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2023 Vol. 40, No. 12
Published: 2023-12-15
Energy Saving and Environmental Protection
Engineering Economy and Management
Main Line: Survey and Design
Main Line: Engineering Geology and Subgrade
Main Line: Railway and Rail
Terminal,Station yard and Building
Main Line: Bridge Engineering
Main Line: Tunnel Engineering
Main Line: Electrification Engineering
Main Line: Research on Railway Networks
 
       Main Line: Research on Railway Networks
1 Research on Changsha-Zhuzhou-Xiangtan Junction Connecting Scheme of High-speed Railway from Changsha to Jiujiang
PENG Yunfang
Research purposes: With the increasingly close connection between Changsha-Zhuzhou-Xiangtan urban agglomeration and two Yangtze River Delta urban agglomerations, the railway channel transport capacity of the Chang-Zhu-Tan urban agglomerations to the Yangtze River Delta is becoming increasingly saturated. The construction plan of the Changsha to Jiujiang high-speed railway will provide a new fast channel for the above two areas, and effectively solve the problem of insufficient transport capacity of the Shanghai-Kunming and the Beijing-Guangzhou high-speed railway. In this research, it is intended to realize the scientific introduction of the Chang-Zhu-Tan hub of the Changsha-Jiujiang high-speed rail, and reasonably determine the arrangement of the track contact points and contact lines of the Chang-Zhu-Tan hub.
Research conclusions: (1)Section of Changsha-Ganzhou Railway from Huanghua Airport Station to Changsha West Station integration plan make full use of Changsha-Ganzhou railway project in Chang-Zhu-Tan hub, and can connect with major stations within the hub and flexible routing within the hub.(2)Through the "T" shaped connection line, the traffic flow of the Changsha-Jiujiang high-speed railway can be shunted to the south and west of Changsha in time, and the line capacity of the Changsha-Ganzhou railway section in the hub can be balanced, so as to avoid tension inindividual sections.(3)The project investment and construction difficulty are relatively small, so it is recommended. (4)The new high-speed railway introduces the existing railway junction, which has great influence on the operation of the existing ballastless track line and is difficult to construct. In order to minimize the impact of future construction on operations and reduce abandoned works, it is recommended that the Changsha-Jiujiang high-speed railway be planned as soon as possible and reasonably reserved.(5)The research results can provide reference for similar new lines to be introduced into railway junction projects.
2023 Vol. 40 (12): 1-5 [Abstract] ( 5 ) HTML (1 KB)  PDF  (1593 KB)  ( 0 )
       Main Line: Survey and Design
6 Design Method of Whole-process Deformation Control for Approaching Construction of Urban Deep Space
HUANG Zhenke, DONG Jun, ZHU Yong, YU Qunding, XIE Jun
Research purposes: The development and utilization of urban deep (50 m deep) underground space faces the problem of multi-chamber close construction, and the stability and deformation control requirements are more stringent than those of conventional underground space. There is still no systematic design method to guide engineering practice. Therefore, a whole-process deformation control design method for the deep urban near-grounded space is proposed.
Research conclusions: (1)Based on the research results of the deformation mechanism of geography, existing chamber and new chamber by close excavation of multiple chambers, the principle of deformation control of proximity construction is proposed, the design process of deformation control of the whole process of close connection of urban deep underground space is established, the control standards of construction deformation (including rock and soil deformation) and structural deformation of chamber are given, and the risk zoning standard of proximity considering the type of close connection, the grade of surrounding rock and the spacing of close connection is proposed.(2)Starting from the aspects of construction method, geotechnical deformation control, deformation control of existing structures, stability and deformation control of new structures, the deformation control design suggestions under typical strata and risk zoning conditions are proposed for typical close connection types.(3)The design method is applied to the typical deep proximity project of Fuxie section of Chongqing Metro Line 18, and the results show that the design scheme given according to this method can effectively control the deformation of the deep proximity project, ensure the stability of the new chamber. The deformation of the existing chamber is within the range specified by the standard, which can be used to guide the design of the close connection deformation of the deep underground space in the city, and has the value of promotion and application.
