大跨度软岩隧道浅埋区开挖方法优选

Optimal excavation method selection of large-span soft rock tunnel in shallow-embedded region

以集呼高速旗下营隧道为工程背景,采用ABAQUS有限元软件,就三台阶七步开挖方法与CD法的全过程进行了数值模拟,通过两种工艺下地表沉降、拱顶沉降、周边收敛的对比分析表明,CD法更适合于旗下营隧道的施工。

Taking Qixiaying tunnel on Ji-Hu highway as the engineering background, applying ABAQUS finite element software, the paper carries out numerical simulation of three-step and seven-foot method and CD method. Through comparing the surface subsidence, top arch subsidence and surrounding convergence of two methods, it finds out that CD method is more suitable in Qixiaying tunnel construction.