Issues and Reflections on Development and Construction of Urban Rail Transit Leftover Underground Spaces

Urban Rail Transit Leftover Space refers to the structural space generated due to cost-saving considerations in deep underground stations or sections through a cut and cover method, where no backfilling is made. In response to high-quality urban development, utilizing such existing assets has great practical significance in improving the efficiency of urban land utilization, revitalizing idle assets, and supporting the construction of urban rail transit. This paper summarizes the engineering characteristics of these spaces, explores pain points in the development and construction process, and provides targeted countermeasures and suggestions. Finally, this paper proposes strategies for utilizing urban rail transit leftover spaces based on the Integrated Shared Corridor Project in Chengdu High-tech Industrial Development Zone, for reference.