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2023 Vol. 40, No. 2
Published: 2023-02-15
Main Line: Engineering Geology and Subgrade
Main Line: Railway and Rail
Main Line: Bridge Engineering
Main Line: Tunnel Engineering
Main Line: Electrification Engineering
Urban Railway Development and Technology Research
 
       Main Line: Engineering Geology and Subgrade
1 Simulation of Dangerous Rock Movement and Risk Zoning Based on UAV Model
ZOU Yang, LIU Yi, LI Jianqiang, FENG Tao, ZHANG Guangze, ZOU Fei
Research purposes:The Jinsha River area at the southeast edge of the Qinghai-Tibet Plateau is characterized by high elevation, frequent crustal activity, broken rock mass, large coastal topographic relief and high dangerous rock development. The traditional geological survey means are hard to reach by manpower, with high safety risks and low efficiency. Therefore, it is urgent to carry out relevant research and practice on non-contact measurement, motion simulation and risk zoning technology, and explore a set of dangerous rock and rockfall investigation and risk assessment analysis system suitable for plateau and mountain areas.
Research conclusions:(1) In view of the adverse environmental factors such as high altitude, low temperature and low oxygen, undulating terrain, high wind speed and so on, the non-contact UAV platform and fine modeling technology have been selected to replace the traditional survey work mode in the plateau mountain area. (2) The real terrain surface features of high steep slope and high dangerous rock fall area are obtained, which can realize the interpretation and identification of high dangerous rock and rockfall on high steep slope, quantitative extraction of geometric information of rock mass structure, 3D rolling motion simulation and feature analysis, and temporal and spatial risk zoning of rockfall. (3) Through a large number of application practices, this new survey and evaluation system can greatly improve the survey accuracy and efficiency, ensure the safety of survey, design and construction, and the research results can provide reference for the survey work in plateau and mountain areas.
2023 Vol. 40 (2): 1-5 [Abstract] ( 2697 ) HTML (1 KB)  PDF  (1269 KB)  ( 1261 )
6 Measurement and Control of Long Wave Track Irregularity of Long-span Suspension Bridge on High-speed Railway
ZHANG Jian, LONG Xuyou, WANG Huiyong
Research purposes:The Wufengshan Yangtze River Bridge on the Lianyungang-Zhenjiang Railway is the world's first steel truss girder railway suspension bridge. When the current vector distance difference method is used to measure the static high and low long-wave irregularity of the track, it does not meet the specification limit standard. On the basis of analyzing the existing static measurement methods of track irregularity, according to the characteristics of Wufengshan Yangtze River Bridge, the method of combining theoretical analysis and measured data is used to propose a long-span railway suspension bridge measurement method and control standard for track irregularity, which provides technical support for bridge acceptance and maintenance.
Research conclusions:(1) It is recommended to use 60 m chord length continuous midpoint chord measurement method to measure the long-wave irregularity of the Wufengshan Yangtze River Bridge track. (2) The static long-wave irregularity of Wufengshan Yangtze River Bridge is controlled according to the four-level standards of operation acceptance, regular maintenance, planned maintenance, and temporary repair. The limit values of irregularity at 250 km/h are 10 mm, 12 mm, 20 mm and 28 mm respectively. (3) Under the condition of temperature load fitting longitudinal section, the maximum chord length irregularity of Wufengshan Yangtze River Bridge is 10 mm, which meets the requirements of operation acceptance limit. (4) It is recommended to strengthen operation monitoring, further carry out special research on bridge and line maintenance, and formulate targeted maintenance rules and standards.(5) The research results can be applied to the survey, design, acceptance, operation and maintenance of long-span suspension bridges on high-speed railways.
2023 Vol. 40 (2): 6-11 [Abstract] ( 2725 ) HTML (1 KB)  PDF  (1981 KB)  ( 1176 )
       Main Line: Railway and Rail
12 Design and Experimental Study of Tunnel Anchor for Long-span Suspension Bridge
WEN Qiang, QIAO Leitao, KANG Wei
Research purposes:Taking the tunnel anchor of the 760 m suspension bridge of Youxi Yangtze River Bridge as an example, the stress mechanism and failure mode of the tunnel anchor were studied by theoretical calculation, numerical simulation and in-situ test. The test method and process are introduced, and the test results are analyzed in detail, which provides the basis for design optimization.
