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2024 Vol. 41, No. 8 Published: 2024-08-15

Urban Rail Construction Main Line: Survey and Design Main Line: Engineering Geology and Subgrade Main Line: Communication Signals Main Line: Bridge Engineering Main Line: Tunnel Engineering Main Line: Electrification Engineering Terminal, Station yard and Building Main Line: Railway and Track

Main Line: Survey and Design

	1	Exploration of Intelligent Pathways for Survey and Design of Land Transportation Infrastructure
		ZHENG Hong, XIE Hao, YAO Hongxi, SONG Wenxiang, ZHONG Jing
		Research purposes: The intelligence of the whole process of survey and design of land transportation infrastructure is the only way to improve the efficiency and quality of survey and design, and lead the industry reform. In order to accelerate the process of intelligent survey and design, meet the needs of integration, this paper starts from the business process of survey and design, covering generic technology fields of railway and highway, including surveying and mapping, survey, route selection, subgrade, bridge, and tunnel. From the three aspects of technology research, standard construction and platform research and development, the intelligent path of survey and design of land transportation infrastructure is discussed. Research conclusions: (1)The intelligent survey and design of land transportation infrastructure adopts a general technical framework with the process as the main thread, data as the core, intelligent technology as the driver, and software platforms as the carrier. It focuses on overcoming four sets of key intelligent technologies: "intelligent surveying, intelligent reconnaissance, intelligent route selection, and intelligent design". It establishes digital and intelligent standards, develops intelligent survey and design platforms and delivery platforms, and forms a technical system for intelligent survey and design of land transportation infrastructure. (2) Four sets of intelligent key technologies can achieve breakthroughs in the rapid acquisition of infrastructure spatial geography and geological information based on BDS ground-based/satellite-based enhanced services, multi-source data fusion and three-dimensional digital expression, multi-target intelligent optimization of route selection, intelligent decision-making of key structure design scheme, digital modeling and integrated design. (3) The construction of digital and intelligent standard system is to carry out standardized research from the dimensions of survey and design data architecture, data storage, data transmission, intelligent design requirements and algorithms, and deliverables. (4) The research and development of intelligent survey and design platform and delivery platform is based on unified data and platform architecture, adopts independent graphics engine, and realizes intelligent survey and design and delivery of land transportation, supporting high-quality development in the field of survey and design of land transportation infrastructure.
		2024 Vol. 41 (8): 1-6 [Abstract] ( 6 ) HTML (1 KB) PDF (996 KB) ( 1 )

	7	Karst Geology and Railway Survey Practice in Wuling Mountain Area
		WANG Yinghe, SUN Honglin, WANG Xiang
		Research purposes: The terrain and geological conditions of the Wuling Mountains, which extended across western Hunan, western Hubei, eastern Chongqing, and eastern Guizhou, were complex and had a special geographical, geological, and climatic background. With the advancement of the national strategy of western development, the construction of railways in this region had made significant progress and was continuously advancing. This paper summarized the experience of railway engineering in the Wuling Mountain area, and discussed the future development direction. Research conclusions: (1) The majority of the Wuling Mountain area was located in carbonate plateaus, with a soluble rock area accounting for over 60% of the regional area. Karst was strongly developed, and karst and karst water had become the main geological issues controlling railway line schemes. (2) The morphology, scale, and intensity of karst development in this region were mainly controlled by structures, and overall were characterized by large scale, deep depth, and poor regularity. (3) The local area should followed the concept of "disaster reduction and prevention" for geological route selection. During the survey, a special karst survey should be carried out to investigate the distribution of karst along the route, and "avoidance" should be the first principle for route selection; when it was impossible to avoid, the line positioning plan should be determined according to the principle of "raise the elevation". (4) Utilizing modern information technology, developing new technological equipment, and moving towards more precise identification, reliable analysis, and precise treatment had become an inevitable requirement and trend for controlling karst geological risks and solving engineering problems in the local area. (5) The research results can provide reference for future railway survey, design, and construction in the Wuling Mountain area.
		2024 Vol. 41 (8): 7-11 [Abstract] ( 2 ) HTML (1 KB) PDF (1370 KB) ( 0 )

