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20 March 2015, Volume 32 Issue 3
    

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  • Survey of Shallow Layer Natural Gas in Chengdu-Guiyang Railway of South Sichuan and Southwest Sichuan
     
     
    YUE Zhi-qin1, DING Hao-jiang1, SU Pei-dong2, SUN yi1
    铁道工程学报. 2015, 32(3): 1.
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    Abstract：Research purposes：Chengdu-Guiyang railway is crossing through multiple oil and gas fields and structures in the red-rock region in Leshan and Yibin. The safety of operation and construction of railway tunnel and deep foundation pit are seriously affected by the shallow natural gas. The purpose of survey is to find out the basic rules of extraction, storage and migration of natural gas, and to provide basis for the railway engineering settings.
    Research conclusions：(1)Chengdu-Guiyang Railway is located in the natural gas fields of south Sichuan and southwest Sichuan,  9～11 oil and gas reservoirs in total are found in Triassic, Permian and Sinian strata, the depth of industrial valued gas is about 806～2 358 m. (2)Oil and gas are stored in the crack and pore of strata, the top covering are impregnated by the vertical-migrated gas. It makes the sandstone and mudstone of shallow red rock containing natural gas, and the gas content is positively correlated with the vertical depth, some deep crack can be the pipe for gas-overflowing. (3) The depth of gas weathering crust is 70 m. (4) By the estimation of maximum volume of shallow gas-overflowing in unit time, 3 tunnels are judged as gas tunnel, 22 tunnels as low gas tunnel. (5) Bridge and subgrade can be chosen as preferred engineering form in route selection. The tunnel should take shallow buried and short tunnel group form, the core 〖JP2〗of gas field should be bypassed, and the railway should go through small hills and alongside-〖JP〗mountain sections. (6) The results of this survey can be used for the survey and construction of route, underground engineering, deep foundation (wells) in natural gas region.

  • Application of Integrated Geological Analysis Method in Landslide Prediction and Remediation
    KANG Cheng-lei
    铁道工程学报. 2015, 32(3): 6.
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    Abstract：Research purposes：Two serious landslide danger appeared in the section of the subgrade of the fifth tender in the Kunming south connecting highway engineering, in the upcoming delivery before acceptance. One of them has been completely slump，another has been in critical state before sliding collapse. Through on-site investigation and analysis of the engineering case and remediation treatment, try to find a way to predict early engineering landslide and to provide countermeasures in order to reduce or even avoid engineering landslide disasters，to provide reference for dealing with the similar problems of the slope engineering in the highway, railway, subway, reservoir dam and other projects in the future.
    Research conclusions：(1) The nature and status of the two existing landslides are very different. Among them，one in K 23+475～550 is shallow bedding rock landslide in a state of sliding down completely，which has been basically stable；another in K 23+680～800 is deep towed soil landslide，in the stage of the creeping deformation into the sliding down，and its state is very unstable. (2) By using integrated geological analysis method，it has been analysed and predicted that the slope in K 23+550～680 is potential shallow bedding rock landslide，and a great possibility slumping. (3) According to the natures characteristics of their own，different regulation scheme are put forward，which in turn are respectively: thoroughly remove, pre-reinforcement, emergency anti-sliding and permanent against sliding. (4) The method of integrated geological analysis which is put forward in this paper，will provide a reference for predicting disaster, emergency rescue, permanent remediation of the similar slope engineering.
  • Experimental Research on the Differential Settlement of Soft Soil Ground in High-speed Railway
    WANG Xiang
    铁道工程学报. 2015, 32(3): 11.
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    Abstract：Research purposes：It is a problem to choose economic and reasonable method of soft soil ground treatment to meet the strict standard of differential settlement of high-speed railway engineering. The differential settlement of soft soil ground treated with dry jet mixing pile, deep cement mixing pile, vacuum preloading combined with heaped preloading, plastic drain belt combined with surcharge preloading, sand pile combined with surcharge preloading, among soft soil ground, bridges, and culverts, were studied through the field test in high-speed railway.
    Research conclusions：(1)The methods of soft soil ground treatment and type of structures have great influence on residual longitudinal differential settlement. (2)The transverse differential settlement changes greatly during 3 months after embankment being filled. The transverse differential settlement will not do harm to train with a longer period of preloading. The load is not a main factor to residual longitudinal differential settlement.
    (3)It should be avoided to changing method of soft soil ground treatment in same site. The transition area should be adopted among embankment, bridges, culverts, and soft soil ground treated with different methods.
    (4)The research results can be used in the design and the construction of high-speed railway.
  • Comparative Research on Internal Force Calculations of Herringbone Micropiles System on Sliding Surface
    AN Meng-kang, ZHENG Jing, MENG Jin-bao, SU Jun-xia
    铁道工程学报. 2015, 32(3): 16.
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    Abstract：Research purposes：Generally, for structure system of micro-pile connection on the top, it calculates the internal force on sliding surface by summing each pill force, but not considering the structure is unreasonable. In this paper, the herringbone micro-pile above the sliding surface is divided into three types: single pile, top-hinged-joint steel frame construction and top-fixed-connection steel frame construction. Under the condition of landslide force which is rectangular distribution, the calculation formula of internal force of sliding surface is deduced and comparatively studied.
    Research conclusions：(1) Comparing the calculation formula of simplified single pile model with frame structure model, the results make a big difference. (2) Under the calculation method of frame structure model, the bending moment and shear force are dwindling but axial force is increasing. It indicates that the method does not apply to force calculation of the micro-pile system. This calculation result of simplified model take insufficient account to withdrawal resistance of pile body in micro-pile system. The calculation also indicates that the method of top-connection steel frame construction has less effect to calculation result. (3) The research result can be referenced in designing area of similar anti-slide structure system.