2023 Vol. 40 (12): 6-14 [Abstract] ( 5 ) HTML (1 KB)  PDF  (1741 KB)  ( 0 )
15 Problems and Measures of Operating EMU in Existing Mixed Passenger and Freight Railway
DING Ruosi
Research purposes: With the rapid development of economy, society and railway transportation, the transport capacity and travel speed of existing railways need to be further improved to meet the social demand, especially to fully tap the potential value in high-quality railway transportation. The improvement of the transport quality of existing railways and the adaptive transformation are important research fields for the country. This paper focuses on the Xining - Golmud section of the existing Qinghai-Tibet Railway, studies the problems of the electric phase insulator by the operation of EMU trains, and proposes relevant measures to overcome the original operational difficulties and meet the requirements of high-quality transportation and relevant safety regulations.
Research conclusions: (1)After analysis and calculation, by adjusting the electric phase insulator and the signal, and softening the slope, the operation problems caused by the existing railway electric phase division can be solved.(2) In-depth analysis shows that both the adjustment of electric phase insulator and the softening slope have the problems of large investment, difficult construction, and easy to cause other operational problems such as land use. Combined with factors such as engineering economy and operational requirements, the method of comprehensive adjustment or removal of the signal is more feasible and appropriate.(3) This study proposes theoretical analysis and selects the Xining - Golmud section of the Qinghai-Tibet Railway as an example, aims at the research on supporting facilities required for the adjustment of electric phase insulator, which provide theoretical basis for the subsequent operation of EMU on existing railways. The paper has a certain guiding significance.
2023 Vol. 40 (12): 15-18 [Abstract] ( 3 ) HTML (1 KB)  PDF  (644 KB)  ( 0 )
19 Research and Application of Cross-hole Seismic Technology in Detailed Karst Detection
LIU Zhenming
Research purposes: Cross-hole seismic technology plays an important role in the precise detection of karst in urban underground space, and is an important guarantee for the safety of urban underground space. However, it has been proven that cross-hole CT technology still has limitations such as large deviation in the identification of karst near the bedrock surface, missing of small cavities, and inability to detect large inclined interfaces or vertical banded karst caves. Based on cross-hole seismic CT technology, this paper introduces cross-hole seismic migration technology, and achieves good results in the trial calculation of diffraction model and karst cave model. The aim of the research is to apply cross-hole seismic migration technology to engineering practice, improve the degree of fine detection of karst and ensure the safety of major engineering construction.
Research conclusions: (1)Cross-hole seismic migration technology can perform migration imaging on fine structures with arbitrary velocity changes, and the imaging results can accurately reflect the structural morphology, with higher resolution, which is feasible and superior in karst exploration.(2)In the engineering field, the cross-hole seismic migration technology has been implemented for the first time, effectively compensating for tomographic imaging errors caused by factors such as ray errors in cross-hole seismic CT technology, as well as improving the detection accuracy of karst spatial morphology.(3)The implementation of cross-hole seismic migration technology provides a theoretical basis for multi-attribute interpretation of cross-hole seismic data, which can reproduce the morphology and scale of karst development more realistically and provides a new idea for carrying out cross-hole seismic work in karst areas, with scientific significance and promotion value.
2023 Vol. 40 (12): 19-24 [Abstract] ( 6 ) HTML (1 KB)  PDF  (2533 KB)  ( 0 )
       Main Line: Engineering Geology and Subgrade
25 Study on In-situ Stress Simulation and Disaster Interpretation in Structural Development Area
LI Guosheng
Research purposes: With the continuous extension of China's road network, its construction area gradually tends to be structurally developed, difficult and complex mountainous areas. With the strong tectonic movement, this kind of construction area is pregnant with complex in-situ stress state. Rock burst and large deformation are inevitable in deep buried engineering rock mass. It is necessary to fully rely on the measured in-situ stress data and carry out numerical simulation analysis to obtain the three-dimensional in-situ stress state of the engineering environment from point to surface. After that, according to the early construction projects in such areas, the data of rock burst and large deformation are revealed, and the data of survey and design stage and construction stage are compared and analyzed. Finally, reasonable and effective suggestions for the analysis and determination of rock burst and large deformation of soft rock are put forward.