	12	Research on the Reconstruction Plan of Existing Railways in Complex Urban Areas
		QIN Guoqiang
		Research purposes: The construction of existing railways is relatively early, mostly built as roadbed, occupying the core position of the main urban area of the city. With the development of cities, the problem of existing railways obstructing urban traffic and causing fragmentation of urban areas is becoming increasingly prominent. In order to adapt to urban planning and development, optimize the urban transportation network, and reduce the cost of municipal road construction, this paper takes the renovation project of the Xiaoshan urban section of the Shanghai-Kunming Railway as an example to study the renovation plan of existing railways in complex urban areas. Research conclusions: （1）The existing railway renovation plan in urban areas should be coordinated and consistent with the overall urban planning and future development.（2）Detailed analysis of the impact of existing railways on the development of urban areas and urban transportation network were presented with the necessity of reconstruction project construction proposed.（3）Based on the characteristics of the project, the existing railway situation, and the influence of control factors such as the overall layout of the hub, a comprehensive study is conducted to determine the scope and type of renovation plan for the project. Multiple schemes are compared to determine the implementation plan and construction transition plan for the project renovation.（4）This study can provide reference for the study of existing railway renovation projects in similar urban areas.
		2024 Vol. 41 (8): 12-16 [Abstract] ( 3 ) HTML (1 KB) PDF (593 KB) ( 0 )

	17	Study on Coal Railway Transportation Path and Capacity Expansion Scheme from Xinjiang to Ningxia
		WANG Boying
		Research purposes: In recent years, the demand for coal transport from Xinjiang to Ningxia is increasingly strong, but the existing railway transport channels have the problems of insufficient transport capacity and low transport quality. In this context, starting from the existing railway network pattern, this paper points out that the available railway transport channels, proposes capacity expansion measures for various transport routes by sorting out existing problems and combining relevant railway network planning. On the basis of quantitative analysis, the implementation effect of the two transportation channels is compared by comprehensive application of Delphi method and value engineering principle. The advantages and disadvantages of each transportation channel and its value coefficient are analyzed, and the selection of coal transportation channel from Xinjiang to Ningxia is recommended. Research conclusions: (1) Under the overall pattern of the existing railway network, there are two transportation channels for coal transportation from Xinjiang to Ningxia. (2) With the improvement of the regional network and the necessary expansion and transformation measures, the north and south transportation channels can meet the transportation requirements. (3) Although the transportation scheme of the south channel is superior in terms of transport quality and project investment, the transportation scheme of the north channel has obvious capacity expansion effect, high channel capacity guarantee degree and higher value coefficient. The north channel is finally determined as the recommended scheme. (4) The research results can provide reference for the selection of coal railway transportation path from Xinjiang to Ningxia and related railway expansion measures.
		2024 Vol. 41 (8): 17-22 [Abstract] ( 5 ) HTML (1 KB) PDF (507 KB) ( 0 )

Main Line: Engineering Geology and Subgrade

	23	Characteristics and Countermeasures of Slow Small Deformation Geological Diseases of Mountain Railway
		CHEN Minghao, ZHANG Guangze, CUI Jianhong, ZHOU Hang, ZHANG Yingxu
		Research purposes: In recent years, many mountain railways in China have experienced small deformation geological diseases such as subgrade arching, tunnel floor heave and bridge offset. The deformation is generally tens of millimeters or even hundreds of millimeters, which seriously affects the smoothness of the rail surface and leads to different degrees of speed limit operation. Through the analysis of three typical cases, the engineering characteristics and deformation causes of various small deformation geological diseases were studied, and the prevention and control countermeasures with the engineering practice were presented. Research conclusions: (1) The geological diseases of small deformation of arch on subgrade mostly occur in deep and wide cutting sections, which are mainly caused by the continuous deformation of gently inclined soft rock strata caused by the coupling effect of unloading rebound and expansion creep. The prevention and control measures of "stress isolation, strain energy dissipation and structure detachment" can be adopted. (2) The small deformation geological disease of bridge offset is easy to occur in the slope zone composed of broken rock and soil mass with steep terrain cutting. It is in the creep stage of landslide brewing period. The creep body should be used as the landslide body, and the measures of intercepting drainage and retaining should be taken to improve its stability. (3) The small deformation geological diseases of tunnel floor heave mostly occur in the complex section of geological structure environment, and the flexural fold type floor heave creep deformation of unloading relaxation-bending slab coupling occurs. The prevention and control measures of "dewatering pressure, adjusting curvature, increasing thickness and increasing strength" can be comprehensively adopted. (4) The research results of this paper have guiding significance and application value for the follow-up comprehensive investigation and treatment of slow-moving and small-deformation geological diseases of mountain railways.
		2024 Vol. 41 (8): 23-29 [Abstract] ( 4 ) HTML (1 KB) PDF (3732 KB) ( 0 )