Research conclusions:(1) The safety factor of tunnel anchor calculated by the theoretical formula is conservative, mainly because the formula ignores the favorable factors of the interaction between surrounding rock and anchor block, and the geotechnical parameters provided by the general geological survey report are also conservative, which has a certain gap with the in-situ geotechnical test parameters. (2) The numerical simulation is also greatly affected by surrounding rock parameters and has a large error with the test results, but it can be used as a reference for the preliminary design. (3) According to the scale model test, the original design of 40 m long anchor plug of Youxi Yangtze River Bridge has a peak strength of 18P, yield strength of 11P, and proportional ultimate strength of 4P, which has a large surplus and can be appropriately reduced for optimization. (4) The research results can provide reference for the design and test of tunnel anchors of long-span suspension bridges.
2023 Vol. 40 (2): 12-17 [Abstract] ( 2648 ) HTML (1 KB)  PDF  (1111 KB)  ( 1220 )
18 Tunnel 3D Laser Scanning Monitoring Method Based on Probability Density
WEI Zheng, ZENG Qingyi, ZHOU Jianqiang, CHEN Wenwu, ZHOU Zhen
Research purposes:The current monitoring and measurement adopts the total station to monitor the displacement of arch crown settlement, clearance change and other indicators. This kind of monitoring with fixed monitoring point has two major problems: the setting of monitoring targets is not timely, and the monitoring results are not comprehensive. In order to solve this problem, this paper introduces three-dimensional laser scanning technology for monitoring. However, the monitoring results of 3D laser scanning are scattered point clouds, which are difficult to be used directly. In engineering, an accurate, fast and stable method is needed to analyze and evaluate the monitoring results of 3D laser scanning point clouds.
Research conclusions:(1) The greedy triangle method is used to fit the three-dimensional laser scanning point cloud to form a surface, and the normal vector method is used to extract the deformation of the fitting surface formed by the front and rear measured point cloud. After forming the normal vector probability density function, the deformation of the tunnel can be judged by this function. (2) Compared with the high-order continuous maximum entropy method, the probability density function of the normal vector of the fitting surface conforms to the normal distribution, and it can be defaulted that the normal vector conforms to the normal distribution in engineering. (3) The graphic analysis of normal vector can solve the problems of tunnel deformation convergence judgment, local deformation judgment and so on.(4)This research result can be applied to the field of tunnel engineering monitoring and measurement.
2023 Vol. 40 (2): 18-22 [Abstract] ( 2673 ) HTML (1 KB)  PDF  (759 KB)  ( 1271 )
23 Research on the Characteristics of In-situ Stress Field and Rock Burst Risk in Eastern Qinling
CHEN Xingqiang, LIU Jin, MENG Xianglian, ZHANG Wenzhong, HUANG Yong, WANG Huajiang, ZHOU Fujun, LI Yubo, LI Limin, WANG Kai, QIU Shili
Research purposes:Different from the typical rock burst prone area which is a strong compressive tectonic area, the eastern Qinling, which is dominated by the extensional structure in present, also has the characteristics of high in-situ stress and strong rock burst risk. In order to guarantee the construction and route selection of deep ground projects such as railway tunnels, this paper makes a preliminary study on the characteristics of the in-situ stress field, the tectonic causes and the overall control of rock burst.
Research conclusions:(1) The measured extrusion direction of the maximum horizontal principal stress SH in the eastern Qinling is consistent with the direction of the current extensional structure in the area, both of which are NW-SE. This indicates that the in-situ stress is not controlled by current regional tectonics. The average variation gradient of SH is as high as 2.94 MPa/100 m, which is equivalent to that of the Tibet Plateau. Therefore, the area is dominated by the tectonic stress formed by squeezing during Yanshanian, which belongs to the residual stress. This feature indicates that the strain energy of intact rock mass can be retained for hundreds of millions of years, and the strain energy in large rock mass is not easily changed by extensional structure. (2) Regionally, SH in the eastern Qinling is always the maximum value of the three-way principal stress, which is the main control factor of rock burst risk. In the stage of railway route selection, the eastern Qinling needs to focus on the rock burst risk of hard rocks such as granite and diorite. Medium rock burst is easy to occur above 700 m, and strong rock burst is easy to occur above 1 400 m. It is recommended to avoid tunnels buried more than 1 400 m.(3)This research achievement can be popularized and applied to the geological route selection of Qinling and similar mountain railways and the prevention and control of tunnel rock burst risk.
