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2015 Vol. 32, No. 12 Published: 2015-12-16

Geology and Subgrade Railway and Rail Bridge Engineering Tunnel Engineering Electrification Engrinnering Research on Railway Networks Survey and Design Urban Rail Construction

Survey and Design

	1	Research on the Route Selection of a Cross - sea Subway Tunnel Project ^Hot!
		WANG Xiang -hao,YANG Zheng,AN Ran
		Abstract ：Research purposes： The construction and operation of cross - sea tunnel project is difficult and risky because of the large range of sea area, the complex geological conditions, the high hydraulic pressure and corrosion. Therefore, the investigation of geological and hydrological conditions and various routing selection for different construction plans is the key factor for the reduction of investment, risk and maintenance of the cross - sea project. The principles and schemes of the routing selection for different construction plans and geological conditions are discussed in this paper. Research conclusions ： (1) The implementation of geophysical survey, drilling and experimental verification contributes to the geological probe of the cross - river projection. (2) The routing plans and construction methods are determined by the analysis of geological conditions. ( 3 ) The plan combined shield and mining methods is recommended considering the poor geological conditions, period and investment of the construction. (4) The research result can provide reference for other similar cross - sea project.
		2015 Vol. 32 (12): 1-6 [Abstract] ( 2787 ) HTML (1 KB) PDF (943 KB) ( 2563 )

Geology and Subgrade

	7	Analysis of Unstable Models and Movement Characteristics of Unstable Rockfall at Pingshang Tunnel Entrance
		DING Hao -jiang, ZHAGN Guang -ze, YUE Zhi -qin
		Abstract ： Research purposes ： The slope is high and steep, and there exists unstable rockfall above the Pingshang tunnel entrance. Instability of unstable rockfall that has sudden and concealment, caused great harm, and seriously afected the railway construction and operational safety. This paper analyzed and researched the formation mechanism , unstable models of unstable rockfall at Pingshang tunnel entrance and movement characteristics after the destruction , to determine instability rolled probability and path of the unstable rockfall , put forward targeted remediation and protection measures , and also provided research , analysis , calculation methods and engineering protection measures when exist unfavorable geological hazards that unstable rockfall in other mountain railway. Research conclusions ： (1) Based on the investigation and the actual measurement of the unstable rockfall , the unstable models of unstable rockfall above the Pingshang tunnel entrance are divided into four types. (2) Through simulating the movement characteristics of the rockfall , identify that about six percent of the unstable rockfall instability above the Pingshang tunnel entrance will cause danger to the tunnel entrance and bridges. (3) Put forward prevention measures and the specific location of protection , to ensure the railway construction and operational safety. (4) The research results can be applied to survey and design of unstable rockfall unfavorable geological engineering.
		2015 Vol. 32 (12): 7-11 [Abstract] ( 3035 ) HTML (1 KB) PDF (695 KB) ( 2639 )

	12	Research on the Problems of Collapsibility of Loess Tunnel Foundation ^Hot!
		LI Guo - liang 1,SHAO Sheng - jun2, JIIV Bao - cheng 1,WANG Xin - dong 1,XU Chong 1
		Research purposes： Although lots of tunnels have been built in loess regions, there is no professional specification or regulations were proposed yet for design of loess tunnel expect 11 code for building construction in collapsible loess regions GB 50025 - 200411. During the process of traditional tunnel foundation treatment in loess region, the construction is difficult , low and difficulty and high - risk. In terms of the study reports of Zhengzhou - Xian and Baoji - Lanzhou dedicated line , the collapsibility conditions and mechanical behavior of tunnel engineering is different from that of civil engineering. So a new collapsible mechanism and treatment of loss tunnel should be proposed more than quoting the old specification in civil engineering. Research conclusions ： (1) Internal factors of collapsible loess is determined by its special honeycomb structure. Meanwhile, its inducing factors and necessary conditions depend on applied loading and water. (2) Tunnel foundation induced by tunnel excavation is unloaded, contrary to that of civil engineering. (3) Calculation zero point of collapsible loess thickness start from the bottom of tunnel ( other than that in civil engineering start from ground) excluding from the contribution of soil from both sides and top of tunnel. (4) The calculation of collapse deformation is equal to an accumulative value of al soil layers beneath the tunnel foundation and classification of collapsibility is divided into three gradations based on collapse deformation. (5) Tunnel portal is generally necessary to be treated for collapsibility, corresponding technical principles about various tunnel foundation treatment are also subordinated to the 11 technical code for railway tunnel in loess Q/CR 9511 - 2014" and the achievements have been applied to the railway tunnel construction such as Baoji - Lanzhou dedicated line.
		2015 Vol. 32 (12): 12-16 [Abstract] ( 2787 ) HTML (1 KB) PDF (598 KB) ( 2694 )