	30	Study on Physical Parameters and Mechanical Characteristics of Tertiary Mud Stone in Baoji-Lanzhou High-speed Railway
		JIN Baocheng, WANG Xindong, HE Siyue, FU Yapeng, HE Yongwang, SHI Xianwei
		Research purposes: Tunnel construction in expansive strata is a difficult engineering problem. Based on the expansion and groundwater test of the Beiershilipu tunnel in Baoji-Lanzhou High-speed Railway, an in-depth study of soil expansion characteristics of mud stone is conducive to determining the influence of mud stone expansion on the track deformation of tunnel and improving tunnel design theory. Research conclusions: (1) Tertiary mud stone has weak expansibility. (2) The elastic modulus, uniaxial compressive strength, uniaxial tensile strength and triaxial compressive strength of expansive rock decrease significantly after soaking, and the decreasing rates of each strength gradually decrease with the increase of soaking time. (3) The uniaxial compression tests show that the average uniaxial compressive strength decreases from 29.18 MPa to 4.65 MPa, decreasing by 84%, and the average elastic modulus decreases from 2.32 GPa to 0.85 GPa, decreasing by 63%. The Brazilian splitting tests show that the average tensile strength of the expansive rock decreases from 2.66 MPa to 0.36 MPa, decreasing by 86.5%. The triaxial compression tests show that the cohesive force of the expansive rock decreases significantly with the increase of immersion time, especially in the initial stage of immersion, from 5.82 MPa to 1.34 MPa, which decreases by 77%. However, the internal friction angle of the expansive rock decreases, but the decrease is not large, and the total decrease is 4.07% within 15 days of immersion. (4) The research results can provide reference for the design of railway tunnels similar to expansive mud stone.
		2024 Vol. 41 (8): 30-38 [Abstract] ( 3 ) HTML (1 KB) PDF (1509 KB) ( 0 )

	39	Research on the Countermeasures for High Speed Railway Subgrade Small Angle Crossing Shallow Buried Tunnel of Existing Railway
		ZHAO Dou
		Research purposes: High speed railways cross shallow buried sections of existing railway tunnels at small angles in the form of subgrade. In order to avoid adverse effects on existing railway tunnels caused by new railway subgrade loads, mechanical vibrations during construction, and later operation, relevant research is conducted to evaluate the degree of impact, optimize the subgrade structure, propose operation monitoring plans, and provide guidance for design and construction, which is of great significance for ensuring the safety of high-speed railway and existing railway operations. Research conclusions: (1) The research proposes the impact assessment method, control indicators, and evaluation parameters for high-speed railway crossing existing railway tunnels. (2) Conducting an impact assessment of conventional subgrade design schemes, it was found that the existing railway tunnel structure is approaching the limit level of stress and has insufficient safety reserves. (3) The research proposes the design scheme and static compaction measures for pouring lightweight concrete into U-shaped grooves for lightweight structures. Compared with conventional subgrade design schemes, the optimization amplitude of the stress impact on the lining of existing railway tunnels can reach 30% to 50%. (4) A total station automation monitoring scheme is proposed, including monitoring scope, monitoring content, monitoring layout requirements, monitoring frequency, monitoring warning threshold, etc. (5) The research results can provide reference for other newly-built railway projects crossing existing railways.
		2024 Vol. 41 (8): 39-44 [Abstract] ( 4 ) HTML (1 KB) PDF (681 KB) ( 0 )