2023 Vol. 40 (2): 23-28 [Abstract] ( 2673 ) HTML (1 KB)  PDF  (1029 KB)  ( 1183 )
       Main Line: Bridge Engineering
29 Research on the Trans-section CWR in the Large Daily Temperature Difference Environment of the Plateau
PAN Zili, WANG Shuguo, XIE Yi, XU Yupo, XU Jian, HE Niangzhe, HAN Yu, WEI Zhengkong, LIU Jianguang, LI Baoyou, CAO Bao
Research purposes:This paper calculated the stability and mechanical properties of the seamless turnout in the large daily temperature difference environment of the plateau with stability formula and the finite element method, analyzed the possibility of the laying of trans-section CWR in the plateau environment with an annual temperature difference of about 70 ℃ and the daily temperature difference of about 40 ℃, and designed trans-section CWR of the station and the tracks at both ends. By using the glue joints to eliminate the turnout and buffer rail joints, the seamless turnout on the bridge was laid for the first time in Tibet, and trans-section CWR between one station and two sections was realized. Through online monitoring and safe operation for more than a year, a large number of reliable data and operation experience of trans-section CWR with large daily temperature difference of the plateau were accumulated.
Research conclusions:(1) It proves that it is feasible to lay trans-section CWR in a plateau environment with an annual temperature difference of about 70 ℃ and a daily temperature difference of about 40 ℃.(2)The glue freezing joint is feasible as the rail connection mode of CWR, which can provide another technical direction for the seamless non-seamless line. (3) In the plateau environment of large daily local temperature change, the key to CWR maintenance is seamless turnout.It is necessary to pay attention to the track geometric position state of the turnout and the displacement of the sharp track and the heart track, and strengthen the maintenance in time when the bad state occurs.
2023 Vol. 40 (2): 29-34 [Abstract] ( 2633 ) HTML (1 KB)  PDF  (963 KB)  ( 1274 )
35 Research on the Fatigue Performance of Longitudinally Connected Floating Slab Track before and after Fatigue
LI Qiuyi, LI Peicheng, WANG Weidong, ZHU Bin, YANG Shangfu, ZENG Zhiping
Research purposes:Compared with urban rail transit, suburban railway trains run faster and have greater axle load. Up to now, there is no precedent for domestic suburban railway to use steel spring floating slab track at a speed of 160 km/h, and no systematic research has been carried out on its adaptability under the operating conditions of suburban railway. In order to design and develop steel spring floating slab track suitable for suburban railway, fatigue tests of full-scale models are carried out, the changes of mechanical properties before and after fatigue are analyzed, and then the changing rules of static stiffness, stress and strain of longitudinally connected steel spring floating slab track are obtained.
Research conclusions:(1) The vertical displacement of the floating slab track decreases after fatigue test, the average displacement decreases by 2.90% after 2 million times of fatigue and 4.78% after 5 million times of fatigue. (2) The static stiffness of the floating slab track increases nonlinearly after fatigue. The static stiffness of floating slab track was 185.02 kN/mm, 189.11 kN/mm and 192.49 kN/mm respectively before fatigue, after 2 million times of fatigue and 5 million times of fatigue. (3) The strain at the strain measuring point on the center line of the floating slab surface increases after fatigue test, and the maximum strain increases 19.21% and 17.70% after 2 million and 5 million fatigue tests, respectively, compared with that before fatigue. (4) The strain at the strain measuring point on the edge of the floating slab surface decreases after the fatigue test, and the maximum strain after 2 million and 5 million fatigue tests decreases by 2.16% and 3.11%, respectively, compared with that before fatigue. (5) After 5 million times of fatigue, the bonding interface between concrete and precast concrete is in a safe state. (6) The research result has a certain reference value for the design and development of the longitudinally connected steel spring floating slab structure suitable for suburban railways.
2023 Vol. 40 (2): 35-40 [Abstract] ( 2627 ) HTML (1 KB)  PDF  (1099 KB)  ( 1183 )
41 Scheme Design and Research of the Main Bridge of Yicheng Hanjiang River Railway Bridge
LI Weidong
Research purposes:Yicheng Hanjiang River Bridge is a key control project of the newly-built Xiangyang-Jingmen High-speed Railway. The main bridge uses double main spans of 2×200 m to cross the navigable waters of the Hanjiang River. After studying the bridge span layout and support system, the two bridge schemes, cable-stayed stiffened rigid frame continuous beam bridge and steel-concrete composite (hybrid) rigid frame continuous beam bridge, are comprehensively compared from the aspects of technology and economy.