	17	Analysis of the Classification of Weak Tunnel Foundation Soil and the Test Methods of Its Bearing Capacity ^Hot!
		ZHAO Wen
		Research purposes： Weak foundation soil is a special kind of soil type designated between normal soil and weak soil, there is no clear definition of standards. During tunnel construction, the ubiquity of weak foundation soil has a considerable impact on the construction design. Confined to the tunnel construction site and its engineering environment, how to choose the best method to test the bearing capacity of weak foundation soil, so as to confirm the nature of the soil, arrive at the bearing capacity ASAP, validate the geological exploration results , further modify the design to provide guidances to the construction , ad ensure the project quality to meet design requirements has become a major task for engineers. Research conclusions ： (1) As a natural tunnel foundation , the weak foundation soil can hardly meet the requirements in terms of strength and deformation. (2) The weak foundation soil includes soft clayey soil , powder soil , collapsible loess , expansive soil , saturated sand , red layer , filling , etc. (3) General test methods can be used in in - situ test and laboratory test. Light dynamic penetration test or cone penetration test is recommended. (4) The research result can be applied in the field of tunnel construction and supervision.
		2015 Vol. 32 (12): 17-19 [Abstract] ( 2803 ) HTML (1 KB) PDF (413 KB) ( 2635 )

	20	Research on the Expected Deformation Impact of Landfill Engineering on Existing Railway Subgrade
		ZHANG Yan
		Research purposes： With the railway development, landfill engineering near the existing railway may cause the structure deformation of railway, so while landfill near the existing railway subgrade, we need to forecast the impact of the landfill engineering on the deformation of railway subgrade to ensure the safety of railway , analyze the influence of the slope stability，filling height，different filling spacing and load hierarchical level on the deformation of the existing subgrade. Research conclusions:(1) At specific amount of landfill，the influence of multi - stage loading on railway subgrade is less than single - stage loading. (2) At a certain landfill height，the influence of three - stage loading on existing railway subgrade less than two - stage loading， and the influence of different spacing on subgrade is not linear relationship. (3) Under the equal hierarchical loading size, the filling spacing is the main factor that affects deformation of existing railway subgrade. (4) The research result can provide reference to reduce the influence of other similar filling near high - speed railway on railway.
		2015 Vol. 32 (12): 20-24 [Abstract] ( 3077 ) HTML (1 KB) PDF (633 KB) ( 2631 )

	25	Research on the Compound Structure for the Protection and Greening of Steep Rock Slope
		YUEPeng - fei
		Abstract ： Research purposes ： The protection and greening of hard steep slope has always been a difficult problem in engineering field. Based on the research of the protection and the greening of steep slope in Shenyun car depot of Metro Line 7 in Shenzhen, a complex structure to reinforce the steep rock slope is proposed. Use anchor bolts, grouting measures to reinforce the jointed surfaces and cracks of the slope, improve the global stability of the slope; use the vegetation bags and active protection nets to stabilize spraying combined materials and fragmented rock, improve the local stability of the slope, to weaken the water erosion on slope surface, to slow the weathering velocity of the rock slope surface and green slope. Research conclusions:( 1 ) The deep stability of hard rock slope is mainly controlled by the joints and fracture development degree in the internal structure, and the stability of the rock slope is better with the combination of systematic bolt and random anchor. (2) The vegetation bags can be fixed by a certain distance in the rock slope, so the friction coefficient of the rock slope can be improved, and the mixed substrate can be adhered to the rock slope. (3 ) The vegetation bags are used of the ordinary geotextile and internal filling with planting soil , when the spray mixture is stable on the slope surface and the grass will grow , the soil in the vegetation bags are exposed after the degradation of the geotextile, which can be used as a supplement to the slope soil. (4) The composite structure of the steep slope protection and greening in Shenzhen metro project has been a very good application , which can provide reference to the future railway , metro , highway and construction engineering of the rock slope protection and greening.
		2015 Vol. 32 (12): 25-29 [Abstract] ( 2756 ) HTML (1 KB) PDF (807 KB) ( 2581 )

