Application and Exploration of Underground Excavation Technology in Shanghai Rail Transit Stations

Abstract

Objective With years of development, Shanghai urban rail transit is now facing an extremely complex and demanding construction environment. Issues such as traffic congestion, housing demolition, and pipeline relocation caused by large-scale open excavation of underground stations have gradually become the focal points of public concern. In response to the conflicts and contradictions between metro construction and surrounding environment, Shanghai rail transit proposes several underground excavation technologies for soft soil stratum through continuous technological breakthroughs and experimental validation. Method The development history and current application status of underground excavation technology are introduced. Based on the characteristics of Shanghai rail transit construction, the specific connotations and application scenarios of pipe jacking method, freezing method, and pipe roofing method in Shanghai rail transit underground excavation technology are introduced. Furthermore, the research and pilot applications of new underground excavation station construction technologies such as large-section pipe jacking, ultra-long and extra-large-section pipe curtain method, ultra-shallow buried large-section freezing method, and bundled pipe curtain method are explored. Result & Conclusion Shanghai rail transit underground excavation technology primarily include shield tunneling method, pipe jacking method, freezing method, pipe roofing method, and other special underground excavation methods. These techniques are widely applied in various projects such as underground interval engineering, interval connecting passage engineering, station auxiliary structure engineering, and partial station renovation engineering. New underground excavation station construction technology effectively address the unique characteristics and challenges of Shanghai rail transit construction under new conditions.

Keywords

• shanghai rail transit
• station
• soft soil stratum
• complex environment
• underground excavation technology