上海轨道交通崇明线实现全线隧道贯通

Core Points - The Shanghai Metro Line 22 (Chongming Line) has achieved a significant milestone with the completion of the tunnel for the entire line, marking the longest subway tunnel crossing the Yangtze River in China [1][3] - The completed upward tunnel spans approximately 2,724 meters and faced geological and environmental challenges during construction [1] - The project team implemented advanced techniques to ensure safety and stability during the construction process, including a composite reinforcement method to manage complex water-bearing strata [3] Summary by Sections - Construction Progress - The entire tunnel for the Chongming Line has been successfully completed, facilitating subsequent construction phases such as track laying, electromechanical installation, and station decoration [3] - All eight stations of the Chongming Line have completed their main structural caps, and 28 tunnels have been fully connected [3] - Technical Challenges and Solutions - The construction faced significant challenges due to high groundwater levels and thick sandy layers, necessitating strict control over ground settlement during tunneling [1] - The project team utilized a combination of "stirring piles + jet grouting + horizontal freezing" techniques to create a reliable frozen curtain, effectively isolating groundwater and ensuring the safe reception of the shield machine [3] - Impact on Transportation Network - The completion of the Chongming Line will enhance the integrated transportation network in the Yangtze River Delta, providing more convenient travel options for residents [3]