	45	Research on the Analysis and Design Method of Bidirectional Loading Pile for Pile Supported Subgrade
		GUO Shuaijie, SONG Xuguo, ZHOU Yadong, ZHANG Haiyang, YAN Muhan
		Research purposes: In order to study the bidirectional loading pile working mechanism and design methods for pile supported subgrade, and determine the key factors affecting bidirectional loading pile bearing capacity with the horizontal load as well as the axial force, elasticity theory, horizontal soil arch theory, elastic foundation beam theory and finite difference method were applied in the research. An internal force deformation model was established and applied in the influences research of the horizontal foundation coefficient, the pile axial force, the boundary constraints as well as the pile length. Moreover, a design process for pile supported subgrade bidirectional loading pile was also proposed out accordingly. Research conclusions: (1) Pile supported subgrade piles were under bending and compression condition which exhibited the passive pile bearing characteristics, and internal forces and deformations accurate calculation could be obtained through the horizontal soil arch and finite difference method. (2) Bidirectional loading pile internal force and deformation through "m" method was safer, while the segmented "K" method for layered foundation would better reflect the influences of weak interlayers. (3) Pile axial force influences on the bidirectional loading pile bearing capacity was minimal, and the influences of pile axial force value and distribution could be ignored in the design. (4) Influences of pile top constraint on bidirectional loading pile bearing capacity were more significant than that of pile end constraint, and a free constraint boundary could be applied in the pile end boundary, and the pile top embedding boundary would cause a more significant concentration of pile internal force. (5) Pile length impact on bidirectional loading pile bearing capacity existed a limit, and it would be more reasonable as the pile length generally exceed the area where the pile horizontal load was relatively maximum. Moreover, the short column pile bearing situations should be avoided. (6) The research conclusion could provide theoretical support and methodological basis for bidirectional loading pile design in pile supported subgrade.
		2024 Vol. 41 (8): 45-51 [Abstract] ( 4 ) HTML (1 KB) PDF (1121 KB) ( 0 )

Main Line: Railway and Track

	52	Study on Initial Construction Length of EMS High-speed Maglev Engineering Test Line
		MU Hanlin, XU Xubao, MA Weihua, WU Jie, YU Zhuangzhuang
		Research purposes: China's EMS high-speed maglev has the conditions to promote engineering testing and demonstration operation line construction, and it is urgent to build an engineering test line to verify key technologies of high-speed maglev. This paper starts with the initial test requirements of EMS high-speed maglev engineering test line. The initial construction of the engineering test line does not consider ride comfort, and tries to use larger acceleration and deceleration speeds to reduce the length of the initial test line construction while meeting the requirements of initial speed testing, saving initial test line engineering investment. Research conclusions: (1) The high-speed maglev engineering test line is mainly a test to confirm various performance and practical goals at a speed of 600 kilometers per hour. (2)The initial construction length of the engineering test line must meet the requirements of the minimum distance for train acceleration and deceleration, as well as a certain uniform speed running distance. When the parameters of the domestically produced 600 km/h high-speed maglev train are fixed, the average acceleration and deceleration mainly depend on the rated voltage and maximum current of the traction converter. Through matching simulation calculation of the power supply system, the lighter the vehicle, the shorter the stator segment length, the greater the vehicle acceleration that can be provided, and the shorter the initial engineering test line construction length. (3) The research conclusion can provide reference for the construction of the engineering test line of the EMS high-speed maglev railway.
		2024 Vol. 41 (8): 52-56 [Abstract] ( 3 ) HTML (1 KB) PDF (711 KB) ( 0 )

