  (929 KB)  ( 80 )
77 Analysis of the Canopy Vibration of Beam String Structure due to Train Wind Hot!
MI Hong-guang
Abstract：Research purposes：The large span beam string structure which has large flexibility, light weight, is wind sensitive structure. The train passed through the station, the train wind pressure may act locally to building strong, so that the bottom chord tension chord cable stiffness degradation, change the structure stress performance or cause the structural resonance, adversely affect the structure. In this paper, as the no station column canopy of beam string structure of Jinan West Railway Station of Beijing-Shanghai High Speed Railway for example, it analyzed the cause of no station pole canopy on the train wind pressure and the change law and influence on canopy structure when train travels at high speed.

Research conclusions：Through the research, we can draw the following conclusions: (1) The pressure of train windattenuates rapidly in vertical direction and decreases linearly in horizontal direction.  (2) The displacement in Z and Y direction of the string beam changes little, as well as the stress in cable and steel beam. (3) Frequency of the platform awning structure vibration caused by train wind distinguishes from natural frequency of vibration of the structure, resonance would not happen. (4) The research results can provide a guidance to design of facilities in train station yard, such as large-span canopy and so on.
2014 Vol. 31 (12): 77- [Abstract] ( 2621 ) HTML (1 KB)  PDF  (1012 KB)  ( 145 )
83 Design for Double Hinged Bearing of Dome in Yujiapu Railway Station#br#
GAO Xiu-jian, SONG Chang-jiang
Abstract：Research purposes：The dome of newly-built Yujiapu railway station in Beijing-Tianjin intercity line extension is a single layer shell structure, which is weaved by 36 positive and negative spiral grid. The shell with a long span of 143 m is novel and complex. This paper researches the force characteristics and boundary conditions in order to choose the suitable support programs of the shell.
Research conclusions：（1）Bearing is a key component of the connecting shell structure. The lower part of the support structure, support program is directly related to the assumed boundary conditions of the shell.（2）In determining the bearing reaction force, not only consider that the effect of the rotation center and the calculation model of bearing rotation center does not coincide with the additional bending moment, but also consider the rare earthquake force.（3）Double hinged bearing which is made of horizontal spherical steel bearing and vertical spherical steel bearing rotates along the bottom beam ring centroid, and satisfies the boundary condition. We use non-earthquake and rare earthquake condition of bearing reaction force envelope to do double hinged bearing arrangement in detail.（4） We conducted a double hinged bearing finite element analysis and a reduced scale test to verify that the stress and rotation performance meets the design requirements. （5）The research results of innovative double hinged bearing can provide references for similar projects. 

2014 Vol. 31 (12): 83- [Abstract] ( 2837 ) HTML (1 KB)  PDF  (951 KB)  ( 211 )
88 Research on the Urban Rail Shield Tunnel for Train at Highest Running Speed of 120 km/h Hot!
Abstract：Research purposes： At present, all problems of urban rail transit that the highest running speed of the train is more than 100 km/h are not specified or required in the urban rail transit specification in China and  there is also not the similar successful experience at abroad. On the background of Line R2, Dongguan urban rapid rail transit, the study has been made on urban rail transit that the highest running speed of the train is more than 100 km/h, and comfort standard during the running of train, aerodynamic effect and design of auxiliary structure. The study result can provide a direct guide for engineering design and a reference for similar engineering.

