富水砂卵石条件下大断面市政隧道浅埋暗挖法研究

Study on the mining excavation of a shallow municipal tunnel with large cross-section embedded in water-soaked sandy cobble stratum

文章以成都市人民北路北延线隧道为工程背景,在深入分析富水砂卵石地层特性的基础上,以洞口小净距段为重点,采用有限元法对大断面浅埋暗挖法隧道各区段进行数值模拟分析,获得了地层、初期支护和二次衬砌的受力特征以及一些可供类似工程参考的有价值的结论。

Based on thoroughly analyzing the characteristics of water - soaked sandy cobble stratum, taking the tunnel project of north railway station in Chengdu city as the background, the paper carried out finite element analyses to study the behavior of stratum, primary support, secondary lining on each section of the shallow tunnel with large cross-section excavated by mining method, with emphasis on the portal section. Some worthy results were obtained that can be taken for reference by similar projects.