	57	Study on Longitudinal Slope of Rail Expansion Joints Laying for Hangzhou Bay Cross Sea Railway Bridge
		ZHANG Jian, LI Dacheng, ZHANG Zhichao
		Research purposes: The use of large-span cable-stayed bridges and long continuous beams in high-speed railways is becoming increasingly common, and the steel rail expansion and contraction adjuster plays an important role in ensuring train safety. The steel rail expansion adjuster is sensitive to the longitudinal slope of the railway line. In order to ensure the safety of the line, improve the stability of high-speed trains, and reduce engineering investment, this paper studies the slope setting of the steel rail expansion adjuster for the Hangzhou Bay Cross Sea Bridge of the Nantong Ningbo high-speed railway, providing support for project technical decision-making. Research conclusions: (1) Static and dynamic analysis shows that the longitudinal slope of the track has a relatively small impact on the longitudinal displacement of the pointed rail of the rail expansion adjuster. Under the condition of a 12 ‰ slope, all dynamic indicators of the track and bridge meet the regulatory limits, and setting up a rail expansion adjuster is feasible. (2) Setting up a real-time online monitoring system to provide a basis for scientific maintenance of rail expansion and contraction regulators is suggested. (3) The research results have positive significance for optimizing the setting scheme of expansion regulators for railway large-span bridges and reducing engineering investment.
		2024 Vol. 41 (8): 57-60 [Abstract] ( 4 ) HTML (1 KB) PDF (602 KB) ( 0 )

	61	Research on the Health Monitoring of Welded Turnout in Plateau Area
		LIU Dan, SU Chengguang, ZHANG Min, FANG Jia, LIU Chao, LI Zhijun
		Research purposes: Welded turnouts are one of the key technologies for continuously welded rail, and the intricate climate in plateau areas complicates their stress state. In order to ensure the safe operation of trains, it is necessary to conduct long-term real-time health monitoring on them. This paper constructs a real-time health monitoring system for welded turnouts in plateau areas and conducts online monitoring on a group of turnouts for two months. The corresponding analysis is carried out on rail temperature, displacement of switch point, and fracture of switch blade during the monitoring period. Research conclusions: (1) The trend of rail temperature changes is consistent with that of air temperature changes. The highest rail temperature always exceeds the daily maximum air temperature, with an average difference of 11.75 ℃. Generally speaking, the occurrence time of rail temperature is about 3 hours earlier than that of air temperature. (2) The minimum rail temperature is typically concurrent with the air temperature, usually occurring between 7:00 to 8:00 in the morning.（3）There is a strong linear relationship between rail temperature and air temperature, with the rail temperature changing by approximately 1.5 ℃ for every 1 ℃ change in air temperature. (4) The trend of longitudinal displacement at the switch point is consistent with the temperature changes in both air and rail, showing a linear relationship with air temperature. (5) This research can provide data support for the maintenance and repair of welded turnout in plateau areas.
		2024 Vol. 41 (8): 61-66 [Abstract] ( 4 ) HTML (1 KB) PDF (1567 KB) ( 0 )

Main Line: Bridge Engineering

	67	Design of Asymmetric Continuous Steel Truss Girder with Flexible Arch in Mountainous Area
		FANG Shuaiping
		Research purposes: Steel truss flexible arch bridges are generally symmetrical structures, but for railway bridges in mountainous areas, many factors such as site topography, geological conditions, construction conditions and seismic performance should be considered. Based on the research background of a bridge spanning a deep V-shaped ditch in mountain railway, this paper proposes an asymmetric steel truss flexible arch bridge scheme for the steep terrain, narrow construction space and difficult construction, to broaden the idea for the selection of railway bridges in mountainous areas. Research conclusions: (1)The scheme of (216+144) m asymmetric continuous steel truss flexible arch bridge is adopted, which is suitable for the construction conditions of the bridge site. (2)Through the finite element model, the static and dynamic calculation analysis of the bridge shows that the mechanical properties of the bridge, such as structural stiffness and member strength, can meet the requirements of the relevant codes. (3)The bridge deck system adopts the longitudinal and horizontal beam, and the ballast trough plate is set on the longitudinal beam, which not only reduces the dead weight of the bridge deck, but also solves the problem of maintenance and replacement in the later period of the bridge deck. (4)The bridge adopts the construction scheme of tower and cable, which solves the problem of excessive stress and deformation of the main truss in the process of suspension.(5)The bridge has the advantages of novel form, reasonable structure, beautiful shape and efficient material. It has reference significance for the design of bridge in mountainous terrain.
		2024 Vol. 41 (8): 67-73 [Abstract] ( 4 ) HTML (1 KB) PDF (2576 KB) ( 0 )