  • Research on the Dynamic Response of Pile-plank Wall for High Embankmentin High Intensity Seismic Area
     
    JIANG Chu-sheng1，LI Qing-hai1，CAO Xin-wen2
    铁道工程学报. 2015, 32(3): 21.
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    Abstract：Research purposes：Yuxi-Mengzi Railway located in Yunnan province belongs to south extension of Qinghai-〖JP〗Tibet Plateau, where as the geological environment is complicated there is active neotectonics, earthquake strikes frequently in this region. The high-slope embankment on Yuxi-Mengzi Railway is strengthened by pile-plank wall in the design. For the seismic performance evaluation of pile-plank wall, the vibrating table test was conducted to study the stability, settlement and displacement of pile-plank wall of retaining structure under the seismic load and analyze dynamic response of pile-plank wall under different seismic acceleration. The anti-seismic reliability of the retaining structure is researched, compared and analyzed with the current design and calculation method.
    Research conclusions：（1）The horizontal displacement of pile-plank wall , moment of pile body and soil pressure of retaining plate increases with increase of the seismic acceleration. （2）When the seismic intensity is equal to or more than 8 degrees, for the moment of pile body and soil pressure of retaining plate, the test value are more than design value calculated by quasi-static method. This means when the earthquake intensity is less than or equal to 7 degrees, the structure can be designed according to the traditional quasi-static method and when the intensity is equal to or more than 8 degrees, the structure′s safety factor should be appropriately increased.
    (3) The results have been successfully applied to the embankment retaining reinforcement engineering of many new double-track railways in high-intensity seismic area.

  • Research on the Influence of Lateral Expansion of Bridge on the Deformation of the Ballastless Track
     
