精选优质文档-倾情为你奉上超短台阶法在大断面黄土隧道施工中的应用超短台阶法在大断面黄土隧道施工中的应用 摘要：该隧道为本标段的重点工程和高风险控制工程，埋深浅、围岩条件差，全线为黄土Vb围岩，且下穿高速公路，施工难度大、风险高。本文就该隧道下穿大运高速公路的施工进行了总结。 关键词 隧道 超短台阶 施工方法 总结 AbstractThe tunnel for this section focuses on engineering and high risk control engineering, shallow buried depth, surrounding rock condition is poor, all fronts is loess Vb surrounding rock, and the underpass of freeways, big construction difficulty, high risk. In this paper, through the tunnel under the Dayun Expr
