To identify key stations in urban rail transit networks and study their evolution over multiple years, we developed a key station recognition method based on truncated singular value decomposition (TSVD). We selected origindestination (OD) data from the morning peak hours between 2011 and 2019 in Beijing as the dataset. The analysis involved evaluating the evolution of network passenger flow and identifying key stations in subway networks using key eigenvectors. These results were then compared with those obtained from complex network methods. The analysis demonstrates that TSVD can effectively identify key network stations by considering the OD distribution. The outcomes from TSVD better represent the spatial distribution of network passenger flow than traditional methods. The results revealed that the spatial layout of key stations in Beijing's urban rail transit has evolved towards multiple centers, such as Northwest Xi’erqi and Southwest Fengtai Science Park. These stations are gradually forming network passenger flow centers and establishing connections. Additionally, stations like Southeast Tu Qiao and Northeast Fengbo are showing preliminary trends toward becoming network passenger flow centers.

To address the shortage of realtime data and the accuracy limitations of existing automatic line control systems, we propose an intelligent upgrade scheme for train control systems. First, considering the distinct characteristics of electric and air braking in train operations, we developed accurate braking models for both systems, incorporating the switch between electric and air braking. Next, we optimized the ATO controller and applied a sliding mode adaptive robust control strategy. This strategy adjusts the controller in real time, enhancing its robustness and adaptability to varying vehicle parameters and external environmental interferences. Using Beijing Metro Line 5 as a case study, we simulated the precise train braking model and the sliding mode adaptive robust controller to calculate the stopping accuracy and speed error of the train. The results demonstrate that, compared to proportionalintegralderivative (PID) control and sliding mode control, the proposed control algorithm significantly reduces parking accuracy and speed errors. Specifically, the average parking accuracy achieved is less than 8 cm.

To address the urgent need for vibration and noise reduction in the development of upper covers, this paper summarizes existing control measures for tracking vibration and noise in depots, emphasizing the necessity of implementing seamless rails in depot lines. We also examine the requirements for sleepers. Our calculations indicate that depots can meet the strength and stability requirements for seamless lines by using arm span resistance pillows in conjunction with other strengthening measures. Additionally, this paper introduces a seamless turnout technology for No.7 movable turnouts and verifies their seamless integration based on actual usage conditions in Beijing. The findings suggest that both the turnouts and the turnout groups are suitable for seamless application. A comparative test conducted at a speed of 15 km/h reveals that the movable turnout reduces vibration and noise by 35 dB compared to fixed turnouts.

This paper proposes an automated method for generating parametric BIM pipe fittings to tackle the complexity of urban rail transit pipelines and reduce the reliance on manual intervention for generating 3D models. The method addresses the challenge of accurately determining the start and end coordinates of pipelines due to irregularities during the drawing stage. The proposed approach employs spatial vector operations to automatically identify the types of fittings (such as elbows, tees, and crosses) required between two, three, and four pipelines based on the centerline coordinates of straight pipes. It then calculates the shape and positional parameters of these fittings by referencing standard dimension tables. The model is expressed using industry foundation classes (IFC), and the implementation leverages the C++ language to achieve the automatic generation of models. Verification of the method demonstrates significant improvements in efficiency and automation in the generation of piping models.

An integrated spatial finite element model of railbridgepier was developed and validated to investigate the effect of temperature on the interaction between bridges and rails, particularly focusing on smallradius curved bridges used by trams. This study compared and analyzed the bridgerail interaction laws between straight bridges and smallradius curved bridges. It specifically examined the additional expansion force of the rail, lateral forces at the top of bridge piers, and longitudinal forces under overall and local heating conditions. Under overall heating conditions, the research found that smallradius curved bridges experience greater lateral displacement of the steel rail and higher lateral forces at the top of bridge piers compared to straight bridges. Moreover, as the bridge temperature increased, the additional expansion force of the rail also increased. Calculations using overall heating conditions resulted in larger expansion forces and longitudinal forces on the top of piers compared to local heating conditions. Based on these findings, three different fastener arrangement schemes were proposed and evaluated. It was observed that fasteners with lower resistance could effectively reduce the additional expansion force of the rail. However, insufficient longitudinal resistance might increase the risk of rail joint fractures. In conclusion, the study provides valuable insights for designing continuously welded rails on smallradius curved bridges for tram systems, offering guidance on optimizing fastener arrangements to mitigate rail expansion effects while ensuring structural integrity.