    TIAN Chun-xiang
    铁道工程学报. 2015, 32(3): 25.
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    Abstract：Research purposes：In the case of the concrete bridge connected to roadbed or steel bridge, with the temperature changes, due to differences in scale-displacement of the beam seams on both sides, the force and track alignment irregularity would be impacted of ballastless track on bridge. Through the establishment of the line, plates, bridges, piers integrated space coupling model, this article analyses the forces of track structure near the beam seams and the influential factors of track alignment irregularity, and confirms the value range corresponding to the main factors, so as to provide theoretical guidance for the subsequent bridge bearings, line spacing design.
    Research conclusions：(1) The track plate temperature changes will cause track gauge change, but will not cause the gauge overrun. (2) CA mortar layer and rail friction resistance have a little influence on track alignment irregularity and boss force in vertical and horizontal distribution coefficients and lateral stiffness on the pier, however, temperature change width of the steel beams and distance from transversely fixed bearing to the centerline would have great impact. (3) According to the track alignment irregularity limits, distance limits between lateral movable supports and fixed bearings are determined under different conditions of temperature increase and line spacing the distance, providing theoretical guidance for bridge bearings settings. (4) The research results have been applied to ballastless track design of Chengdu-Mianyang-Leshan Railway.
  • Mechanical Properties of the Railway Bridge Strengthened with After-prestressing Cables
    ZHOU Chang-dong1, ZHANG Bao-yan2
    铁道工程学报. 2015, 32(3): 31.
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    Abstract：Research purposes：To restraint the transverse vibration of the deficient bridges, a potential retrofit measure named after-prestressing cables retrofit method for the railway bridge is proposed in this paper. This method does not affect the normal operation of the train, so it can significantly shorten the construction period, reduce the loss of transport, and guarantee the safe operation of the railway lines. In this paper, theory for this method is explained in detail, the influences of various modeling parameters, such as the location of the cable, the initial value for prestressing and the inclination angle of the cable are numerically assessed. Based on the analytical results, some proposal values for the aforementioned parameters are provided for their application to practical problems.
    Research conclusions：(1) The more layers of cable arranged, the more first-order frequency of lateral pier increased; cables should be arranged between the top of the pier and top 1/3 in the high range. (2) The force of cables should not be too large, just ensure cables have tension. (3) When the cables angle with the pier body reaches 50 degrees, the first-order frequency of pier reaches the maximum value. In order to facilitate the construction, the cables should be fixed on the ground anchorage system which side existing longer cable. (4) The cables shall be determined by features which associates to the pier in the practical engineering application. (5) The research results can be used for railway bridge piers reinforcement about transverse amplitude.

  • Experimental Research on the Influence Surface of the Orthotropic Plate and the Bridge Deck Pavement
     
    TANG Xi-biao
    铁道工程学报. 2015, 32(3): 37.
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    Abstract：Research purposes： The orthotropic plate and the bridge deck pavement is composed of multi-level structure and a variety of materials，the local stress is very complicated. However，the current domestic research on it more focus on the theoretical calculation, the relevant test is little. In order to master real stress distribution of the structure, on the basis of the theoretical calculation, taking a bridge in Xiamen as the background, this paper carried on influence surface loading test of the bridge deck pavement by the orthogonal plate, studs and concrete pavement layers, to verify that the related theory and calculation method.
    Research conclusions：It shows that the results of test agree well with the calculated results. The testing scheme can better reflect the distribution of the orthotropic plate and the bridge deck pavement structure level. The bridge deck structure has a strong impact on the surface distribution of local effects, the impact of three typical lateral positions is in the range of 1～3 U-ribs span length, the scope of the longitudinal is about 5 U-ribs span length, but the vertical and horizontal impact within a large area is substantially in 1 U-rib pitch length. The research methods and results can provide reference for design and research of the orthotropic plate and the bridge deck pavement.

  • Effects Analysis of the Cross-sectional Shape on Double-limb Thin-walled Piers′ Temperature Field
    ZHANG Yun-bo, CAI Ting-ting, LIU Yang
    铁道工程学报. 2015, 32(3): 41.
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    Abstract：Research purposes： The concrete structures with high pier and long span placed on the natural environment, inevitably exposed to the direct sunlight temperature load effect, in this load, the double-limb thin-walled pier will have a greater temperature stress and deformation and cause serious engineering accident. This paper focuses on Mingshui bridge′s 105.09m double-limb and rectangular hollow pier of Xingtai-Fenyang Highway, using ANSYS finite element analysis software′s thermal analysis and coupled analysis, analyzes the temperature difference effect of the thin-walled hollow high pier with different cross-sectional shapes under the solar radiation in the simulation analysis.
     
    Research conclusions：The results shows that: (1) ANSYS finite element analysis software′s thermal analysis and coupled analysis can calculate double-limb thin-walled pier′s temperature field and temperature difference effect. (2) Temperature stress increases with the section edges increasing, but the deformable structure decreases with the section edges increasing. (3) The maximum temperature stress in general appears at the corner of the section. (4) When design the double-limb piers in different sections, the effect of the different cross-sectional shapes on the temperature stress and deformation should be considered, and select the appropriate cross-sectional shape to make high bridge pier′s temperature cracks in minimum range. (5) The research results can provide a reference for design and construction of thin-walled high piers.
  • Analysis of Seismic Isolation for Frame Tied Bridge under the Effect of Traveling Wave
    LI Xiao-zhen1，LIU Zhen-jie1，XIN Li-feng1，LEI Hu-jun2
    铁道工程学报. 2015, 32(3): 46.
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    Abstract：Research purposes： Taking a frame tied bridge with continuous box girder whose span arrangement is （24+160+24） m as an engineering background, this paperadopts multi-point excitation realized by large mass method to consider the effect of traveling wave. And the responses of structures with different systems were analyzed comparatively, and parameters of elastic link device and viscous damper were selected reasonably to provide the basis for the reasonable selection of seismic isolation measures of arch bridge.
     
