To explore the impact of travelers' subjective spatial perceptions on travel behavior in the context of distinct urban terrain, this study takes Lanzhou, a typical rivervalleytype city, as an example. It establishes an integrated model of SEMLogit and explores the impact of the spatial perception of rivervalleytype city travelers on rail transit travel mode choice based on questionnaire data. The results show the following: ① Compared with the logit model without considering travel space perception, the goodness of fit of the logit model considering travel space perception by SEM increased by 0.234, and the prediction accuracy increased by 7.75%. ② The spatial perception of travelers in rivervalleytype cities has a significant positive impact on the choice of rail transit travel intention and behavior. ③ The spatial perception of travelers in the rivervalleytype city from five aspects, including the unnecessary detour, rivers in the river-valley-type city, wasp waist blockage, convenience of inter-group travel, and degree of being affected by road slope, l significantly influences travelers in the river-valley-type city to choose rail transit. The degree of influence decreases sequentially among these factors.

Electropneumatic braking is the most common braking method adopted by most urban rail trains. However, the disadvantages of poor controllability and slow response of air brakes result in inaccurate parking and poor comfort. In addition, there are issues, such as greater losses. The solution to address these issues is to replace existing air braking with electric braking, which is an ideal solution. Based on the development history of full electric braking, this study elaborates on the current situation and the main problems that must be overcome in the application of full electric braking. From the perspectives of high and low speeds, this paper provides a detailed introduction to the difficulties in achieving full electric braking and their corresponding solutions. Each difficulty is analyzed and summarized, and future development directions are discussed.

When a shortcircuit fault occurs between the positive pole of a highvoltage DC circuit for a train and its carbody inside the station in a straddle seat monorail DC traction system, this causes the carbody grounding relay (GR) of all trains inside the station to actuate and the circuit breakers of the train to trip. Meanwhile, this also triggers multiple 64D grounding protection actions and trips the circuit breaker of the DC feeder. The fault results in a loss of power to the DC traction system. It is necessary to identify the faulty train and restore the normal power supply of the DC traction system as soon as possible to reduce the impact of the accident. First, the study analyzed characteristic differences in the amplitude of the grounding current and negative receiving electricity current for a faulty train compared to a normal train when a shortcircuit occurred between the positive circuit and the carbody based on the equivalence model of the DC traction bipolar power supply system for straddle monorail transportation. Second, an identification method for a faulty train is proposed based on a comparison of the grounding current and negative current amplitude. The identification procedure is activated when the grounding current exceeds a predetermined threshold. If the grounding current amplitude is greater than the negative current, the train is identified as faulty; otherwise, it is considered to be in a normal state. The accuracy and effectiveness of this method were validated through MATLAB simulations and field tests. The proposed approach is simple, practical, and highly reliable, providing a strong safeguard for the safe operation of straddleseat monorail systems.

To verify the effects of rail damping devices in the rail corrugation treatment for vibration reduction tracks, rail damping devices were added to a laddertype sleeper track and a steelspring floating slab track, respectively, in this study. The vibration and trackside noise characteristics of the two vibrationreduction tracks were reported, and the development of rail corrugation was tracked. The results show that the rail damping devices installed on the laddertype sleeper track can achieve positive effects in vibration and noise reduction in a wide band range, which can reduce rail vibration and trackside noise by 9.7 dB and 11 dB (A), respectively. The rail damping devices installed on the steelspring floating slab track can reduce rail vibration and trackside noise by 8.3 dB and 3 dB (A), respectively, within their operational frequency range. Longterm tracking tests revealed that the installation of rail damping devices can at least halve the rate of rail corrugation development on vibration reduction tracks.

To address the challenges of high risk and extended construction periods associated with conventional methods for building longdistance connection channels, this study introduces a mechanical method in the composite formations of South China for the first time. Research focused on the overall project plan, selection of construction methods, equipment choices, and segment structure design, which led to the successful implementation of the project based on these findings. The following conclusions can be drawn: the mechanical method of connecting channels can solve engineering problems with long distances, large angles, and large inclinations and is applicable to composite formations in South China; it is feasible to change the assembly method of pipe segments from radial insertion to longitudinal insertion followed by radial insertion, by modifying the pipe segment design scheme.