Main Line: Tunnel Engineering

	74	Analysis of Rock Burst Characteristics in High Stress Zone of Xianshui River Structural Belt Tunnel
		FENG Tao, JIANG Liangwen, YUAN Dong, LIN Zhiheng, MENG Shaowei, CHEN Yu
		Research purposes: The continuous uplift of the Qinghai-Tibet Plateau has led to prominent high ground stress characteristics in the Xianshuihe structural belt and adjacent areas, with extremely complex ground stress fields. Studying the disaster prone characteristics of high ground stress is helpful for the risk prevention and control of tunnel rockburst, especially in the study of the disaster prone and causative mechanisms of time-delay rockburst. This paper elaborated on the overall understanding of disaster prevention in the Xianshuihe tectonic zone, including its landforms, stratigraphic lithology, structure, and stress field characteristics. Through statistical analysis of approximately 1 300 times rock bursts in tunnels within a distance of nearly 10 km in the region, the characteristics of rock bursts were studied from multiple perspectives such as probability, level, burial depth, location, time, and distance. The five time delayed rock bursts and the characteristics of tunnel time-dependent changes were analyzed, and the future focus of rock burst research was discussed. Research conclusions: (1) The Xianshui River structural belt and its adjacent areas are affected by high ground stress, with hidden and irregular small and micro structures, creating a special disaster prone environment for rock bursts. The randomness of rock bursts is high. (2) The rock burst level of the tunnel in this area is mainly mild, with characteristics of "zone rupture" and brittle deformation. Time delayed rock bursts have a certain degree of "inheritance". (3) It is recommended to strengthen the monitoring and research of low burial type rock bursts, lagging type rock bursts, or potential time-dependent failure of hard rocks in valley stress fields. (4) The research results of this paper can provide reference for rock burst prediction and prevention in similar high stress environments.
		2024 Vol. 41 (8): 74-78 [Abstract] ( 2 ) HTML (1 KB) PDF (1244 KB) ( 0 )

	79	Study on Correlation between BQ Method, Q Value Method and RMR Method of Railway Tunnel
		WANG Youxuan, SHEN Weisheng, HUA Lijing, ZHENG Shilong
		Research purposes: Surrounding rock classification is a key parameter to be determined in the design and construction of railway tunnels. With the in-depth implementation of China's railway "going out" strategy, it is often difficult for Chinese design engineers and international consultants to reach a consensus on the selection and application of tunnel surrounding rock classification methods, thus affecting the smooth development of overseas projects. In order to study the correlation between Chinese standard BQ method and the international mainstream Q value method and RMR method, the three surrounding rock classification methods, BQ method, Q value method and RMR method, were summarized and compared, and a number of representative railway tunnels at home and abroad were selected to use the above three methods to classify the surrounding rock on the tunnel face of the same chainage, and the classification results were compared and analyzed in combination with other literature research results. Research conclusions: (1) Q value method and RMR method both have advantages and disadvantages in practical engineering applications, and the determination of site surrounding rock grade should be combined with the Chinese standard BQ method to reach a conclusion. (2) The relationship between [BQ] value and Q value conforms to exponential function, the relationship between [BQ] value and RMR value conforms to linear relationship, and the relationship between Q value and RMR value conforms to logarithmic function. (3) In terms of the difference of research results on the relationship between BQ method, Q value method and RMR method in different literatures, the relationship between Q value and RMR value is the smallest and most widely used, followed by the relationship between [BQ] value and RMR value, and the relationship between [BQ] value and Q value is the largest. (4) This paper establishes a corresponding relation table between the Chinese standard BQ method, the international Q value method and the RMR method for the classification of surrounding rock grades. In the case that the BQ method cannot be applied to the classification of surrounding rock grades, the table can help Chinese design engineers to understand and select the surrounding rock supporting system. The research results will be conducive to the mutual learning and integration between BQ method, international Q value method and RMR method. It has certain guiding significance for overseas tunnel engineering design and construction.
		2024 Vol. 41 (8): 79-85 [Abstract] ( 2 ) HTML (1 KB) PDF (571 KB) ( 0 )