Research conclusions:(1) The two schemes are applicable. The cable-stayed stiffening rigid frame continuous beam bridge scheme has advantages in stiffness condition, long-term geometry stability, technical maturity, engineering practice experience, maintenance and landscape effect, etc. (2) The cable-stayed stiffened rigid frame continuous beam bridge scheme, by adopting the layout of "high middle pylon, low side pylon", ensure the reasonable structural stress and avoid the negative reaction of side bearings. (3) The static calculation of the structure shows that the structure is safe and reasonable for loading. The safety of train operation and the comfort of passengers all meet the requirements. (4) The design results can provide reference for similar railway bridges.
2023 Vol. 40 (2): 41-46 [Abstract] ( 2650 ) HTML (1 KB)  PDF  (1686 KB)  ( 1144 )
47 Research on the Characters of Super-large Diameter Rock-socketed Pile Foundation under Vertical Load
SONG Suidi, PENG Xiongzhi, YANG Quan, FENG Zhengxin, GUO Lunbo
Research purposes:There are more and more applications of super-large diameter piles. Further research is needed on the working performance of super-large diameter pile foundations and whether conventional design methods can still be used. In this paper, based on the super-large diameter pile foundation of the Yelanghe Railway Bridge, combined with the specific geological conditions, the FLAC3D software is used to simulate and analyze the vertical load characteristics of the large-diameter single-pile foundation.
Research conclusions:(1) For rock-socketed piles that are completely embedded in strong rock formations or large-diameter pile foundations with high strength of overlying rock formations, when the length-diameter ratio of the piles is greater than 1.8, the lateral resistance curve of the pile foundation is shown as "large on the top and small on the bottom" shape. With the shortening of the pile length and the reduction of the length-diameter ratio, the upper lateral resistance of the pile gradually decreases and the lower lateral resistance gradually increases. When the length-diameter ratio is very small, it becomes a "big at both ends, small in the middle" shape. (2) Only when the elastic modulus of the rock layer on the side of the pile is small or the strength of the overlying soil layer is weak (such as clay) with a super large diameter pile foundation, the lateral resistance curve shows the shape of "small on the top and large on the bottom", and the smaller the elastic modulus of the rock layer on the side of the pile, or the weaker the overlying soil layer, the more obvious this characteristic is. (3) The optimal length-diameter ratio of super-large diameter piles is less than 3, which is smaller than that of small-diameter piles. (4) For the super-large diameter pile foundation of the same diameter, the pile lateral resistance will show three different distribution patterns according to the different elastic modulus of the pile side rock formation. (5) The research results can provide guidance and reference for the research and application of super-large diameter pile foundations.
2023 Vol. 40 (2): 47-52 [Abstract] ( 2626 ) HTML (1 KB)  PDF  (992 KB)  ( 1236 )
       Main Line: Tunnel Engineering
53 Research on the Optimization Calculation Method of Railway Bridge Pile Foundation
LIAO Lijian, YANG Xinan, WANG Yuquan, WANG Xiuyan
Research purposes:In the design of railway engineering general contracting project, the bridge pile foundation has a large volume and many control factors, so there is a large space for optimization. In this paper, the type of pile foundation, pile length, pile body reinforcement and other aspects are studied, on the premise of meeting the requirements of design safety and quality of pile foundation, the optimization calculation method of pile foundation is put forward.
Research conclusions:(1)The concrete calculation method and flow of cast-in-place piles with rotary expanded bulbs were constructed, and the comparison and selection scheme of pile foundation type was added. (2)A linkage iterative algorithm for pile length optimization under seismic load was proposed to accurately calculate the optimal pile length of friction pile foundation of bridge pier. (3)The equivalent geological parameter method was proposed to simulate the pile foundation calculation when the overburden silt layer is thick, and the optimization effect of pile reinforcement is obvious. (4)The calculation method of cubic coordinate transformation was proposed to solve the problem of insufficient calculation accuracy when the bridge pier and foundation produce torsion angle. (5)The above algorithms were incorporated into the pile foundation calculation system and applied in a large number of railway general contracting projects, realizing the fine calculation of railway bridge pile foundation, meeting the design requirements of high economy, high safety and high quality, and saving the engineering cost ranging from 50 million to 180 million for each project. The research results can provide reference for the optimization design of railway bridge pile foundation structure.