	30	Research on the Monitoring Technology of Railway Subgrade Settlement Disease
		PANG Ying - gang 1,LI An - hong 1,XU Jun 1,LIU Yi2
		Abstract：Research purposes： Along with the development of the high - speed and heavy haul railway, subgrade settlement disease plays a key role in railway operation safety , which lots of subgrade diseases are relating to. This paper studies the characteristics and the action mechanism of railway subgrade settlement disease and the settlement prediction methods , analyzes the traditional subgrade settlement monitoring methods and three new subgrade settlement monitoring methods which contain vehicle - borne ground penetrating radar (Vehicle - borne GPR) monitoring technology , interfer ometric synthetic aperture radar (InSAR) and distributed Brillouin optical fiber sensing technology ( BOTDR) , and provides a reference for railway subgrade settlement disease monitoring. Research conclusions:(1) Railway subgrade settlement is mainly from two aspects of road base and foundation，which is produced under the function of a variety of factors. (2) Settlement prediction methods are mainly based on the existing monitoring data , and still in the process of development. (3) Traditional monitoring methods cant meet the modem requirements of efficient , non - destructive and real - time. New monitoring methods can basically meet the requirement , but there are still some limitations. (4) The distributed monitoring system has become the trend of the subgrade settlement monitoring technology.
		2015 Vol. 32 (12): 30-33 [Abstract] ( 2805 ) HTML (1 KB) PDF (409 KB) ( 2700 )

Railway and Rail

	34	Influence Factors Analysis of Expansion and Contraction Force of Continuous Welded Rails on Long - span Cable - stayed Bridge ^Hot!
		XU Hao1,LIU Hao2,LIN Hong - song1, YAN Hua1, WANG Ping2
		Abstract ： Research purposes ： The structure of cable - stayed bridge is a complicated special composite structure of “tower - cable - beam”. The bridge - rail interaction of continuous weldedrails is complex under the load effect. Taking a double - tower steel truss cable - stayed bridge commonly used in railway as an example, the calculation model of longitudinal force for continuous welded rail on cable - stayed bridge was established based on the theory of bridge - rail interaction. The influences of the main tower temperature, stayed cable temperature, main tower stiffness, main girder rigidity and supporting system on the expansion and contraction force of rail were analyzed for providing the theoretical basis for the design of continuous welded rail on long - span cable - stayed bridge. Research conclusions ： ( 1 ) The research shows with the increase of main tower temperature, the expansion and contraction force decreases. The greater difference of main tower temperature, the vertical displacement of main girder mainspan is greater. (2) With the increase of stayed cable temperature, the expansion and contraction force increases little, but the vertical displacement of main girder main span decreases sharply. (3) The variation of main tower stiffness has little effects on the expansion and contraction force. (4 ) The expansion and contraction forces are almost in the same with floating system and half floating system. The expansion and contraction force in the left beam crevice of main girder is decreased when using the tower beam fixed support system and consolidation system， but the expansion and contraction force in the right beam crevice of main girder is increased. The two kinds of support system were not recommended to use on railway long - span cable - stayed bridge. (5) The research results can provide the design of continuous welded rail on long - span cable - stayed bridge.
		2015 Vol. 32 (12): 34-39 [Abstract] ( 2925 ) HTML (1 KB) PDF (855 KB) ( 2544 )