This study addresses the environmental vibration issues of adjacent brickconcrete structures induced by subway operations, focusing on a 7story brickconcrete building as the primary investigation subject. Vibrations were measured at the tunnel, outdoor ground level, and various structural floors to analyze the propagation characteristics along the “tunnelgroundstructure" path. The study aims to identify reasons for vibration levels exceeding standards. Key factors contributing to the issue include the shallow depth of tunnel burial, the proximity of buildings to the tunnel, and their shared soil layer, resulting in inadequate vibration attenuation through the soil. Additionally, resonance effects within specific floor slabs of the structure contribute to vibration responses surpassing evaluation standards outdoors and on the first indoor floor. A finite element model of the brickconcrete structure was constructed using measured vertical accelerations at column bases as loads. The model's accuracy was validated against measured floor responses, confirming amplification effects on middle and upper floors. Parametric analysis explored the impacts of floor count, story height, slab thickness, and wall thickness on the spatial distribution of vibration responses. The findings from this study provide valuable insights for evaluating environmental vibrations in similar structures, offering guidance for mitigating effects and ensuring compliance with vibration standards.

To address the challenges posed by traditional opencut methods in subway station construction, such as disruptions, shop demolitions, and relocation of underground pipelines, this study investigates the construction technology of jacking a rectangular tube for a subway station, focusing on the Haibang Station of the Guangzhou Metro Line 3 East extension project. Initially, three different combinations of pipe jacking schemes are proposed, each with unique characteristics tailored to the specific station engineering requirements. Selection among these schemes is based on practical considerations. Subsequently, the study details the section design, selection of jacking equipment, design of pipe sections, and implementation of waterproofing measures for the station. Finally, the feasibility of employing the combined pipe jacking method is validated through theoretical calculations and numerical simulations. The results demonstrate that the construction technology of jacking a rectangular tube for subway stations effectively addresses the challenges associated with underground pipeline integration. It ensures safety and feasibility in subway station construction. This approach offers a promising alternative to traditional methods, potentially minimizing disruptions and optimizing construction efficiency in urban environments.

This study investigated and analyzed the assembly attitude of prefabricated partition walls on the Shanghai Airport Link Line to ensure high assembly quality within largediameter shield tunnels. Initially, the coordinate system of the partition walls was established. Subsequently, the study examined the assembly attitude under initial assembly errors and errorfree scenarios. It focused on obtaining precise attitude information and the analytical expression of the partition wall's bottom plane equation for each operational condition. The analytical results reveal the following: 1) In scenarios where there are no initial assembly errors or where errors are limited to translation or rotation, the selection of control points and jacking sequences within the regulating system does not affect the assembly quality of the partition walls. The assembly attitude can be effectively managed using the derived expression for the wall's attitude. 2) When initial assembly errors extend beyond simple translation or rotation, precise control of the partition wall's attitude becomes crucial. This involves adjusting the jacking sequences within the regulating system accordingly. Utilizing the obtained expression allows for improved assembly accuracy of the partition walls. 3) The study successfully applied an analytical formula to constructing partition walls, demonstrating favorable engineering outcomes in practical applications.

To address these challenges, a pragmatic design approach for the subway track panel and the substantial opening in the panel significantly reduces plate stiffness. Under construction conditions, traditional twodimensional frame section calculations fail to meet design requirements and realworld conditions. Drawing from a specific case involving the design of a stacked subway track panel in the highwaterpressure fine particle strata east of Beijing, this paper introduces the project's envelope and main structural design concepts. It examines critical structural calculation issues, consolidates design insights, and outlines operational conditions. The study yields a practical design scheme, offering valuable insights for future subway track panel designs during construction processes.

In order to enhance the excavation efficiency of an EPB/TBM dualmode shield machine and minimize disc cutter wear, the study was conducted on the performance of disc cutters along the Intercity Railway from Airport East Station to Huangmabu Station, Shenzhen. The research focused on the fullsection hard rock strata from ZDK8+583.0 to ZDK8+359.8 on the left side of the tunnel. Initially, the study analyzed cutter replacement conditions and wear patterns based on different functions and types of disc cutters to determine optimal performance criteria. Subsequently, the service life of the disc cutters under optimal conditions was evaluated to guide replacement scheduling. Finally, a tool information management system tailored to the project's requirements was established. The findings highlight that China Railway's wideblade disc cutter is wellsuited for excavating this specific formation. The implemented tool management system effectively manages comprehensive information about the tools, which helps ensure costeffective and efficient onsite operations. This research serves as a practical guide for choosing disc cutters for shield tunneling machines. It promotes better information management practices for disc cutters, leading to safer and more efficient operations.