Main Line: Communication Signals

	86	Research on Interface Design of Signal Engineering in Running Suburban Trains by Using Existing Railway
		ZHANG Yu, HE Yongfa, DENG Weilong, NAN Di, YUAN Min
		Research purposes: Aiming at the station layout such as the swallow tail tunnel, the short effective length of station track and the multi-line parallel lines in the project of using the existing Northeast Ring Railway in Beijing Railway Hub to build the second line to run suburban trains, the several schemes about interface design are analyzed and researched for the signal cable channel reservation, integrated grounding setting scheme, trackside signal equipment cable into the cable channel, remote LEU settings in the swallow tail tunnel, signal equipment settings of station track, and the cable channel settings of existing multi-line parallel lines, and the design scheme suitable for the implementation of the project is proposed. Research conclusions: (1)The interface design scheme of signal engineering for swallow tail tunnel proposed in this paper can reduce the cross of strong and weak electricity, improve the grounding effect, reduce the influence of trackside signal equipment cable into the cable channel on other professions, realize the different physical path connection of remote LEU. (2)The signal equipment settings of station track proposed in this paper can reduce the length of the station track while avoiding adjacent line interference. (3)The cable channel settings of multi-line parallel lines proposed in this paper can meet the operational requirements of separate ownership and the maintenance of different lines. (4)The research results proposed in this paper have engineering feasibility, which can be selected and referred for similar projects.
		2024 Vol. 41 (8): 86-90 [Abstract] ( 4 ) HTML (1 KB) PDF (926 KB) ( 0 )

Main Line: Electrification Engineering

	91	Analysis of Seismic Effects and Anti-seismic Performance of Electrified Railway Catenary System
		YANG Jia, CHEN Fenfei, JIA Chuanguo, LV Junyi, XING Ting, ZHANG Jiawei
		Research purposes: Electrified railways in areas with high seismic intensity pass through many seismic fault zones, the catenary system is prone to damage under the action of earthquakes, which can easily affect the normal operation of trains. This paper combined electrified railways in high seismic intensity areas and conducted full-scale shaking table tests on 4-column and 3-span prototypes based on the service characteristics of the overhead contact system. The finite element model of the overhead contact system under earthquake response was established and verified. The seismic response simulation calculation of the overhead contact system under earthquake action was carried out, and the seismic performance of key equipment such as overhead contact wire, cantilever, locator, and pillar was compared and analyzed. At the same time, the seismic performance of key equipment such as the catenary wires, cantilever, positioners, and poles were comparatively analyzed, and the impact of different working tensions, spans, and anchor lengths of the catenary wires on the seismic performance of the catenary system were compared and analyzed. Besides, the seismic design principles and measures of the catenary system in high seismic intensity areas were proposed, and the response rules and seismic performance of the catenary system under earthquake action were comprehensively analyzed and studied. The analysis data and research conclusions on the seismic performance of catenary systems proposed in this paper can effectively supplement and improve the seismic design specifications and standards of catenary systems, strongly support the construction of railway projects, and improve the disaster prevention and resilience capabilities of electrified railways. Research conclusions: (1) Seismic excitation has little impact on the catenary cantilever, and the positioner is stressed, causing the hook ring structure to easily fall off. (2) Seismic excitation has a very obvious impact on the catenary poles and contact wires, which can cause the poles to collapse, the bottom stress of poles increases and the mid-span displacement of the contact wire increases. (3) The length of the anchor section has no significant impact on the seismic performance. Appropriately increasing the working tension of the contact line and reducing the span can effectively reduce the seismic response of the catenary system. (4) The results of the research can provide guidance for the design of disaster prevention and reduction in the rail transit field.
		2024 Vol. 41 (8): 91-96 [Abstract] ( 5 ) HTML (1 KB) PDF (676 KB) ( 0 )

