Monorail transportation systems currently face challenges such as relatively independent specialties, numerous workstation terminals, high usage, and elevated management and maintenance costs. Additionally, data interconnectivity between subsystems is lacking, making coordination and command difficult in the event of faults or accidents. This paper presents a comprehensive analysis and research on these issues, focusing on data control, subsystem business implementation, and operation and maintenance requirements. The paper elaborates on an architecture scheme for a deeply integrated monorail comprehensive operation and dispatch system based on a unified software/hardware platform and humanmachine interface across various professional subsystems. It explores the application of this scheme in different scenarios, including upgrading existing lines, constructing new lines, and achieving networklevel integration. The proposed system addresses the needs of data control and comprehensive intelligent operation and maintenance by integrating the architecture of center, station, and depot/parking lot system equipment, as well as integrating or interfacing various subsystems. This allows for monitoring and control of various professional system equipment on a unified platform. The analysis demonstrates that adopting a single track system with comprehensive operation scheduling significantly enhances system integration, simplifies job positions, and effectively reduces construction and operation costs. The comprehensive operation and dispatch system enables the interconnection and sharing of various professional resources, providing users with complete and rich information support within a unified platform during emergencies or equipment failures. Through intelligent linkage and other automatic control technologies, operational efficiency can be considerably improved. The integrated operation and dispatch system solution aligns with the development direction of integrated, simplified, and streamlined monorail transportation systems. It is expected to be the future trend for China’s monorail transportation operation and control systems.

In response to the problems of unclear and insufficient connection paths and depth between urban rail transit industry planning environmental impact assessment (EIA), project EIA, environmental acceptance, law enforcement supervision, and regional ecological environment zoning control (zoning control), this study summarizes the characteristics and key contents of rail transit planning EIA and project EIA. Referring to the linkage requirements of rail transit planning EIA and project EIA, the connotation of listbased management is analyzed, and the feasibility of implementing listbased environmental management in the rail transit industry was analyzed. Lists for zoning control, planning EIA, project EIA, environmental acceptance, and law enforcement supervision are developed. The connection paths and methods for listbased environmental management in the rail transit industry are proposed. Research has shown that inventory management is an important measure for improving environmental management in the rail transit industry and has the conditions for implementation. The zoning control, planning EIA, project EIA, environmental protection acceptance, and law enforcement inspection checklists transmit different management requirements from front to back, while providing feedback on different management effectiveness information from back to front. Through different management lists, the approval department, planning department, construction unit, evaluation unit, and law enforcement department can identify key points that their respective departments and units should focus on, implement environmental access and environmental protection measure requirements, and provide technical paths and methods for promoting comprehensive environmental management of the rail transit industry.

The urban rail transit projects in China have adopted overhead contact system power supply and dedicated rail return current scheme to solve the problem of stray current leakage. However, there are currently no applications of dedicated rail return under contact rail power supply systems in China. This article proposes four dedicated rail return current schemes based on the contact rail power supply systems. It analyzes and evaluates these four schemes through quantitative and qualitative methods, considering aspects such as equipment impact, vehicle current return, networked operation of lines, power supply system protection, safety, and costeffectiveness. It discusses the feasibility, advantages, and disadvantages of each scheme, and ultimately recommends a dedicated rail return scheme based on the contact rail power supply system. Finally, it proposes a recommended dedicated rail return scheme based on the contact rail power supply system, and summarizes the impact of dedicated rail return on other disciplines.

This study addresses the current lack of experience in network operations of urban express lines based on fully automated operation technology in China, as well as the lack of corresponding operational reference standards and comprehensive technical solutions. Through the study of relevant literature and empirical analysis of the operation schemes of Chongqing Suburban Railway Bitong Line and Urban Rail Express Line 27, this study investigates the network scheduling, train planning, and train organization of urban express lines based on fully automatic operation technology. This study proposes the integration scheme of personnel (except train dispatchers) in the network dispatching hall and the arrangement scheme of multiple lines in the form of grouping under the network operation conditions of urban express lines interconnection. The study also proposes the establishment process and principles of the train operation plan, the operation organization principles under normal and abnormal operation scenarios, and the crossline operation scenarios between fully automatic and nonfully automatic trains. Through research, we aim to achieve an interconnected and network operation technology solution that integrates resources and improves efficiency across the entire line network, which is conducive to achieving automatic crossline operation between urban express lines, improving service levels, and promoting the construction of smart urban rail transit.

The control of micro deformation of adjacent buildings during the construction of deep foundation pits in weak strata is one of the challenges in the geotechnical field. Taking the construction project of subway deep foundation pit of adjacent buildings in soft ground in Hangzhou as an example, this paper introduced the micro deformation control technologies such as the reinforcement technology of underground continuous wall trough wall, sleeve valve pipe grouting reinforcement technology, servo steel support system, and the reinforcement and excavation technology of underground middle wall, and analyzed the deformation characteristics and the effect of micro deformation control technology in the construction of deep foundation pit of adjacent buildings in soft ground. The results indicate that the sleeve valve pipe grouting reinforcement technology reduces the impact of construction on the surrounding building group and suppresses its deformation; the deformation of the enclosure structure and surrounding deformation can be suppressed through slot wall reinforcement technology, and the quality of the enclosure structure has been improved; the servo steel support system effectively suppresses the deformation of the enclosure structure and reduces the impact of construction on the surrounding area; cross wall and block excavation technology suppresses building deformation and weakens the impact of spatiotemporal effects. In the end, the surrounding buildings of the deep foundation pit basically achieved the goal of "micro deformation”.