    Research conclusions：(1) Parameters of damping device have a great impact on damping effect when the effect of traveling wave is considered. The comparison results of damping effect indicate that elastic link device and viscous damper have the same damping effect to axial force of ribs, but choosing elastic link device is better when involving decreasing bending moment of ribs. (2) The application of isolation system and the symmetry of damping device's set can make the distribution of internal force of ribs evenly, which can relieve the adverse effect of traveling wave. (3) Only using isolation system can reduce structure frequency effectively, but will lead to large displacement amplitude. The installation of damping device can reduce displacement amplitude significantly. (4) The research results can be used in guiding for seismic design of arch bridge.
  • Comparison Research on Bridge Location for Multi-aperture Super-long Shanxi-Shaanxi Yellow River Super Large Bridge
     
    LIU Jian-li
    铁道工程学报. 2015, 32(3): 52.
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    Abstract：Research purposes： The Shanxi-Shaanxi Yellow River Super Large Bridge is one of the major projects in Datong-Xi′an Railway. Bridge location of this super large bridge is controlled by many factors, especially hydrology, environmental protection, and military installations. In order to make the comprehensive optimum scheme, this paper makes a elaborate analysis and comparison between bridge location and the style of main bridge, finally obtains a technically feasible, economically reasonable bridge location scheme.
     
    Research conclusions：(1) After making a elaborate analysis and comparison between bridge location schemes, a reasonable recommended proposal is obtained which is technically feasible, economically reasonable, and easy to implement. (2) The achievement has been applied to Shanxi-Shaanxi Yellow River Super Large Bridge in Datong-Xi′an passenger dedicated line on July 7, 2014 and can provide reference for similar bridge constructions
  • Research on the Twice Vertical Swivel Technology by the Negative Point of View of the Needle Steel Tower
     
    TANG Yong, SONG Xiao-san
    铁道工程学报. 2015, 32(3): 57.
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    Abstract：Research purposes：By using the twice vertical swivel technology by the negative point of view and computer network control synchronization technology of raising and lowering developed vertical swivel construction to needle steel tower of cable-stayed bridge in Shanghai Yunzaobang. This paper sums up the experience to explore the application promotional value of this new technology in the bridge engineering construction of the leaning tower steel structure assembly.
     
    Research conclusions：By comparison with the different method of the steel tower construction technology to select the optimal solution, it is concluded that: (1) It adopts the hydraulically synchronous technique to hoist the negative point of view of the needle steel tower which centered on the steel tower angular point, to swing the steel towel in place with 75°,then synchronous lowering it to the theoretical position. The technology is advanced and reliable, the scheme is reasonable and feasible. (2) The technical innovation on the twice vertical swivel technology by the negative point of view of the needle steel tower is successfully used in Shanghai Yunzaobang cable-stayed bridge，it can guarantee the rapid, efficient, safe and high quality, which can save about three months period and effectively lower the cost. (3) It can be used in the steel structure assembled construction fields of the high and thin inclined tower.
  • Several Key Technical Problems of Foshan-Dongguan Intercity Railway Shiziyang Tunnel
     
    XIAO Ming-qing，JIANG Chao，DENG Chao-hui
    铁道工程学报. 2015, 32(3): 62.
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    Abstract：Research purposes： Foshan-Dongguan Intercity Railway Shiziyang Tunnel whose structure external diameter is 13.1 m is the largest railway shield tunnel in China. This project has multiple characteristics of large exradius(13.1 m), high water pressure(7.8 bar), complex geological conditions(soil and rock mix ground, cross-over 3 fracture zone and 2 underwater faults), high speed (200 km/h), a new type of shield machine (dual-mode). To ensure the safety of construction and operation in this project, the key technical issues of overall design, construction organization planning, disaster-resistance of structure and evacuation design must be solved appropriately.
     