To address issues related to the size effect of deep circular shaft excavation for rail transit, this study analyzes the stress and deformation characteristics of a circular excavation enclosure structure using the foundation pit project of the ShenzhenDaya Bay Intercity circular working shaft as a case study. The loadstructure method is employed to systematically examine these characteristics under various diameter conditions. The study compares the calculation results from both a 3D spatial structure model and a 2D elastic foundation beam model, discussing the impact of excavation size on the performance of the circular enclosure structure. The findings reveal that the circular diaphragm wall behaves as a quasicircular structure, generating a vertical bending moment due to soil and water pressure, which indicates a multidirectional stress state. It is feasible to utilize a simplified 2D equivalent model for designing a circularfoundation pitretaining structure, as its calculation results are more conservative than those of the 3D model. Furthermore, the spatial dimension significantly influences the performance of the circular enclosure structure, with noticeable circumferential effects observed when the diameter of the deep circular working shaft is less than 30 m.

In response to the increasing speed and strict requirements for bridge smoothness in the design of railelevated bridges, this study is based on the design of the elevated bridge of Beijing Metro Line 22 at a speed of 160 km/h. A new type of adjustable height device is developed and designed based on a lowmeltingpoint alloy as the height adjustment medium. A series of experimental studies are conducted, including the structural design of the device, indoor temperature and pressure tests, fullscale pressure adjustment performance tests of the compression shear machine, and onsite beam erection tests. The findings indicate that the new adjustable height device enables stepless bidirectional height adjustment with a rapid adjustment speed, completing height changes within 30 s. The device achieves millimeterlevel accuracy, and the alloy demonstrates excellent stepless adjustment performance and compression stability once cooled and solidified. The accuracy and stability of this adjustable height device not only ensure the smoothness of elevated bridge beams but also offer valuable guidance for engineering applications, such as replacing deteriorated bearings and adjusting for differential settlement in bridges.

To predict the vibration response of buildings along subway lines quickly and reasonably, a building structural system is decomposed into two parts, namely, a propagation structure and a response structure, based on the theory of mechanical mobility. The bearing structure is assumed to be a beam element model, and the slab structure is considered a plate element model. The mobility formula and the corresponding matrix expressions for each unit system are derived, and a traininduced structural vibration response model is constructed. The reliability and accuracy of the model are validated through onsite testing, showing that the predicted structural responses align well with measured vibrations in both time and frequency domains. In the frequency domain, the maximum error of the center frequencies of each 1/3 octave band does not exceed 5 dB, indicating that the proposed traininduced structural vibration response model can quickly and effectively predict the structural vibration response and that the outcomes can provide theoretical support for vibration prediction along subway lines.

To demonstrate the necessity and rationality of interconnecting Chongqing rail transit lines between core hubs based on the concept of urban rail transit interconnection, this study summarizes the macro positioning of planning fit, improving service quality, guiding urban development, and implementing resourcesharing using the example of Chongqing rail transit lines 26 and 27. It also analyzes the economic benefits, operating losses, and civil investment increases caused by the interconnection mode. With the effect of the time value, the converted net present was used as the measurement index of the necessity and rationality of the interconnection to exhibit rail transit lines 26 and 27 between the core hubs. The results demonstrate that the converted net present value of the interconnection with Chongqing rail transit lines 26 and 27 between the core hubs is greater than zero. The necessity for interconnection is significant, and the scheme is reasonable and should be recommended. Considering the necessity of urban rail transit interconnections, this study proposes an analytical framework that combines qualitative and quantitative analyses, enhances the research system of urban rail transit interconnections, and provides an effective reference for the planning and design of similar projects.

With the rapid pace of urban development, the speed of urban rail transit systems in various cities is gradually increasing. The transitoriented development (TOD) model, which focuses on the comprehensive development centered around public rail facilities, has been widely adopted. This has led to a rise in the number of transfer stations and integrated transport hubs. The TOD approach in domestic rail transit is becoming more diverse, and the integration of station cities helps rail transit TOD reach new levels. Largescale rail transit TOD projects generally require planning in the early stages of the project based on advanced planning and coordinated design methods, which are more conducive to the implementation of the main body to create a comprehensive transportation hub project with core characteristics in the area. This study focuses on the mismatch between the core development area of Dongguan and the timing of rail transit construction there. It summarizes the practical path from early planning to implementation based on line networks and detailed planning research and innovatively proposes the construction of public rail facility coconstruction engineering. Advanced planning, coordinated design, and integrated construction models have introduced new design concepts. The research results indicate that the construction of public rail facilities according to the underground space model has solved the problem of urban, comprehensive hub locations being unable to be developed synchronously because of their inability to initiate and implement rail transit projects, provides new research directions for subsequent project development, design, and implementation, and provides successful cases for government decisionmaking.