This study focuses on a rectangular prefabricated station structure scheme developed and applied for the first time to the Shenzhen Phase V Project. Combined with the evolution process of the prefabricated structure scheme with dry connections, this paper introduces in detail the section design scheme of the rectangular structure scheme, structural partitioning and joint, bracing system of the beamcolumn, and static and dynamic performances. The rectangular prefabricated station structure scheme can be applied to different station width requirements, and an adjustable template is used to effectively improve the universality of the rectangularstructure components. Simultaneously, the rectangular structure can be expanded to accommodate different types of stations, such as threelayer twospan or twolayer threespan. Additionally, the bending bearing capacity of a rectangular assembled station joint was verified by a fullscale joint test, and the adaptability of the theoretical calculation method of the existing joint research to structural size changes was verified. The results of this study are intended to provide a reference and experience for subsequent prefabricated structure designs and engineering applications.

To enhance the emergency response capability of subway waterlogging, this study investigated waterbarrier technologies and devices for subways, both domestically and internationally. A systematic review of conventional and innovative subway waterbarrier technologies and devices was conducted, focusing on subway waterlogging risk points such as station entrances/exits, vent shafts, main tracks, and vehicle depots. The advantages and disadvantages of various subway water barrier technologies and devices were analyzed. This study discusses the challenges faced by subway water barrier technologies and devices in terms of cost economy, intelligence, automation, and sustainability. Recommendations are provided for structural optimization, material improvement, multifunctional water barrier devices, intelligent and automated control, green technology, and sustainable development. The results indicate that different waterbarrier devices are suited to various application scenarios. Water barrier devices should be selected based on risk points and flood characteristics. Conventional subway water barrier devices are widely used and are technologically mature. Compared with these technologies, new technologies have advantages in terms of automation, resourcesaving, and improved emergency reliability. This study aims to serve as a reference for the design, installation, and application of subway waterbarrier devices, providing technical support for ensuring the safe operation of subway systems and essentially responding to subway waterlogging.

As property development above vehicle depots becomes increasingly common, it's crucial to address the construction and operational challenges this poses to the underlying facilities. This necessitates adaptive adjustments and optimizations in various aspects of depot design, including overall layout, fire safety, traffic management, utility systems, and vibration and noise mitigation. By comparing developed and undeveloped vehicle depots, this study proposes an optimization strategy centered on "one core concept and two principles." This approach aims to create favorable conditions for aboveground development while safeguarding the underground facilities' safety and environment, without compromising the depot's scale and functionality. The study outlines optimization strategies across multiple areas, including site selection, layout planning, maintenance procedures, emergency evacuation, ventilation and smoke control, and traffic flow. Specific recommendations include improving stationsection relationships, maximizing land use efficiency, implementing advanced maintenance equipment, and enhancing evacuation and smoke management systems. The ultimate goal is to minimize the negative impacts of aboveground development, fostering a harmonious relationship between the aboveground and underground facilities for mutual benefit.

Airport rail transit lines serve large airports and differ from ordinary urban rail transit lines in terms of functional role, passenger service, passenger flow characteristics, and service standards. Transport service standards for this type of particular transit line need to be improved. To meet the rapid distribution needs of airport passenger flow and enhance the quality of airport passenger services, designing specific service standards is essential. First, the particularity of the special line is analyzed from the perspectives of service passengers, technical conditions, passengers' travel needs, etc. Second, the existing service standards for rail transit are examined, and the necessity of establishing transport service standards for these special lines is elaborated. Finally, suggestions for designing service standards from the aspects of design principles, standard framework, and key contents of services are provided. This study aims to provide a reference for formulating service standards for special rail transit airport lines.

The design standards for the roadbed structure of the metro depot have not been clearly defined in the Metro design specification (2013)," and the current practice of using the main line standard results in high and unreasonable costs. This study relies on the Zhengzhou Metro Tieluxi Depot project to conduct a numerical simulation analysis of dynamic loads under different subgrade structures and to study the variation law of the dynamic load distribution. The dynamic load generated by the ballastless track at the same train speed was smaller than that generated by the ballasted track. An increase in the thickness of the subgrade surface layer has a more substantial impact on reducing the dynamic load generated by the train operation. However, an excessively thick foundation increases roadbed stiffness, which is not conducive to stress dissipation. Hence, when the foundation thickness increases to a certain extent, the effect of reducing the dynamic loads gradually becomes less significant. The numerical simulation results show that the design scheme of the metro depot subgrade can appropriately adjust the parameters on the basis of "0.3 m+0.9 m" and "0.4 m+0.7 m", ensuring that the dynamic and static stress ratio of the subgrade is strictly less than 0.2, attaining the best level of safety and economy.

To address the issue of incompatibility between the China Train Control System (CTCS) system used in mainline and intercity railways and the Communication Based Train Control (CBTC system) used in urban rail transit, which hinders the integration of the four networks and reduces the overall transportation efficiency of the rail transit system, research is conducted on main technologies such as onboard equipment, ground equipment, overlapping area design, and system switching process that support the integration of the four networks in the train control system. First, key technologies for integrated onboard equipment were proposed, including automatic train protection technology, automatic train operation technology, humanmachine interface technology, and train interface technology. Second, key technologies for ground equipment in overlapping management areas that support crossline operation of trains were presented, and the overlapping management area design technology that supports safe and smooth switching of train control systems without stopping was provided. Lastly, the system switching process of trains switching from CTCS to CBTC and from CBTC to CTCS without stopping in the overlapping area was explained. The research results suggest that crossline operation can be achieved by integrating onboard equipment that is compatible with ground equipment, reducing the number of ground equipment, simplifying the system structure, and enhancing system safety, reliability, and maintainability while also offering cost advantages. Adopting integrated onboard equipment with a simple system structure, low equipment cost, and minimal space requirements for installation is the future direction of technological development. The key technologies of the train control system compatible with CTCS and CBTC proposed can be used to guide system design, research and development, and application, which has guiding significance for achieving "four network integration."