Research conclusions: (1)With the extremely complex stress state, the deep buried tunnel project is easy to produce rock burst under the condition of hard rock, and it is easy to produce large deformation under the condition of broken soft rock.(2)Based on the representative in-situ stress test results, the inversion analysis of the in-situ stress field of the site by numerical simulation is an effective and feasible method to comprehensively analyze the in-situ stress characteristics of the site.(3)Based on the limited in-situ stress test data, relying on the geological survey data of the region, combined with the topography, lithology and related structures, the numerical model is constructed based on the finite element method, and the three-dimensional in-situ stress data of the tunnel site area is finally obtained. Through the comparative analysis of the simulated data and the measured data, it is verified that the data are in good agreement. At the same time, the characteristics of ground stress in the tunnel site are revealed.(4)The analysis and judgment of rock burst and large deformation need to be appropriately corrected based on the empirical data after the completion of the actual project. By comparing and analyzing the differences between the actual results of the construction stage and the predicted results of the survey and design stage, the analysis and judgment criteria closer to the engineering experience are proposed. These criteria can be used as reference for the investigation and design of similar projects in the future, so as to reasonably control the engineering risk and investment.
2023 Vol. 40 (12): 25-29 [Abstract] ( 4 ) HTML (1 KB)  PDF  (762 KB)  ( 0 )
30 Study on Movement Characteristics of Debris Flow in Cuojiu Gully and Assessment of Its Engineering Impact
GE Chao
Research purposes: The Yarlung Tsangpo River basin is located in the active tectonic zone between the Indian Plate and the Eurasian Plate. Its unique geological background, complex topography, and diverse climate zones contribute to large-scale, high-speed, and sudden debris flows in this region. The Cuojiu Gully debris flow is a valley located in the upper reaches of the Yarlung Tsangpo River basin. This article analyzes and evaluates the disaster-prone environment, geometric characteristics, and motion parameters of this valley to provide technical support for downstream projects and serve as a reference for impact assessment of other similar debris flow projects in mountainous areas.
Research conclusions: (1)The comprehensive analysis of the history of debris flow activity, climate characteristics, geological conditions of the main channel, topographic conditions of the basin, material source and water sourceconditions shows that the Cuojiu Gully has the conditions for the outbreak of super-large rainstorm debris flow. (2)Based on the quantitative scoring method of debris flow susceptibility and the grain size distribution analysis method of deposits, the bulk density of the debris flow in Cuojiu Gully is determined to be 1.76 g/cm3 under the condition of 100-year return period, and it is determined that the debris flow in Cuojiu Gully is a dilute debris flow. Under this condition, the velocity, peak discharge, overall impact force of debris flow, impact force of block stone, primary total6amount and primary maximum accumulation thickness of debris flow in Cuojiu Gully are 2.5 m/s,1 043.94 m3/s,11 kPa,41.70 kN,148.76×104 m3 and 12.31 m, respectively.(3)The evaluation results of the susceptibility,development stage,activity intensity and risk of debris flow in Cuojiu Gully show that the debris flow is in the "development stage (prime stage)", the susceptibility level is "easy to occur", the activity intensity is "very strong", and the risk of debris flow is "high risk".(4)Under the 100-year return period condition, the maximum impact height of debris flow at 160 m downstream of the gully is 13.22 m, and the impact width is about 620 m.(5)The evaluation result of the impact of debris flow gully on the line scheme based on this method can be used as an important basis for line optimization and project setting in complex mountainous areas.
2023 Vol. 40 (12): 30-35 [Abstract] ( 5 ) HTML (1 KB)  PDF  (2297 KB)  ( 0 )
       Main Line: Railway and Rail
36 Design of Ballastless Track System for Padma Bridge Rail Link
YANG Wenmao, LIN Hongsong, XU Hao, DAI Feng
Research purposes: Padma Bridge Rail Link Project is the first railway in Bangladesh to lay ballastless track. It is also the first time for Chinese engineers and technicians to carry out the design of ballastless track on long-span steel truss girder and ballastless turnout on simply supported beam under the condition of 120 km/h speed and 25 t axle load mixed passenger and freight railway. The design faces a series of challenges such as limitations of both clearance space and track weight, 2 350 mm ultra-wide beam seam and 7.5‰ ultra-large beam-end rotation angle, and the layout of seamless turnout groups with ballastless track on simply supported beams. So it is urgent to carry out systematic research on track structure and components to guide track construction.