Bridge Engineering

	40	The Design for a 132 m Double Track Siimply Supported Steel Truss Beam of Guchengwan Main Bridge
		WU Wen – hua
		Abstract ： Research purposes ： Guchengwan bridge is the key project of the second double track railway from Jining to Baotou. The main bridge adopts a steel truss beam with 132 m span，which is controlled by terrain， structure height， site and so on. The main span is a simply supported steel truss spanning Beijing - Baotou railway with no vertical member, triangular flat chord and integral joint node. It is the largest span in double line ballasted railway simple - supported steel truss bridge when it has been finished. The paper gives some conclusions about structure，bridge deck selection，structure analysis，preventing brittle breaking under low temperature，and construction schemes on spanning the busy main railway. Research conclusions ： (1) Adopting longitudinal - transverse beam system and RPC ballast trough plate in bridge deck， not only could lighten deck weight，but also avoid difficulties such as late maintenance and replacement for the integral ballast trough plate. (2)The possibility of using simple supported structure could prevent the waste of using side span. (3) A reasonable plate thickness, design composition，weld distribution，stress control, and all of these methods could solve the problems about brittleness break of steel bridge under low temperate. (4 ) The main bridge employs parallel rotation with no balance weight construction schemes， which reduces the impact of the construction on the existing railway transport greatly. (5 ) The structure design， new bridge deck system and creative construction scheme in this bridge, may give clues on the same bridge s design and construction in the future.
		2015 Vol. 32 (12): 40-44 [Abstract] ( 2723 ) HTML (1 KB) PDF (949 KB) ( 2555 )

	45	Analysis of Seismic DesignSystem andEarthquake Resisting Methods of a High - speed Railway Heterotypic Arch Bridge
		SUN Da - bin,SHI Wei,LIU Xiang - jun
		Abstract：Research purposes： Aimed at the seismic design problem in designing the 11 Hongtaiyang" bridge which is a half - through heterotypic arch bridge in Changsha - Kunming Passenger Dedicated Line， reasonable seismic design system and effective earthquake resisting methods of the bridge were studied. Meanwhile， a longitudinal retainer simulated by a nonlinear spring element was set to ensure the bridged safety under earthquake action. The safety performance of the retainer was evaluated by calculating its seismic response. Research conclusions:( 1 ) Seismic response of piers is greatly reduced by using half float system which avoids designing coarser abutment piers. On the other hand， using sideling suspenders can effectively decrease longitudinal displacement of the half float system，and the results show that the seismic structure system is reasonable and reliable. (2) The longitudinal retainer commendably restricts the structure s longitudinal displacement under earthquake action. And the maximum stress of the retainer is less than its yield stress under the effect of design earthquake which means that the retainer is of enough strength and the structures service safety under earthquake action can be guaranteed. (3) The research result can provide reference for the seismic design of the same heterotypic arch bridge.
		2015 Vol. 32 (12): 45-50 [Abstract] ( 2632 ) HTML (1 KB) PDF (991 KB) ( 2497 )

	51	Analysis of Seismic Vulnerability and Adaptation of Simply - supported Girder Bridge on Sichuan - Tibet Railway
		YANG Ping,YANG Guo -jing,ZENG Yong – ping
		Abstract ： Research purposes ： Seismic damage reveals that railway bridges , the key structures in the transportation system , are vulnerable to earthquakes. The under - construction Sichuan - Tibet Railway will pass the Luhuo Earthquake Zone and the Yarlung Zangbo Earthquake Zone , and are thus designed to withstand 8. 0- magnitude earthquakes. The paper has analyzed the vulnerability and adaptability of 32 m- span simply - supported girder railway bridges of a typical structure and different pier heights in accordance with the Wenchuan Seismic Wave and the displacement ductility ratios as failure indexes , hoping to provide theoretical references and a basis for the anti - earthquake design of the bridges along the Sichuan - Tibet Railway. Research conclusions:(1 ) Analysis of seismic vulnerability indicates that: Sichuan - Tibet Railway bridges supported by 3 m - 40 m high piers can better resist earthquakes, and the slight damage probability is 18% when the peak acceleration of ground oscillation is 0. 35 g, except for those supported by 25 m - high piers that are most likely to be damaged in an earthquake. (2) Analysis results of adaptability indicates that： all piers, regardless of their height, have relatively good anti - seismic properties. Among the four damages shown in curve graphs, the slight and moderate damages are close to each other , and the moderate and severe damages are far from one another , indicating that the structure is ductile. (3) The research result has guiding significance to improve further anti - seismic designs, post - earthquake emergency response and bridge structure evaluation of railway bridges in southwest mountainous areas.
		2015 Vol. 32 (12): 51-52 [Abstract] ( 2661 ) HTML (1 KB) PDF (1143 KB) ( 2562 )