2023 Vol. 40 (2): 53-58 [Abstract] ( 2666 ) HTML (1 KB)  PDF  (1282 KB)  ( 1161 )
59 Mechanical Response Caused by Non-uniform Frost Heave Deformation of Surrounding Rock of Shallow Buried Tunnels in Alpine Region
LIN Dexin
Research purposes:The problem of frost damage faced by shallow buried tunnels in alpine regions threatens the long-term safe operation of tunnels. In order to explore the mechanical response of the non-uniform frost heave deformation of surrounding rock under the frost heave mode with unfrozen interlayer, a typical frost heave model of the shallow buried section of the tunnel in cold region was established. The stress deformation and frost heaving force distribution evolution of tunnel lining and surrounding rock were studied by finite element numerical software. Furthermore, the frost resistance design of shallow buried tunnels in alpine regions was optimized according to the research results.
Research conclusions:(1) The outer diameter of the surrounding rock freezing circle and the non-uniform frost heave coefficient k are the key factors affecting the frost heaving force level in the shallow buried section of the tunnel. The larger the outer diameter and k of the surrounding rock freezing circle, the greater the average frost heaving force of the lining. The maximum tensile stress and compressive stress of the lining structure are located at the waist and the vault, respectively. When the thickness of the unfrozen interlayer is small, the local stress of the waist and the vault exceeds the standard strength of concrete. (2) Under the non-uniform frost heave of the surrounding rock, the maximum displacement of the surrounding rock freezing circle, lining and surface layer shows a decreasing trend as the thickness of the unfrozen interlayer increases, and the larger the surrounding rock freezing circle radius is, the higher the maximum displacement is. (3) The unfrozen surrounding rock interlayer has a significant influence on the spatial distribution and evolution of the frost heaving force of the alpine tunnel. With the increase of the thickness of the unfrozen interlayer, the non-uniformity of the tunnel frost heaving force gradually decreases. (4) The frost heaving force distribution and lining mechanical response of shallow buried tunnels in cold regions revealed in this paper can provide theoretical guidance for frost resistance design of similar tunnel projects.
2023 Vol. 40 (2): 59-65 [Abstract] ( 2566 ) HTML (1 KB)  PDF  (1113 KB)  ( 1199 )
66 Gas Outburst and Work Area Determination of the New Baishatuo Tunnel on Chongqing-Huaihua Second Railway
ZHANG Xiongwen, DU Yuben, WANG Ke
Research purposes:The New Baishatuo tunnel of Chongqing-Huaihua second railway passes through the coal measure strata of Wujiaping formation of the Upper Permian system four times. The thickness of coal seam varies from 0.35 to 0.81 m. It is necessary to determine the risk of gas outburst and the type of gas work area for tunnel design and construction. Based on the investigation and collection of coal seam gas data of adjacent existing coal mines and railway tunnels, this paper uses the gas pressure gradient method to calculate and determine the risk of gas outburst, and uses the absolute gas emission formula to calculate and determine the type of gas work area, so as to provide a basis for tunnel structure fortification, risk management and construction organization.
Research conclusions:(1) The New Baishatuo tunnel is buried below the gas weathering zone, and the gas pressure gradient in the site is about 4.5×10-3~5.1×10-3 MPa/m. (2) The initial gas pressure of the excavation working face at the tunnel coal uncovering place exceeds the critical value of 0.74 MPa, which is a dangerous working face with gas outburst. (3) The absolute gas emission of the tunnel through coal measures is about 2.0~2.2 m3/min, which is a high gas work area. (4) The research results can be used as the basis for the design and construction of gas tunnels. The research method can provide reference for determining the type of gas tunnel work area and outburst adjacent to mines and existing railways.
2023 Vol. 40 (2): 66-72 [Abstract] ( 2591 ) HTML (1 KB)  PDF  (1390 KB)  ( 1157 )
       Main Line: Electrification Engineering
73 Research on the Overhead Contact System Crossing Turnout Suitable for Both 1 600 mm and 1 950 mm Wide Pantographs
GUO Qipei, WANG Guoliang, WANG Jiandong
Research purposes:Locomotive pantographs of different widths are used in European railway systems, and the most typical widths are 1 600 mm and 1 950 mm. Part of the existing electrified railway catenary in Europe is only applicable to the pantograph with a width of 1 600 mm. However, in order to better realize the interconnection and interworking needs of the European railway network and meet the smooth operation of trains equipped with a 1 950 mm wide pantograph from other lines, in-depth research has been carried out on the design of complex crossing turnout in the OCS to ensure that the OCS can meet the safe and reliable operation of 1 600 mm and 1 950 mm pantograph at the same time.