Concerning the noise pollution caused by the operation of the ground line of urban rail transit, the access line of the Zhongzhou Avenue depot in Zhengzhou Metro Line 5 is taken as an engineering example. The noise is tested in situ before and after the installation of sound barriers, and the noise reduction process is simulated with Virtual Lab software. The simulation results are in good agreement with the tested sound pressure level changing with the sound source frequency, and the accuracy of the acoustic simulation model and calculation method is verified. The insertion loss of sound pressure level is adopted to characterize the noise reduction effectiveness of the sound barrier, and further research are conducted on the noise reduction effectiveness of triangular wedge, QRD (Quadratic Residue Diffuser) sequence, PRD (Prime Root Diffuser) sequence and micro perforated panel PRD I composite sound barrier, and the results reveal that the wedge angle significantly impacts the noise reduction effectiveness of the triangular wedge sound barrier; greater irregularity enhances the diffusion effect for diffracted sound in PRD sound barriers, and PRD sound barriers exhibit better noise reduction effectiveness than QRD sound barriers; the overall noise reduction effectiveness of PRD type I sound barrier is slightly higher than that of PRD type II sound barrier, to reduce appropriately the design frequency of the diffusion body, increase the order, and expand the slot width can advance the noise reduction performance of the PRD type I sound barrier; to add micro perforated plate resonance sound absorption structure in the diffuser end groove of micro perforated panel PRD I composite can further improve the noise reduction of the end structure of diffuser, which would have an ideal application prospect for improving the noise environment of metro access lines.

The mechanism of the geological deformation caused by shield tunneling construction was combined with a threedimensional numerical simulation method to simulate the displacement of bridge piles during the smallangle side crossing of highspeed railway bridge group piles in subway shield tunnels constructed in sandy areas. Analyses were conducted on the mechanism of the impact of metro shield tunnels on highspeed railway bridges when the shield reaches the front of the piles, reaches the piles, and moves past the piles, as well as when the shield tail is detached and after the shield passes the piles. Three protection plans were then proposed for highspeed railway bridges, which included isolation pile measures, geological reinforcement measures, and isolation piles + geological reinforcement. Threedimensional numerical simulations were used to analyze the entire process of shield tunnel boring through the pile groups of highspeed railway bridges under the conditions of no protection scheme and when adopting the above three protection schemes. The findings revealed that without protective measures or with the sole use of ground reinforcement or isolation piles, the deformation of a highspeed railway bridge exceeds the allowable standards during the lateral passage of a shield tunnel. However, with the implementation of both isolation piles and ground reinforcement, the deformation remains within the prescribed limits. After the scheme comparison, the design scheme of isolation piles and ground reinforcement were ultimately adopted for implementation. During the onsite implementation, the entire process was monitored, and the monitoring results were consistent with the numerical calculations, verifying the rationality of the highspeed railway bridge protection plan.

To investigate the sources and distribution patterns of PM2.5, PM10, and total suspended particulates (TSP) in subway stations, this study conducted particulate matter concentration tests at 11 stations along two subway lines in a city. The test areas included outdoor locations, station public areas, equipment management rooms, and corridors inside the platform end doors. The concentrations of PM2.5, PM10, and TSP in each area were measured, and elemental analysis of the outdoor and platform particulates was performed. Subsequently, the distribution patterns of PM2.5, PM10, and TSP in various areas at different outdoor concentrations were analyzed. Based on the test results, suggestions for subway particulate matter prevention and control measures were proposed. The research revealed a significant increase in iron content in particulate matter within stations compared to outdoor areas. Particulate matter containing iron in subway stations often exhibits irregular sheetlike shapes, differing from those found outdoors, indicating that railwheel friction is the source of these particulates. When outdoor particulate matter concentration levels were low, the distribution patterns of particles of various sizes were similar, generally exhibiting higher concentrations in the tunnels than in the stations and outdoors. However, when outdoor particulate matter concentration levels were high, PM2.5 and PM10 concentrations were higher in tunnels than in outdoor areas and stations. Regardless of outdoor particulate matter concentration, TSP concentrations in public areas and carriages were consistently higher than outdoors. These findings provide valuable insights for developing effective particulate matter prevention and control measures in subway systems.

In recent years, with the comprehensive transformation and upgrading of the national economy, Beijing's urban development model has shifted towards a more scientific, sustainable, and highquality approach. The relationship between rail transit and urban development has been reevaluated, leading to the emergence of the "urban followtrack construction" planning concept. This study examines the current issues in Beijing's rail transit system, summarizes the experiences of integrating and developing rail transit station cities, reviews recent policy guidelines related to stationcity integration in Beijing, and offers new insights and perspectives on the station planning concept for rail transit lines. In terms of urban rail transit network planning, the focus is on selecting appropriate corridors and nodes to enhance interaction with urban planning. For route planning, attention is given to resource matching between stations and surrounding land, aiming to balance the planning and construction processes for mutual benefit. By integrating the lessons learned from actual engineering projects, this new planning concept is applied to practical engineering, providing a reference for the integrated development of Beijing's rail transit station cities.