Tunnel Engineering

	53	Design and Practice of High and Steep Portals with Unsymmetrical Load of High - speed Railway Tunnels in Mountain Area
		HAN Hua - xuan, MA Zhi - fu
		Abstract ： Research purposes ： High and steep portals with unsymmetrical load of high speed railway in mountain area were prone to instability and collapse. How to safety into the tunnel was the focus and difficulty of the whole tunnel design. Taking design and practice of Hunan section tunnel on Shanghai - Kunming Passenger Dedicated Line as the background, this paper systematically studied the design concept and design principles in high and steep portals of unsymmetrical load. Meanwhile, this paper pointed out the integrated strengthening structural measures such as stay piles , protecting arch , ear - wall , prestressed anchor cable and frame beam , portal - structure and retaining structure , to ensure the safety of the bad tunnel portal. Research conclusions:( 1) Using the integrated strengthening structure - measures , such as stay piles , protecting arch , ear - wall , prestressed anchor cable and frame beam , portal - structure , retaining structure , strong supporting , can efectively solve the problems of the stability and safety of the high and steep portals with unsymmetrical load. (2) Using the design with inducing slope excavation and weak blasting and structural measures of organic combination such as portal , heading slope protection , retaining structure and local terrain and geological conditions , has been successfully applied to Hunan section tunnel portals on Shanghai - Kunming Passenger Dedicated Line and achieved the good effect. (3 ) The research results can be promoted and used when building the high and steep portals with unsymmetrical load of high - speed railway tunnels.
		2015 Vol. 32 (12): 53-62 [Abstract] ( 4855 ) HTML (1 KB) PDF (1168 KB) ( 2603 )

	63	Integral Method for Calculating Anti - overturning Stability of Railway Tunnel Portal Structure ^Hot!
		YU Yu1, ZHOU Jia - mei2, MENG Guo - wang2, CHANG Xiao - jing2
		Abstract ： Research purposes ： On the basis of analysis of the anti - overturning stability of end wall portal structure, integral method for calculating the anti - overturning of end wall portal structure system has been put forward. The research results can be a reference in theory and method for the design and code revising of railway tunnel portal. Research conclusions: Through this article research，such conclusions can be acquired: ( 1 ) The integral method considers the favorable effect that lining has a steady fixation effect on tunnel portal. The integral method is simple in computation, high in reliability and convenient for application. (2) The results show that resistive overturning safety factor is increased by 17.2% and the location of the applied points of resultant earth pressures raises 0. 92 m when using the integral method. Compared with the traditional calculation method, the integral method is more reliable, economical and reasonable. (3) The integral method is recommended in tunnel portal stability evaluation and design. Anti - overturning stability of all kinds of railway tunnel portal structure yet have not been studied, there are many issues need further study and discussion.
		2015 Vol. 32 (12): 63-69 [Abstract] ( 2920 ) HTML (1 KB) PDF (653 KB) ( 2615 )

	70	Prediction and Verification Analysis of Water Inflow for Daiyunslian Tunnel ^Hot!
		YIN Shi - qing
		Abstract ： Research purposes ： Daiyunshan tunnel is one of the high risk tunnels on Xiangtang - Putian Railway，and the correct prediction of water inflow^ is crucial to the tunnel design and construction. A kind of water inflow prediction method, which feathers for searching fissure water from steep dip angle in hard blocky rock tunnel with deep buried, has been developed on detailed comparison between site observed water inflow and the estimation water inflow that calculated by various methods during investigation stage. Research conclusions:( 1 ) The actual water inflow of Daiyunshan tunnel during construction corresponds with the predicted water inflow, which was obtained by using the water inflow calculation formula for partially penetrated well in steeply dipping phreatic aquifer from groundwater dynamics. This method has a prediction precision of 98.6%，and the ration of the sum of every water exits to the maximum water inflow predicted in the tunnel is 1.61. (2) The reason why the actual observed maximum water inflowexceeds the prediction value is that the most water inflow in initial stage is mainly from cracks, porosity and other static water. (3) The actual distribution of water gushing point has large different from investigation report. Hence，the high pressure fractured water，which stored in the vicinity of the secondary faults， plumose tension fissure around the compressional torsion fracture，should be paid attention to. (4)The research results can provide references for deep buried tunnel engineering investigation projects which feature for steep dip structural fissure water with hard rocky in railway, highway and hydro industries.
		2015 Vol. 32 (12): 70-75 [Abstract] ( 2747 ) HTML (1 KB) PDF (0 KB) ( 2477 )