Research conclusions: (1)A single-layer long sleeper embedded ballastless track with integrated design of base plate and bridge deck is proposed to solve the problem of clearance space and track weight limitation on large span steel truss bridge.(2)An integrated device of bridge movement joint and rail expansion joint is developed with design expension of ±800 mm to solve the problem of adaptive adjustment for track structure under the condition of 2 350 mm wide beam seam and 7.5‰ beam-end rotation angle.(3)Based on the "turnout-beam-pier" integrated calculation model, the interaction analysis between turnout and bridge is carried out to solve the design problem of seamless turnout groups with ballastless track on simply supported beams under 25 t axle load.(4)The above innovative practice has guided construction of the first ballastless track in Bangladesh, which has a certain reference value for the design of ballastless track on complex bridge structures in overseas projects.
2023 Vol. 40 (12): 36-40 [Abstract] ( 5 ) HTML (1 KB)  PDF  (1388 KB)  ( 0 )
       Main Line: Bridge Engineering
41 Research on Seismic Performance of New Type Railway Ductile Structure Pier in Strong Earthquake Area
ZENG Yongping, DONG Jun, LIU Liwei
Research purposes: In order to ensure the safety and smoothness of train operation, the high speed railway bridge piers are often large in size and stiffness, which makes it difficult for the pier to form the plastic hinge at the bottom of the pier under the action of strong earthquake, and the seismic force of the pile foundation at the bottom of the pier is too large, which is easy to damage the pile foundation, and the pile foundation design is not economical. Therefore, it is urgent to carry out the research on the new ductile structural pier, so as to reduce the earthquake damage to the piers and pile foundation and improve the seismic performance of the round end pier on the premise of ensuring the operating stiffness. In this paper, two types of ductile structural pier design schemes were proposed. Xtract nonlinear analysis software was used to study the seismic performance of the pier base section and analyze the influence of different design parameters on the key seismic performance indexes of the pier. The developed ductile structural pier meets the operational rigidity requirements of railway bridges and can reduce the seismic force by 30% ~ 50% under strong earthquakes.
Research conclusions: (1) The proposed design scheme of ductile structural pier of high-speed railway realizes that the stiffness and strength of ductile structural pier are the same as that of the original bridge pier under normal operation and small earthquake action, and the first yield moment is 0.85 ~ 1.05 times of the original bridge, so as to ensure the train running safety. The stiffness of the ductile structure pier decreases under the action of strong earthquake, the maximum seismic force at the bottom of the pier is 0.5 ~ 0.7 times that of the original pier, and the ductility ratio of the pier is 1.4 ~ 1.9 times that of the original bridge, which realizes the design goal of the ductile pier and protects the pile foundation.(2)The equivalent yield moment and ultimate moment of the new ductility pier are positively correlated with the area ratio of rebar after internal shrinkage.(3)With the increase of mortar strength, the initial yield moment and equivalent yield moment of pier section will gradually increase, but the ultimate bending moment of pier section is not affected by mortar strength.(4)The research result can provide a reference for the seismic design of railway pier in strong earthquake area.
2023 Vol. 40 (12): 41-47 [Abstract] ( 4 ) HTML (1 KB)  PDF  (2021 KB)  ( 0 )
       Main Line: Tunnel Engineering
48 In-situ Stress Characteristics and Rockburst Risk Evaluation of a Tunnel in the Southwest Mountains
ZHOU Hang, ZHANG Guangze, ZHAO Xiaoyan, CHEN Shikuo, XIE Rongqiang, LIN Zhiheng, LI Jiayu, SHEN Wei
Research purposes: The granite tunnel in the southwest mountainous area is located in the Yarlung Zangbo River suture zone, the geological conditions are extremely complex and the regional tectonic action is strong, and the risk of high geo-stress and rockburst disaster in tunnel construction is extremely significant. According to the regional geological data, combined with the measured in-situ stress data of the nearby engineering area, the numerical calculation model of the tunnel was established by COMSOL, the initial in-situ stress field of the tunnel site area was analyzed by the boundary load adjustment method, the in-situ stress characteristics was studied, and the rock burst hazard level of the granite tunnel was discussed.
