大断面浅埋隧道进洞施工方案

Entrance construction scheme of the shallow big cross-section tunnel

结合具体工程实例,介绍了大断面浅埋隧道进洞施工方案,分析了微台阶法工艺原理及微台阶法的具体施工步骤,得出了微台阶法施工可以有效地控制超挖,并减少对围岩的破坏影响的结论,从而推广微台阶法在大断面浅埋隧道中的应用。

Combined with the concrete project example, the author introduces the entrance construction scheme of the shallow big cross-section tunnel, analyzes the process principle and the concrete construction procedures of the micro-bench method, draws a conclusion that the microbench method can effectively control the overbreak and reduce the damage to the surrounding rock, to popularize the application of the microbench method in the shallow big cross-section tunnel.