Research on Railway Networks

	76	Simulation Analysis of Progressive Collapse for a Station
		TIAN Cheng - hao 1,DONG Cheng 1,LIU Ming 1,LI Jian - wei2
		Abstract：Research purposes： Communication Junction has intensive people and it is very possible to be attacked，so it is necessary to proceed progressive collapse analysis. To study the progressive collapse process of structures, a method to apply instantaneous load was adopted to simulate the progressive collapse of a station with a failed middle column at the first story by using the large deformation and dynamic finite element software LS -DYNA. Two cases of single - column failure and one case of double - columns failure were analyzed employing alternative path method according to the requirements of UFC 4 -023 -03. Research conclusions ： (1) This station is locally damaged for single - column failure cases, but the damage is confined within the limited area around the removed member. (2) For the double - columns failure case， the damaged area is obviously increased, but it is still confined in a limited area and will not induce the whole structure. (3 )The progressive collapse resisting capacity of steel structures can be remarkably improved by increasing the failure strain of the structural material. The structure has strong ability to resist progressive collapse. (4 ) The research results can provide a simple measure to evaluate the safety performance for such structure.
		2015 Vol. 32 (12): 76-79 [Abstract] ( 2870 ) HTML (1 KB) PDF (923 KB) ( 2533 )

Urban Rail Construction

	80	Comparison Analysis of Construction Sequence of Deep Foundation on the Deformation of Nearby Existing Subway Station ^Hot!
		XIANG Xian - hua
		Abstract ： Research purposes ： The excavation of deep foundation will induce differential deformation to the nearby existing subway station, whereas the deformation due to different construction sequence has not been generally investigated. The comparison analysis of construction sequence on the regular pattern of deformation for the nearby existing subway station was conducted, which was based on one field case located in Changsha and numerical analysis. The deformation characteristic of retaining structure and main structure of nearby existing subway station was also analyzed for the zone excavated using bottom - up method and top - down inverse construction method at different excavation depth. Research conclusions:( 1 ) The lateral deformation of retaining structure increased gradually with increasing the excavation depth. (2) The deformation of nearby existing subway station at the zone excavated using bottom - up method was obviously larger than that at the zone using top - down inverse construction method. ( 3 ) The surface settlement induced by excavation was smaller using top - down inverse construction method, whereas the surface settlements for different construction sequence were in the range of safety and normally use requirements. (4) The research results can provide references for the design and construction of deep foundation nearby existing subway station.
		2015 Vol. 32 (12): 80-85 [Abstract] ( 2655 ) HTML (1 KB) PDF (1508 KB) ( 2555 )

	86	Research on the Resource Sharing of Depot in Urban Rail Transit Network
		TIAN Jun - qin
		Abstract：Research purposes： With the development of the urban rail transit, the land resource along metro lines is becoming scarce while the value of land in comprehensive development and utilization is being enhanced. As a way to save land resource and investment, to make the resources of workshop and unwheeling repair in metro network rational allocated, the research on resource sharing of the vehicle depot is becoming more and more extremely urgent. In this paper , we research the resource sharing of the vehicle depot in the urban rail transit with the example of Tianjin , analyze and compare vehicle selection , connecting lines setting , land use of depot and time sequence of construction to give more detailed suggestions and guide the subsequent projects , and provide a reference to the similar construction of urban rail transit. Research conclusions: (1) Combining the actual situation of network planning and the constructions in progress，we will add three depots with function of workshop and unwheeling repair and nine new functional connecting lines in the total planned 9 rail lines of Tianjin rail transit. (2) The time sequence of construction of each line in metro network , the using conditions of land in depot and connecting line, and the consistency of vehicle selection are vital to resource sharing of the vehicle depot. ( 3 ) In order to save land resource and investment and guide the implementation of the metro network, we ned study the resource sharing in advance in the construction of urban rail transit. (4)The research results have the guiding significance to the research of the resource sharing scheme of the vehicle depot in the urban rail transit network.
		2015 Vol. 32 (12): 86-91 [Abstract] ( 2780 ) HTML (1 KB) PDF (1434 KB) ( 2563 )