Research conclusions: (1)The maximum horizontal principal stress SH of the granite tunnel axis is 5.1~33.5 MPa, the vertical principal stress Sv is 4.2~55.1 MPa, and 80.48% of the area along the tunnel is in the state of high to extremely high in-situ stress.(2)When the tunnel depth is less than 600 m, the granite tunnel is mainly dominated by horizontal tectonic stress, the stress field type is mainly SH>Sv>Sh, and the stress structure is strike-slip type.When the tunnel buried depth exceeds 600 m, the vertical principal stress of large buried depth begins to dominate, and the stress field type is mainly Sv>SH>Sh, indicating that the stress structure is a positive fault type.(3)The granite tunnel strata are mostly hard and brittle surrounding rocks of grade Ⅱ and Ⅲ. According to the test results of rock elastic energy index and brittleness coefficient, the medium grain amphibolite black cloud granite has the energy storage and energy release conditions of medium rockburst tendency.(4)Based on the evaluation method of the maximum initial stress value Smax and the rock strength stress ratio Rc/Smax, the total length of the granite tunnel is 13 047 m, and the risk section of strong and extremely strong rockburst is 9 000 m, accounting for 68.98%.(5)The research conclusion of this paper can provide data support for the investigation and design of deep-lying long tunnel and rockburst disaster prevention in complex mountainous areas under similar geological conditions.
2023 Vol. 40 (12): 48-54 [Abstract] ( 8 ) HTML (1 KB)  PDF  (1903 KB)  ( 0 )
55 Evaluation Method for TBM Adaptability of Extra Long Tunnels
GUO Limin
Research purposes: Through the investigation of existing TBM construction cases at home and abroad, combined with the development of TBM equipment and the improvement of construction level in recent years, the measures taken by open TBM to deal with various adverse geological problems were analyzed and studied, and the adverse geological engineering measures of TBM to deal with extremely hard rock, rock burst, large deformation of soft rock, fault fracture zone, water inrush and auxiliary tunnel conditions and the adaptability of TBM were evaluated, and a quantitative evaluation method for TBM adaptability was proposed.
Research conclusions: (1)Through the analysis of the case, the adaptability evaluation of TBM through extremely hard rock, rock burst, large deformation of soft rock, fault fracture zone, water and mud inflow and other adverse geology is obtained.(2)Combined with the investigation and analysis of the existing special tunnel auxiliary tunnel scheme, the auxiliary tunnel condition coefficient is proposed, and the auxiliary tunnel conditions are quantitatively evaluated.(3)The evaluation coefficients of TBM adaptability are quantified under various types of adverse geological conditions.(4)Combined with the auxiliary tunnel conditions and the adaptability of adverse geological TBM, the TBM selection principle is proposed, and the existing TBM tunnel project is evaluated, showing that the TBM selection principle has good applicability.(5)The research results can be applied to the adaptability evaluation of TBM construction method for super long tunnels in mountainous areas.
2023 Vol. 40 (12): 55-60 [Abstract] ( 4 ) HTML (1 KB)  PDF  (368 KB)  ( 0 )
       Main Line: Electrification Engineering
61 The Influence of the Five Span Overlap Contour Point on the Performance of the Pantograph-catenary
DENG Hong
Research purposes: As the core part of overhead contact system, the design concept of the overlap plays a crucial role in the pantograph-catenary current collection. When designing the five span overlap of the overhead contact system, a certain height of the roof ridge is usually reserved at the transition point between the two supports to reduce the pressure on the pantograph and catenary, however, there is currently no clear requirement for the lifting amount of the contour point, and its size also affects the current collection performance of the pantograph and catenary.In severe cases, it may affect the safety of train operation. Therefore, studying the influence of the contour point position of the five span overlap joint on the lifting amount of the contact line and the contact pressure between the pantograph and the catenary is of great significance for improving the current collection quality of the catenary and ensuring the safety of high-speed railway operation. In this paper, theoretical analysis, the simulation of pantograph-catenary and other means are used to study the impact of the height of the five span overlap contour point of the overhead contact system with a speed of 350 km/h on the overall pantograph and catenary performance.