Research conclusions:(1) Two typical OCS crossing turnout positioning schemes applicable to both 1 600 mm and 1 950 mm wide pantographs are proposed. The advantages and disadvantages of the two schemes are compared and suggestions for use are provided. (2) The research ideas and layout method of crossing turnout suitable for different width pantographs under the condition of continuous turnout in large and complex stations are provided. (3) The research results have guiding significance for the design of OCS crossing turnout of electrified railway in Europe or other regions where multiple types of pantograph are required to operate simultaneously.
2023 Vol. 40 (2): 73-77 [Abstract] ( 2597 ) HTML (1 KB)  PDF  (986 KB)  ( 1167 )
78 Research on the Fault Location Method of Direct Power Supply Traction Network with Reinforced Line
WEI Jianzhong, GUO Xiaoxu, GAO Shibin
Research purposes:The passenger dedicated line with a speed of 250 km/h can adopt the direct power supply system, and reinforced line can be added in some section. Because the impedance of the contact wire and the reinforced line is not consistent, when the electric traction network fails, the conventional fault location device using the reactance method can not achieve accurate fault location in the power supply section with the reinforced line. This paper first analyzes the problems of conventional fault location using reactance method based on the short-circuit test data of actual operation lines; secondly, for different types of short-circuit faults, the short-circuit impedances of contact wire and reinforced line of up-down electric traction network are derived; then, the spatial distribution of contact wire and reinforced line impedances is comprehensively evaluated, and a new fault location method is proposed; finally, based on DDRTS, the simulation analysis of electric traction network short-circuit fault is carried out.
Research conclusions:(1) Combined with the short-circuit test data of the actual operation lines, the fault location using reactance method used in the traction substation is proved to be defective. (2) The short-circuit impedances of contact wire and reinforced line of up-down electric traction network are derived. The simulation curve of the spatial distribution of the short-circuit impedance of the traction network is consistent with the overall distribution law of the curve derived theoretically. The simulation results are consistent with the theoretical analysis. (3) The method proposed in this paper can provide technical reference for accurate fault location of direct power supply system of electrified railway with reinforced line.
2023 Vol. 40 (2): 78-83 [Abstract] ( 2576 ) HTML (1 KB)  PDF  (735 KB)  ( 1139 )
84 Evaluation Method of Catenary Quality Based on Weighted Rank Sum Ratio Method
HE Changhong
Research purposes:With the increase of the operating mileage of electrified railway, the operation and maintenance pressure of catenary is increasing day by day. In order to ensure the continuous, safe and stable operation of the catenary system, it is urgent to develop an objective and accurate quality evaluation method that can reflect the dynamic and static parameters of the catenary, equipment quality, and mean time between failure.
Research conclusions:(1) In this paper, an evaluation method of catenary quality based on weighted rank sum ratio algorithm is proposed. This method adopts the non-integer rank evaluation method, which can bring the numerical difference between the corresponding evaluation indicators of the evaluation object into the entire evaluation algorithm to obtain more objective evaluation results. At the same time, the method adopts the two-level evaluation index of dynamic and static indicators, equipment quality indicators and mean time between failure and the weighted rank sum ratio method, which has strong operability, easier expert intervention and scientific and reliable results. (2) From the theoretical analysis and experimental data, it can be seen that this method can scientifically and effectively evaluate the quality of rail transit catenary equipment in a certain period of time, and the analysis results have a high reference value for the scientific operation and maintenance of the catenary and the formulation of operation and maintenance strategies. (3) The research results are applicable to the professional field of electrified railway catenary.
2023 Vol. 40 (2): 84-88 [Abstract] ( 2651 ) HTML (1 KB)  PDF  (622 KB)  ( 1183 )
       Urban Railway Development and Technology Research
89 Discussion on the Related Problems of Through Operation of Regional Rapid Rail Transit and Urban Rail Transit
LI Hongqiang
Research purposes:Regional rapid rail transit, as a transportation system serving the center of the city and the surrounding city groups, can be connected with urban rail transit according to the city's development and the change of the passenger flow, and choose the mode of initial through operation and timely split operation. A number of documents issued by the state also put forward the requirements of promoting the mutual integration and interconnection between various rail transportation systems. In this paper, the problems brought by the through operation mode of regional rapid rail transit and urban rail transit in the aspects of operation organization, civil engineering, and electromechanical equipment system are systematically sorted out, and combined with the existing cases, the matters that should be paid attention to in the process of engineering design and construction are summarized for the reference of domestic urban rapid rail transit projects.