Terminal, Station yard and Building

	97	Research on the Station Plane Layout of Xili Station in Shenzhen Terminal
		ZHANG Minglei
		Research purposes: Xili Station connects four high-standard railways, characterized by a large passenger flow, a large station scale, and a complex traffic structure. The layout of its station yard plays a crucial role in ensuring efficient and smooth train arrivals and departures, and coordinating the capacity of tracks and lines. Through the study of Xili Station's station layout scheme, this paper aims to explore the design methods and technical routes for the flat layout of large passenger stations, providing references for similar projects. Research conclusions: (1) In researching the layout of large passenger stations, firstly, the nature and size of the station should be analyzed and determined based on the operational volume of the station and the train operation plan. Next, considering the characteristics of the introduction lines and the operational features of the station, the most rational station layout scheme is chosen through a comprehensive and multifaceted comparison. Then, the throat layout is optimized to ensure sufficient parallel approaches are equipped, and a reasonable division of work for arrival and departure tracks is established to enhance the operational efficiency of the station. Finally, the reasonableness of the selected plan is verified through an analysis of the station's capacity adaptability. (2) As the main passenger station in the Shenzhen terminal, Xili Station primarily handles the origination, termination, and overtaking operations of multiple unit train for each introduction line. Adopting a track-segregated yard layout is appropriate, and the station's design capacity is sufficient to meet transportation demands. (3) The technical route and research results can provide reference for the study of station types and station layout of large passenger stations in similar projects.
		2024 Vol. 41 (8): 97-102 [Abstract] ( 4 ) HTML (1 KB) PDF (757 KB) ( 0 )

	103	Design and Operational Adaptability Analysis of Nanchang West Passenger Station
		HOU Xiangju, WANG Hua, HUANG Jian, HE Anjing
		Research purposes: To meet the transportation service functions, optimize transportation routes, ensure station functions aligning with transportation convenience, the short-term and long-term planning of railway hubs, and save project investment, are key considerations in the design of large passenger stations in railway hubs. This paper proposed design principles and concepts for large stations, studied the design concept and station layout characteristics of the newly built large passenger station in the Nanchang Railway Hub—Nanchang West Passenger Station, analyzed the operational adaptability, and examined the conformity between the planned design and actual operation. Research conclusions: (1) Principles and concepts for the design of newly built large passenger stations were proposed, indicating that combining the characteristics of the design scheme with operational process arrangements could enhance the operational capacity of the station. (2) The special design of combining the overpasses in the throat area at one side of the station with the in-station transfer lines could achieve the transportation service functions of a large passenger station in the hub. (3) Strengthening communication and interaction with frontline operational personnel could enhance detailed design and improve the operational capacity of sections and facilities. (4) The research results can serve as references for the planning, design, and operation of large stations and sections.
		2024 Vol. 41 (8): 103-110 [Abstract] ( 3 ) HTML (1 KB) PDF (1759 KB) ( 0 )

Urban Rail Construction

	111	Study on the Smoke Characteristics of Early Fire on a Running Train in the Tunnel
		JIANG Chongxu, NA Yanling
		Research purposes： Figuring out the characteristics of early smoke flow from a running train fire is the foundation of fire detection, location and warning. Based on the numerical simulation model of train fire, six different-location-fire models of roof, bottom, front, middle and rear of 120 km/h running train are used to study the variation of air temperature and smoke concentration at different times. Research conclusions: （1）The smoke is asymmetrically distributed, and tends to spread to the rear, it can not detect the changes in temperature and smoke concentration from 1 m distance ahead of the fire.（2）The real-time monitoring values of temperature and smoke concentration are negatively correlated with the distance from fire source,and the air temperature of an under -train-fire is 100% higher than that of a fire on the roof, and the smoke concentration is 500% higher.（3）The relative velocity has little influence on the absolute temperature ratio. The absolute temperature ratio is greater than 0.45 (1 m away from the fire) and 0.75(3 m away from the fire) whether the relative velocity is 5 m/s or 10 m/s.（4）The research results could provide references for fire protection technical standards and the design of smoke management systems.
		2024 Vol. 41 (8): 111-115 [Abstract] ( 3 ) HTML (1 KB) PDF (3002 KB) ( 0 )