	92	Research on the Forecast Metliods of Rail Transit Passenger Flow
		LIU Yang, CHENG Ming - ji
		Abstract ： Research purposes ： In the previous study of rail transit project, especially during the rail transit network plan，passenger flowis the key basis for determining the network structure and corridors alignment. However, for the traditional forecast method， the workload is huge， the model setup and calculation are complicated， and the time required is long，so it is difficult to push the project forward. This paper discussed how to estimate the total passenger flow and section passenger flow quickly based on the traffic survey， which can take the result in short time as an important reference for the rail transit project. Research conclusions: (1) Rail transit passenger flow forecast can be based on the residents'travel OD survey. (2) According to the trip chain analysis and the functional zone, the total passenger flow and maximum section passenger flow are estimated. (3) Comparing the calculation passenger flow by the method and the exact passenger flow of Tianjin Metro Line 1, there is a very small difference, so the method discussed in this paper is credible. (4) It can be used for the rail transit passenger volume forecast and network scale estimated during the network plan，and it helps to enhance the digitization and credibility of the plan work.
		2015 Vol. 32 (12): 92-96 [Abstract] ( 2781 ) HTML (1 KB) PDF (398 KB) ( 2717 )

	97	Adaptability Research on Addis Ababa Tramcars
		CAO Ke - fei, CHEN Shi - hao, CAO Hong - yu
		Abstract ： Research purposes ： Being a component of urban rail transit , modem tramcars have been showing up ai around the world. As the capital of Ethiopia , Addis Ababa has a large population , traffic jams and backward public transit facilities , thus urging the construction of urban rail transit with a large capacity. Although the modern tramcars made in China have already reached the advanced level of the world , crain improvements need to be made on the basis of ones running in China , so that the tramcars can meet all the special local topographic and climatic requirements. Research conclusions: (1) The tramcars made in China for Addis Ababa have advantages such as good pemomlance，a large passenger - capacity , high level of safety and comfort , impressive speed and convenience , efficiency on energy and low noise , flexibility in marshaling , being economical and practical. (2 ) As one type of moden plateau tramcar designed by China specially for Addis Ababa, all performance indices of it can meet the local topographic and climatic requirements. (3) The mooer tram transit in Addis Ababa , constructed with the aid of China , is the first urban rail transit among the regions of Easter and Sub - Saharan Africa. The successful operation of the tramcars designed for Addis Ababa will be a key to the door of African urban rail transit market , then paving a broad road for Chinese equipment to head towards Africa.
		2015 Vol. 32 (12): 97-102 [Abstract] ( 3018 ) HTML (1 KB) PDF (664 KB) ( 2575 )

Electrification Engrinnering

	103	Design for Technical Framework of Cooperative Control for IT Services of Railway
		QU Ji - cheng1, CHEN Xiao - jun2
		Abstract ： Research purposes ： As information technolo〇y matures, cooperative control of information technolo〇y service has become the new hot spot in the field of railway corp〇rate governance. From the perspective of expansion of the railway infrastructure construction and of improvement railway services value chain, this paper aims to propose the information technology services cooperative control framework which fits the characteristics of the railway enterprise in order to provide a reference for establishing a new information service governance structure. Research conclusions:(1) Build the railway enterprise IT services architecture committee to plan，guide and supervise the project of IT services in railway enterprise. (2) Use the SLA to prevent opportunistic behavior contract in the cooperative control of IT services in railway enterprise. (3) Introduce the COBIT for different priority levels of target location in the cooperative control of IT services in railway enterprise. (4) Implement services worth tracking mechanisms encourage stakeholders in the cooperative control of IT services in railway enterprise. (5) Make enterprise IT services transparent and effective in decision - making and reduce risk by using IT services cooperative control technology framework.
		2015 Vol. 32 (12): 103-110 [Abstract] ( 2646 ) HTML (1 KB) PDF (870 KB) ( 2458 )

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