Research conclusions:(1) It is very necessary for regional rapid rail transit to connect with urban rail transit, which is also the trend of rail transit development in the future. The interconnection between the two will have an impact on many aspects. The major construction plans should be determined after in-depth comparative analysis. (2) In the process of engineering design and construction, the through operation scheme should be mainly considered in the aspects of operation organization scheme, engineering transformation, electromechanical equipment system, etc. (3) The necessity and feasibility of through operation should be fully studied in the design stage of domestic regional rapid rail transit project. (4) The research results can be applied to the research of regional rapid rail transit and urban rail transit.
2023 Vol. 40 (2): 89-93 [Abstract] ( 2603 ) HTML (1 KB)  PDF  (743 KB)  ( 1308 )
94 Research on the Suburban Train Operation of Huairou-Miyun Railway in Beijing Hub
LIU Jianguang
Research purposes:Suburban railways are increasingly becoming the development direction of narrowing the time and space distance between central urban areas and satellite cities, solving congestion, and optimizing urban structure. In the development of urban (suburban) railways in metropolitan areas, priority can be given to using existing railway resources to operate urban (suburban) trains. Beijing's Huairou and Miyun districts have no direct rail transit connection with the central urban area, and the existing transportation system cannot adapt to the needs of passenger flow. It is of great significance to study the use of existing railways to operate suburban trains to provide safe, fast and comfortable public transportation services, establish rapid commuter transportation links between Science City, Xincheng and Zhongguancun, and build high-quality tourism and sightseeing lines, which is of great significance to enhance the coordinated development of the two Science Cities, enhance passenger flow efficiency, promote economic development along the line, and improve quality.
Research conclusions:(1) From the perspective of comprehensive technical economy, transportation organization, and project implementability, it is recommended to use the Beijing-Zhangjiakou high-speed railway and the Beijing-Tongliao line to open suburban trains into Beijing North Railway Station. (2) According to the passenger flow forecast and the existing line operating conditions, a reasonable suburban train operation plan is obtained. (3) Combined with the projects under construction, the adaptive transformation of Beijing North Railway Station, the maintenance of Beijing North Railway Station and bullet trains, and the control level conversion in Changping Station-Qijianfang line and other supporting transformations are carried out. (4) The research results have reference significance for existing railways to study and operate suburban trains.
2023 Vol. 40 (2): 94-99 [Abstract] ( 2598 ) HTML (1 KB)  PDF  (2596 KB)  ( 1316 )
100 Research on the Fine Design of Suburban Railway Station Scale
LI Yongsheng
Research purposes:Based on the engineering practice of Shanghai Rail Transit City Line Airport Tie Line Project, and on the basis of existing experience and technical standards, in-depth analysis and research are carried out from the three directions of station burial depth, station length, and platform floor height, which mainly affect the size of the station, to summarize scientific and reasonable train of thought for station design, guide the fine design of large-scale suburban railway underground stations, reduce the construction scale of the station, and reduce project investment, and improve the safety, rationality, forward-looking, economic and other construction goals of suburban railways.
Research conclusions:(1) Give priority to rigid catenary, adjust the position of air duct at rail top or cancel the air duct at rail top after adopting relevant measures, which can reduce the floor height of the station. (2) Train formation and type directly affect the length of the station; CBTC system can reduce the length from the turnout to the end of the platform, and then reduce the length of the station. (3) The design of the way that the screen door moves 1.2 m towards the inner side of the platform can meet the current interconnection and multi-vehicle alignment. It is still necessary to strengthen the research and development of intelligent envelope platform screen door system. (4) Through detailed investigation and analysis on the technical aspects of building gauge, air duct at rail top, vehicle selection, CTCS2 system, CBTC system, OCS selection, distance from platform to wiring, key technologies of smart platform screen door system and so on, the reasonable station design scheme and improvement ideas are explored, the project scale of the station is reduced and the fine design of the station is realized, to provide reference for the future study of suburban railway construction standards.
2023 Vol. 40 (2): 100-105 [Abstract] ( 2598 ) HTML (1 KB)  PDF  (1259 KB)  ( 1318 )
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