    Research conclusions：（1）The underwater tunnel in the mix ground should be buried in the bedrock suitablely,The rock cover thickness of underwater tunnel can be determined, with the principle of "Working chamber should satisfy the security criteria, and the sum of relaxation of surrounding rock and deformation pressure is relatively small". （2）The tunnel with double tracks can be adopted if the tunnel is not very long, and evacuation corridor can be set up over the tunnel floor, to implement simultaneous construction, the intermediate box culvert can be precast. （3）In order to reduce the local rock fracture zone effect upon construction, Dual-mode can be used in shield tunneling. （4）To enhance the capability of disaster-resistance of structure, adding steel fiber and polypropylene fiber to reinforced concrete lining segment is a kind of feasible scheme. （5）The research results can be used in the design of underwater shield tunnel in mix ground.
  • Tunnel Deformation Prediction Based on Modified Support Vector Machine
    ZHOU Qi-cai,FAN Si-xia, ZHAO Jiong, XIONG Xiao-lei
    铁道工程学报. 2015, 32(3): 67.
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    Abstract：Research purposes： In order to remove the noise of metro tunnel deformation monitoring data which affected by environmental factors and increase the extrapolated predictive ability of deformation data, a new prediction method based on discrete wavelets and a modified support vector machine (SVM) is proposed.
     
    Research conclusions：(1) The noise of tunnel deformation data can be removed by discrete wavelet analysis and the low frequency effective information can be acquired. (2) A dynamic on-line sliding window technique is introduced. Additionally, the final training samples and the training samples of the tunnel deformation prediction model could be determined by utilizing the two orders of sliding windows which aiming at dynamically adjusting and updating the number of samples. This could improve data utilization rate. (3) The performance of prediction model has been validated with Shanghai metro deformation data under steady state and unsteady state. The results show that this method has good de-noising effect and high precision. Also, the prediction model could be transferred to engineering application and may give references to the construction of tunnel prediction model.
  • Research and Application of the Design of Exit Tunnel
     
    XU Jia-min
    铁道工程学报. 2015, 32(3): 73.
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    Abstract：Research purposes： Affected by the terrain and engineering geological environmental conditions, the relative stability of the surrounding rock in the portal section of tunnel engineering is poorer, the construction difficulty and the risk is bigger, the way of design and construction of entrance from the outside to the inside is generally used, and there is little information about the design of exit from the inside to the outside. This paper combined with specific engineering case for the design of tunnel engineering in the research, better realized the tunnel engineering of exit tunnel construction, put forward the design method of exit tunnel, and summarized its advantages and application promotion value,to provide the reference for the designer and constructor.
     
    Research conclusions：(1) The design of exit tunnel need to study the hole location and tunnel portal design, construction scheme, structural design, aided engineering measures, hole slope treatment, etc.(2) Application in the engineering example, verifies that the design scheme of exit tunnel is feasible and reliable, and achieves good social and economic benefits. (3) This paper also summarizes its advantages and application promotion value of exit tunnel, especially suitable for medium and short tunnel or one end into the tunnel hole construction.
  • Causal Analysis and Governance of the Water & Mud Bursting in Daliang Tunnel on Lanzhou-Xinjiang Second Railway
     
    ZHANG Min-qing1，HE Zhi-jun1，HUANG Hong-jian2，REN Shao-qiang3，SHAN Hong-yu4
    铁道工程学报. 2015, 32(3): 77.
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    Abstract：Research purposes： When Daliang tunnel of the Lanzhou-Xinjiang second railway constructs to the contact zone of the limestone and the slate in the syncline wing, sudden water & mud bursting disasters occurred many times, and the largest water inflow was 10 000 m3/h, the total of the mud-sand and stone was 20 000 m3,the deposition in the tunnel length was 236 m. Through the analysis of the reasons for water and mud bursting disasters, the effective management program was taken, the good processing effect was obtained.
     
