大跨度软岩隧道开挖方法及施工方案数值模拟研究

摘要

With characteristics of the long span and soft rock tunnel, this paper analyzed the main factors affecting tunnel stability on the basis of the way of tunnel excavation method. ANYSYS, large finite element program, is used in Anhui wuhu Mt. Long tunnel, with a numerical simulation of three different way, the half section construction method, both sides construction method and CRD method. From the result of stress field and displacement field of the tunnel, some useful conclusions are obtained.%针对大跨度软弱围岩隧道自身稳定特点,分析了影响其稳定的主要因素,在此基础上选取对软弱围岩隧道稳定性影响较大的开挖方式这一因素,运用大型有限元程序ANYSYS,对安徽芜湖龙山隧道进行数值模拟,分析了上半断面超前法、两侧超前施工法和中壁CRD法3种不同施工方案下隧道围岩的应力场和位移场,得到了一些有益的结论.