超大断面浅埋隧道围岩变形的监测研究

Monitoring study of surrounding rock deformation of super large section shallow tunnel

针对超大断面浅埋隧道的特点,对福建省三明市莆炎高速岩头山隧道进行了地表下沉、隧道拱顶沉降、衬砌收敛等监测项目的监测分析,基于监测分析的结果,比较分析了该隧道在浅埋地段采用不同开挖方式围岩及衬砌的变形及受力特点,指出超大断面浅埋隧道采用不同开挖方式的自稳时空效应及各自优缺点,并为支护体系的优化提供了理论依据。研究结果可为类似条件下的工程设计、施工及检测提供借鉴。

According to the characteristics of the super large section shallow buried tunnel,the monitoring and analysis of the surface subsidence,the settlement of the tunnel vault,the convergence of the lining and other monitoring items are carried out for yantoushan tunnel of Puyan high speed in Sanming City,Fujian Province. Based on the results of the monitoring and analysis,the deformation and stress characteristics of the surrounding rock and lining with different excavation methods in the shallow buried section of the tunnel are compared and analyzed. The time-space effect of self stability of different excavation methods and their advantages and disadvantages provide theoretical basis for the optimization of support system. The research results can provide reference for engineering design,construction and testing under similar conditions.