    Research conclusions：(1) In the contact zone of the soft and hard rock in deep railway tunnel syncline wings, because of good water conductivity, soft rock crushes, is prone to water and mud bursting.Therefore, should strengthen the advanced geological prediction during construction, to prevent disasters. (2)After the tunnel water and mud bursting occurred, it is necessary to evaluate the risk of dredging. Dredging the reasonable position should be promptly applied for the wall, to prevent the occurrence of secondary disasters. (3) For the tunnel water and mud bursting, take "positive closure, side circuitous, high interception" measures, can form processing working face, and open up new forms of working face, both ends flanking the processing situation, at the same time, high water interception can reduce the difficulty of the breach processing. The engineering practice has proved that, "both ends flanking, grouting, pipe shed support" measure is the effective method for treatment of water and mud bursting. (4)The research findings can be applied in the similar tunnel for treatment of water and mud bursting.
  • Research on the Corrosion of Metallic Components of Overhead Contact System in Typical Atmospheric Environment
    LIU Li-rong1, YONG Xing-yue2, GUO Feng-ying1
    铁道工程学报. 2015, 32(3): 81.
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    Abstract：Research purposes： The railway transport plays a very important role in the development of our domestic economy. The electrified overhead contact system is a special power line erected along the railway. The metallic components of overhead contact system are inevitably corroded in different atmospheric environment, which will not only reduce lifetime of the metallic components and increase their maintenance cost, but also is a threat to safe operation of electrified railway. Therefore, it is necessary to study the corrosion influence of typical atmospheric environment on metallic components. Some new coating protection technologies should be developed to ensure the safe operation of electrified railway and reduce the maintenance cost of overhead contact system for electrified railway.
     
    Research conclusions：(1) The marine atmospheric environment is characterized by high air humidity and salt content. The metallic components are corroded seriously in the marine atmospheric environment polluted by acid gas. (2) The materials for catenary metallic components are diverse, but at present, only metallic component with Q235 material has been protected by the different levels of hot-dip galvanized anti-corrosion treatment. As the hot dip galvanized coating in the different corrosion environment medium is different in corrosion resistance, it is difficult that single hot dip galvanized anti-corrosion measure is used for the catenary metallic components to meet the development requirements of today's electrified railway. (3) To use organic coating for protection of existing catenary component can greatly improve the anticorrosion ability of catenary components in the typical atmospheric environment, increase the service life, save the maintenance cost and improve the reliability of catenary components. (4) The research achievement can be applied in the design and use of overhead contact system of electrified railway.
  • Safety Influence of Blasting Vibration on Multistory Building
     
    YU Lei
    铁道工程学报. 2015, 32(3): 86.
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    Abstract：Research purposes： The vibration amplification (motion at the top was amplified from the bottom motion) of general multistory buildings responding to blasting vibration was analyzed by monitoring structure response of different floors and observing the safety effect of blasting vibration.Additionally, the vibration allowable index for safety and comfort of residential buildings had been put forwardaccording to the usage state.
     
    Research conclusions：(1) When blasting vibration frequency was close to natural frequency of abuilding, the ground blasting vibration would be amplified in the upper portion of this multistory building,while blasting vibration frequency was well above natural frequency of the building, thevibration amplification of multistory building responding to blasting vibration would not easy occur.(2) According to the possibility of vibration amplification of multistory building responding to different vibration sources, suggestions were put forward that blasting vibration monitoring of different floors should be carried out if the building location was more than 100m away from explosion source, but only the vibrationof building bottom could be monitored under high frequency blasting vibration if the building was at a short distance of explosion source.(3) Safety values of controllingblasting vibration of different buildings were proposed according to requirements of building structural safety, decoration materialsafety and indoor comfort. (4) The research results can provide references for blasting vibration controlling in railway stonework blasting excavation.
  • Width Design of Subway Footway Considering the Randomness and State-dependence
     
    JIANG Yang-sheng, ZHU Juan-xiu, HU Lu, FANG Chuan-wu
    铁道工程学报. 2015, 32(3): 90.
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    Abstract：Research purposes： The width ofsubway footwaydetermines the level of service and the efficiency of circulation.To meet the given level of service and the demand of volatility,a queuing model considering the randomness and state-dependence of the passenger arrival and serviceis established to describe the footway queuing phenomenon,andthenthe quantitative association model between the level of service and footway width is developedtodesign the rational width of subwayfootway.
     