Research conclusions: (1)The lifting amount of contact wire, pantograph catenary contact force and standard deviation of contact force when the rear pantograph passes are far greater than the lifting amount of contact wire, pantograph catenary contact force and standard deviation of contact force when the front pantograph passes.(2)The maximum lift of the contact wire and the minimum contact force between the pantograph and the catenary generally occur near the contour points of the overlap. The main reason is that the two conductors at the contour point are lifted. Due to inertia, the contact line of the pantograph will be lifted significantly for a short time after passing through the roof ridge, and the contact force will be reduced instantaneously.(3)The elevation of the five span overlap of the high-speed railway overhead contact system with a speed of 350 km/h can be selected in the range of 30 mm to 60 mm, but the elevation of the contour point is between 30 mm and 40 mm when the current collection of the pantograph and catenary is optimal.(4)The research results of this paper are applicable to the professional field of electrified railway overhead contact system.
2023 Vol. 40 (12): 61-65 [Abstract] ( 4 ) HTML (1 KB)  PDF  (1399 KB)  ( 0 )
66 Research on Precise and Collaborative Reactive Power Compensation Based on Regenerative Braking Device
MA Deming
Research purposes: The reactive power compensation of urban rail transit is an important aspect of power supply system design, which is directly related to system economy and reliability. However, the current equipment selection and application in the industry have not been closely combined with engineering characteristics. Through this study, this paper proposed the principle of rational configuration of reactive power compensation devices and an optimization plan for collaborative compensation using regenerative braking devices under centralized power supply mode.
Research conclusions: (1)The reactive power compensation scheme for urban rail transit needs to be designed specifically in combination with the gateway metering point and the structure of the system.(2)Based on the iterative algorithm of reactive power measurement, using multiple medium-voltage inverter-based regenerative braking devices to cooperate, the technical feasibility of realizing the precise reactive power compensation scheme in the form of fixed compensation is verified through practice, effectively realizing the reuse of equipment and reducing the investment in engineering construction.(3)The scheme of using regenerative devices for precise reactive power compensation can be applied to urban rail transit power supply system.
2023 Vol. 40 (12): 66-71 [Abstract] ( 3 ) HTML (1 KB)  PDF  (1201 KB)  ( 0 )
72 Study on the Foundation of Railway Electrification Catenary in Permafrost Region
WANG Qiang
Research purposes: In recent years, the demand for building railway electrification in permafrost region has become increasingly urgent. Railways in permafrost region have the characteristics of many long and steep slopes, high train power, and high soil resistivity, which can easily cause an increase in rail potential, endanger personal and facilities safety, and driving safety. In order to reduce the rail potential in permafrost region, a railway in the western region is taken as the research object. According to the characteristics of the subgrade and soil, the grounding resistance of a single pillar foundation is calculated, and the rail potential of the traction power supply system is analyzed under the combined action of multiple pillars in the power supply arm to find a design scheme to solve the grounding problem of railway electrification in permafrost region.
Research conclusions: (1)Electrically connect the catenary pipe pile foundation along the line with the rail to form a current path of rail pile earth, which can reduce the rail ground leakage resistance and inhibit the maximum rail potential.(2)After the pillar foundation is incorporated into the earthing system, the maximum rail potential can be reduced by 26.9%. After adding a dedicated grounding electrode to the foundation, the maximum rail potential can be reduced by 34.6%.(3)The results of this study can provide reference for the grounding design of traction power supply systems with high soil resistivity.
2023 Vol. 40 (12): 72-77 [Abstract] ( 4 ) HTML (0 KB)  PDF  (896 KB)  ( 0 )
       Terminal,Station yard and Building
78 Planning Study of Comprehensive Hubs for Railway Passenger Stations Based on Transport Integration
TIAN Hong
Research purposes: In response to the problems of insufficient coupling between traditional railway passenger station hub layout planning and urban functions, insufficient consideration of transportation integration, and insufficient consideration of urban transportation carrying capacity, this paper conducts in-depth exploration of the planning principles and transportation hub layout planning dimensions, and obtains the optimal transportation hub layout planning results.