Research conclusions：(1) If the train speed is more than 100 km/h, the inner clearance of underground sectional tunnel section meets not only gauge requirements, but also aerodynamic effect. According to current actual conditions, the effective section area of the tunnel should be enlarged to meet the comfort requirement. (2) The flat shield tunnel lining structure with C50 single-layer reinforced concrete that the inner diameter is  6.0 m and outer diameter is 6.7 m can meet the structural mechanics of sectional tunnel and comfort requirement of urban rail transit with the highest running speed of 120 km/h. (3) The above research achievement has been applied successfully to urban rail transit.
2014 Vol. 31 (12): 88- [Abstract] ( 2706 ) HTML (1 KB)  PDF  (1046 KB)  ( 110 )
93 Risk Assessment of Ground Collapse Caused by Metro Construction Based on the Qualitatsnive Semi-quantitative Method#br#
ZHANG Chang-xin, YU Zhi-jiang, ZHENG Tai-hang
Abstract：Research purposes： According to the uncertainty and fuzziness on risking assessment of the ground collapse caused by metro construction, this paper qualitative analyzed the essence and influence factors of ground collapse. A semi-quantitative assessment model which used to risk assessment of the ground collapse was established by choosing some key influence factors.
Research conclusions：(1) The risk assessment of the ground collapse is in the basic stability to less stability. (2) At some part of the line, sand layer is closed to the top of tunnel or get into tunnel. Because sand layer has the properties of large thickness and moisture rich, the risk assessment of the ground collapse caused by metro construction is less stability. (3) At some part of the line, because the tunnel across through large thickness of strata rock stratum, the risk assessment of the ground collapse is basic stability. (4)The result of analysis based on the qualitatsnive semi-quantitative method agree with project  reality, which has a certain reference significance for geological hazard assessment of similar urban rail transit projects.
2014 Vol. 31 (12): 93- [Abstract] ( 2682 ) HTML (1 KB)  PDF  (304 KB)  ( 148 )
96 Research on the Principle of System Capacity Loss in the Mode of Express/Slow Urban Rail Transit  #br#
Abstract：Research purposes：As urban rail transit network backbone lines were constructed, the peripheral group or satellite city construction fast channel now were demanded, and the express/slow train organizationmode gradually began to be studied and applied in the urban rail transit. This kind of train organization mode can give full play to the economic benefits of rail transit, and also the transport capacity can also be used efficiently. But the express/slow train organization mode is complex, it would reduce the system capability to a certain extent, so it is necessary to analyze the system capability loss problem.
Research conclusions：Through the research, this paper draws the following conclusions: (1) The express train which does not stop at station，will save time about 1min (including idle stop time); (2) In the run chart based on traditional parallel paired, this paper put forward the express/slow train operation effect on system capacity loss formula; (3) The research results can provide the  reference for research and implementation for city rail transit line scheme in future.
2014 Vol. 31 (12): 96- [Abstract] ( 2659 ) HTML (1 KB)  PDF  (842 KB)  ( 161 )
101 Research on the Configuration Scheme of Signal Equipment for Locomotive Traction Trains Operating on the Passenger Dedicated Railway Line#br#
SHEN Zhi-ling
Abstract：Research purposes：The purpose of this paper is to investigate the special transportation demands lines required by some of the operating locomotive traction passenger trains in the passenger dedicated lines. After examining the compatibility scheme of the train control system and the configuration scheme of the trackside signal equipment, this paper proposes the matching interface requirements for the platforms and the effective length of tracks.
Research conclusions：(1) Compared to the method and technique of using CTCS-2 on board equipment, the method of setting additional trackside signal is more mature and convenient, which can satisfy the special transportation demands lines required by some of the operating locomotive traction passenger trains in the passenger dedicated lines. (2) When the effective length of track is 650 m, exit signal should be place 5 m away from the fouling post. (3) If CTCS-2 on board equipment is adopted by the locomotive, when the effective length of track is 650 m, the marshalling length of locomotive traction trains should be restricted, and the structure and setting location of exit signal machine, as well as installations such as Balise and platforms should be configured based on the passenger dedicated line standards. (4) It suggests to modify the construction clearance of the dwarf exit signal machine for the passenger dedicated line to satisfy the signal machine installation requirements; if locomotive traction trains are to be operated in the CTCS-3 section, double mechanism exit signal machine with calling-on signal should be adopted to meet the function requirements of the departure calling-on mode. (5) The research conclusions can provide references for the signal engineering design of passenger dedicated railway lines.
2014 Vol. 31 (12): 101- [Abstract] ( 2621 ) HTML (1 KB)  PDF  (546 KB)  ( 142 )
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