In order to solve the problem that the traditional monitoring analysts in the field of urban rail transit have a high falsenegative rates and complex parameter adjustment of abnormal behaviors such as falling, fainting and fighting, making them difficult to apply efficiently to actual urban rail station monitoring scenarios, this paper proposes a human posture feature recognition framework based on skeleton pattern recognition, introducing the attitude estimation technology based on human skeleton. The Alpha Pose model is used to accurately estimate the posture of passengers, and combined with the Spatial Temporal Graph Convolutional Networks model, it achieves abnormal behavior recognition in the monitoring scenario of urban rail stations. By achieving 72.3 mAP on the COCO dataset and 82.1 mAP on the MPII dataset, the performance is improved by up to 17% compared to the OpenPose model, verifying the effectiveness and practicality of the model. The results show that the method proposed in this paper not only improves the recognition speed of passenger behavior but also has the ability to adapt to complex scenarios, providing a new technical solution for urban rail safety monitoring.

Aiming at the problem of excessive settlement of the station caused by the new tunnel close to the existing station, relying on the project of Xi'an Metro Line 8 close to the Convention and Exhibition Center Station of Line 2, the numerical simulation and onsite monitoring are used to analyze the control effect of various control measures on the deformation of the existing station during the construction of the underpass. The recommended values of construction parameters of the tunnel in the loess area are given. The results show that: (1) The construction method and excavation footage have obvious effect on the deformation control of the station when it is close to the underpass. After the construction method is adjusted from the upper and lower step method to the onsite CRD method, the maximum settlement of the station is reduced by 50%. After the excavation footage is adjusted from 1.5 m to 0.5 m, the maximum settlement of the station is reduced by 30%. (2) The staggered distance between the upper and lower pilot tunnels and the erection of temporary steel support have a weak effect on the deformation control of the station, which can be appropriately adjusted according to the engineering geology and onsite monitoring. (3) Based on the project, the construction scheme of onsite CRD method +0.5 m excavation footage +5 m singleside cavern upper and lower guide hole staggered distance +5 m spacing temporary steel support is adopted. The onsite monitoring data are basically the same as the deformation law obtained by numerical calculation. The maximum settlement of the station side wall, ballast bed and track is 3.76, 2.91, 2.51 mm respectively, and the maximum differential settlement at the deformation joint is 3.54 mm, which meets the requirements of the station deformation control standard.

Considering the problems of the difficult data collection, nonstandard models, and inaccurate data in the digitalization of existing buildings, the BIMbased digitalization method for existing rail transit projects was studied and proposed, according to the characteristics of rail transit projects. First, based on data requirements of the operation and maintenance management, an overall framework for BIM digitalization and scenario applications in existing rail transit projects was developed. Second, the technical guideline for BIM modeling and delivery was studied and established, and a BIM component standard library was developed to standardize the creation of BIM models of existing rail transit projects. Third, according to the onsite data collection situation, different methods were adopted to create BIM models of existing rail transit projects. When the drawings were complete, models could be created based on the drawings. When some drawings were missing, the BIM model creation method based on the on-site images and point cloud data was studied through component feature recognition and matching component units in the BIM component standard library. Finally, to ensure the quality of BIM models, a compliance checking tool with embedded BIM standard specifications was developed for automatic model verification. Additionally, on-site inspection was conducted for various professional BIM models. The BIM construction of existing operating lines in Shenzhen Metro is being carried out, accumulating BIM-based digital assets, which provides reference for the BIM construction of existing operating lines in other cities.

The government has proposed establishing a dedicated public safety chapter within the preliminary design documentation for urban rail transit systems. This study examines the compilation and review processes for this public safety chapter. The research first analyzes public safety risks and security standards in urban rail transit, proposing a modular approach to the chapter's organization. This comprises three key modules: counterterrorism and riot control, emergency management, and law enforcement support. Secondly, the study establishes that the review framework should be comprehensive, hierarchical, and forwardlooking. It systematically categorizes the primary review criteria across three dimensions: legal regulations, technical standards, and policy requirements. Finally, for the review process itself, the research proposes a fivestage framework: project initiation, preliminary assessment, onsite evaluation, formal review, and completion. For each stage, the study defines the participating departments, work scope, and required documentation. The findings have established standardized workflows for all phases and stakeholders involved in both compiling and reviewing the public safety chapter. This framework serves as a valuable reference for provinces and municipalities implementing similar initiatives.

Addressing the compatibility issues of platform screen door (PSD) systems across different lines and vehicle types within the context of "fournetwork integration," this study innovatively proposes a design scheme for an adaptive PSD system, encompassing comprehensive solutions such as improving mechanical structures, optimizing control system algorithms, enhancing intelligence levels, and bolstering gap detection system capabilities. These solutions aim to elevate the flexibility and safety of PSD systems, thereby better accommodating the needs of diverse vehicle types and operational modes. By facilitating the adaptability to multiple vehicle types, they contribute to reducing station sizes and lowering construction costs for urban rail transit. This research provides valuable reference and insights for the upgrading of PSD systems under the backdrop of "fournetwork integration" in urban rail transit. By optimizing the design and functionality of PSD systems, it can effectively mitigate the impact of multiple vehicle types on PSD systems, further facilitating the smooth implementation of "fournetwork integration."