Research conclusions: (1)The planning principle should follow the concept of coordinating with the regional development pattern, coordinating with the overall urban planning, and reasonably dispersing the layout of passenger transport hubs in various directions of the city.(2)The layout planning of transportation hubs should be humanized and characterized, and the collection of internal transportation organization and transportation system elements should be constructed.(3)By analyzing and demonstrating the outside urban transportation and inside city transportation space of integrated transportation hub, not only design process can be simplified based on the basic needs of passengers but also efficiency and comfort level of service will be improved significantly. Consequently, the layout planning proposed in this way is the most reasonable.(4)The research conclusion can serve as a reference for the planning of railway passenger station hubs.
2023 Vol. 40 (12): 78-82 [Abstract] ( 5 ) HTML (0 KB)  PDF  (1052 KB)  ( 0 )
83 Research on the Layout of EMU Supporting Facilities in Xi'an Railway Hub
WANG Jun
Research purposes: Xi'an Railway Hub Planning (2016-2030) was first approved by the whole railway. At present, there are still some problems that EMU supporting facilities capacity is insufficient and imbalance. It is necessary to improve transportation efficiency, reduce cost and increase efficiency and promote high-quality railway development on the basis of the overall planning of the hub and in combination with the requirements of EMU repair system reform in recent years, comprehensively sort out the EMU supporting facilities in the hub, find out the possible problems in the future through capacity analysis, and put forward adjustment and optimization suggestions for the layout of EMU supporting facilities in the hub, so as to improve the utilization rate of supporting facilities and maximize the efficiency of transportation organization.
Research conclusions: (1)The EMU maintenance facilities at Xi'an station need to be coordinated and utilized byrelevant EMU section in the hub, and storage facilities should be configured in conjunction with EMU operation. (2)Xi'anbei EMU depot and Xi'anbei EMU section undertake the EMU maintenance needs of other stations. On the basis of existing passenger train technical servicing equipment, Xi'an railway station will add EMU supporting facilities. Xi'andong EMU section will be expanded in a timely manner as needed in the long term. The new Xi'annan railway station needs to be built and equipped with a reserved EMU section.(3)The research result can provide a reference for optimizing layout in other railway hubs across the country.
2023 Vol. 40 (12): 83-87 [Abstract] ( 4 ) HTML (0 KB)  PDF  (1033 KB)  ( 0 )
88 The Construction of Railway Station Standardization System Based on BIM Forward Design
WENG Kai, LI Junsheng
Research purposes: IM forward design is the key point for the digital transformation of design institutes. However, there are some problems in the implementation and popularization of railway stations. Standardization helps to standardize the application of BIM technology in design institutes, and plays a guiding role in promoting the technical development of BIM forward design. Starting from standardization, this paper constructs a BIM forward design standardization system for railway stations from five aspects: design standard guidance, standard design process, standard design resources, standard design calculation and standard design application.
Research conclusions: (1)The well-developed BIM forward design standardization system is an important factor for the promotion and application of BIM technology in design institutes, which is helpful to improve the level of BIM design and application.(2)The research has realized standardized applications such as standard components, standard detail family, standard modeling depth, standard view template, standard professional requirement format, and standard view browser, which formed a whole process solution from modeling, calculation, professional requirements, drawing, engineering quantity statistics, and visual application.(3)The application in Linghai South Railway Station realizes the standardization of whole process, the design quality and efficiency is improved and the experience is reused in other projects.(4)The research results can provide reference for BIM forward design promotion and standardization of railway stations.
2023 Vol. 40 (12): 88-94 [Abstract] ( 4 ) HTML (0 KB)  PDF  (3461 KB)  ( 0 )
       Energy Saving and Environmental Protection
95 Analysis on Ground Vibration Properties Induced by Underground High-speed Railway Based on In-situ Experiment
DAI Feng, YANG Jizhong, BI Lanxiao, LIU Yutao
Research purposes: The transportation intersection form of railway under-passing transportation hub gradually becomes popular, the ground vibration due to the underground railway cannot be ignored. In order to determine the influence law of the operation of the underground high-speed railway on the ground vibration, according to engineering project of the high-speed railway underpassing the airport site under construction, the dropping-wheel test was conducted in the high-speed railway tunnel to obtain the vibration properties of the surrounding soils. And the semi-analytical calculation model of the vehicle-track-tunnel-ground layer was established to obtain the dynamic initial conditions of the vehicle loads. The amplitude-frequency characteristics and transmission law of the ground vibration induced by the underground high-speed railway were analyzed and the effects of the different vehicle speed, track parameters and tunnel burial depth were discussed.