    Research conclusions：(1) According to the micro-simulation validation, the PH queuing model based on quasi birth and death processes can accurately describe footway queuingphenomenon.(2)The design width based on the PH queuing model is larger than that of other queuing models.(3)The real area per person under the design width based on the PH queuing model is closest to the design level of service, while the results based on other models are all unable to meet that.(4)The research result is of great significance for a real and effective description of the footway queuing phenomenon and for planning and operation of subway station.
  • Research on Law and Regulations System of Railway Construction Industry under New Situation
    WANG Shu-yu, WANG Ying-ying
    铁道工程学报. 2015, 32(3): 96.
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    Abstract：Research purposes： Under the background of revocation of Ministry of Railways and seperation of government from enterprises, status and adjustment solution on railway construction law and regulations system will be discussed. Thus some suggestions will be pointed about how to build the new law and regulations system under new situation.
     
    Research conclusions：(1) The first and second level of law and regulations do not need to be adjusted, but the left normative documents which were issued by the Pre-ministry of Railways should be adjusted. (2) Up to March 2013, there are 112 valid normative documents. If divided as functional principle, 23 files can be classified as governmental function, 62 files can be classified as business function, and 27 files can be classified as bit of both function. (3) All the valid documents should be separated as the function type. China Railway Corporation can build the internal construction management files system for business function, and National Railway Administration can build the new law and regulation system for governmental function.（4）National Railway Administration should take construction standard and cost standard into the law and regulations system, and focus on its lawful duties, such as quality, safety, bid and bidding, and other market management functions. At the same time, continuity and applicability request should be considered as well. (5)The research result can be applied in construction management field and can be reference for law and regulations system adjustment of National Railway Administration.
  • Research on the Safe and Collaborative Management Mode for Beijing-Tianjin-Hebei Railway
     
    DUAN Xiao-chen1,WANG Zhao-yu1, SUN You-cai2，ZHANG Jing-bo2
    铁道工程学报. 2015, 32(3): 101.
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    Abstract：Research purposes： Safety is the lifeline of railway development，Beijing-Tianjin-Hebei railway safety management should be paid more attention. By sorting China’s railway safety regulations, this paper tries to discuss appropriate government collaborative management of the Beijing-Tianjin-Hebei railway safety based on the current railway safety management situation and the experience of developed countries.
     
    Research conclusions：(1) Government regulation to the local railway safety of Beijing, Tianjin and Hebei is uneven, the government management of Hebei railway is too complex to create synergy, while Beijing’s and Tianjin’s are relative lack. (2) The United States exert particular emphasis on railway safety risk management. Japan is particularly concerned about the supervision of employees and enterprise system. The EU's cross-regional management is responsibility-clear and labor-division clear. China’s railway safety risk management is weak and pay less attention to the entire regulation. (3) Local laws and regulations, government organizational structure should be improved, and the powers and responsibilities of the parties should be clear to improve regulatory efficiency. (4) The conclusions can provide references for the integrated traffic development of Beijing, Tianjin and Hebei.
  • Sensitivity Analysis of the Influence Factors of the Construction Costs of Railway Station Buildings
     
    WEI Qing-chao, YAN Song-tao
    铁道工程学报. 2015, 32(3): 107.
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    Abstract：Research purposes： Influence factors of the construction project investment of railway station buildings are very complex. For the same structural form, there is a big difference of the construction cost because of the different area, column space and floor height etc. According to the medium and long-term railway network planning, a large number of railway station buildings will be built. In the premise of safety, function and construction requirements, it is necessary and urgent to systematically research the sensitive factors of the construction cost of the railway-station building and the sensitivity degree, and it will be very helpful to the better using of the railway-station building investment. Research conclusions：(1)In this paper, based on the mass data of established railway station buildings, the method of principal component analysis is used to analyze the complex factors of the construction costs, and the sensitive factors are obtained. (2) On this basis, the sensitivity degree of the most sensitive factors are calculated through the multiple linear stepwise regression analysis, and the results provide the guide direction for the optimization design of the railway station buildings.When the area of station building change+10% and -10%, the construction cost change 7.02% and -6.19%; when the height of floor column change +10% and -10%, the construction cost change 2.71% and -2.61%; when theprojected area of the steel structure of the roof change +10% and -10%, the construction cost change 3.58% and -3.38%. (3) The research results can provide the optimizing direction of the design of railway station buildings from the angle of investment, and some references to related area of investment control
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