Research conclusions: (1)The ground vibration decays significantly within 10 m from the centerline of the railway line with the attenuation rate of 70%. The vertical vibration amplitude is significantly larger than that of the other two directions. The lateral amplitude is the smallest with the slowest decay rate.(2)Under the condition of 350 km/h for the high-speed railway, the vertical and lateral ground vibration within 80 m reaches 20~80 dB and 43~72 dB respectively. The maximum attenuation coefficient of Z-vibration level reaches 0.276 dB/m.(3)The Z-vibration level of the ground increases by about 2 dB with the vehicle speed increasing by 50 km/h.(4)The smaller fastener stiffness leads to the larger ground vibration within 13~50 Hz, while the ground vibration is positively correlated with the fastener stiffness above 79 Hz.(5)When the tunnel burial depth is larger than 14 m, the tunnel burial depth has little influence on the change of the Z-vibration level of the ground, so the ground vibration can be reduced by limiting the burial depth of the high-speed railway tunnel to a reasonable range.(6)The research achievements can provide a reference for the design and research of the under-passing high-speed railway.
2023 Vol. 40 (12): 95-101 [Abstract] ( 5 ) HTML (0 KB)  PDF  (1767 KB)  ( 0 )
102 Experimental Study on Green Protection of Steep Slope of Mountain High-speed Railway Subgrade
WANG Xiang
Research purposes: In railway engineering construction, it is difficult to have a good green protection form for steep subgrade slope, such as the slope which rate steeper than 1∶1. In view of the difficult problem of green protection for steep slope of subgrade of high-speed railway in mountain area, two new types of subgrade slope supporting structures, namely pre-reinforced frame anchor rod with embedded base material (eco-bag) and composite anchor wall with embedded base material (eco-bag) , were designed, and field test was carried out to verify its applicability.
Research conclusions: (1)The deep deformation of the embedded slope in the anchor rod of the pre-reinforced frame decreases gradually from the top of the pile to the bottom, and the maximum deformation of the top of the pile is less than 35 mm.(2)The stress of the anchor rod of the pre-reinforced frame is about 1/5~1/7 of the designed value,the soil arching effect of the pre-reinforced pile is obvious, which greatly reduces the force on the anchor rod of the frame in front of the pile.(3)The anchoring force of the composite anchor wall is about 1/2 of the designed value, and the deep displacement behind the anchor wall is less than 35 mm.(4)The improved thick layer base material (ecological bag) has good effect of green ecological protection. The survival rate of plants is more than 90%, and the coverage rate of plants is more than 85%, the green protection of the whole slope with the slope ratio of 1∶0.5 is realized.(5)The results of this study can provide reference for the protection of subgrade steep slope greening.
2023 Vol. 40 (12): 102-107 [Abstract] ( 5 ) HTML (0 KB)  PDF  (1350 KB)  ( 0 )
       Engineering Economy and Management
108 Analysis of Influencing the Performance of Railway EPC Projects Embedded in the Unit Price Construction
LIANG Tao, XIAO Chang, HUO Tengfei
Research purposes: The application of unit price contracting to railway projects has gradually become the focus of the industry. To improve the performance of railway EPC projects under the framework of unit price subcontracting, it is necessary to investigate the influencing factors and clarify the causal relationships and influence mechanism among the factors.
Research conclusions: (1)The 23 representative factors are identified through grounded theory method.ThroughDEMATEL-ISM model, the 23 influencing factors are divided into 11 cause factors, 12 effect factors and 7 levels. (2)The causal relationship and impact mechanism among factors are deeply explored, and the most fundamental factors that affect the performance of railway EPC projects are identified.(3)This paper can provide references to the application of unit price contracting to railway EPC projects for improving the performance.
2023 Vol. 40 (12): 108-113 [Abstract] ( 6 ) HTML (0 KB)  PDF  (649 KB)  ( 0 )
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