复杂地质条件下大跨双联拱隧道暗挖技术

The Long-span Double-arched Tunnel Underground Excavation Technology in Complex Geology

本文以复杂地质情况及周边环境下大跨浅埋隧道开挖方法为研究对象,提出了双联拱隧道综合开挖技术,在浅埋及软弱地段、隧道周边有重要建构筑地段采用三导洞开挖方法,而在围岩强度较高、完整性较好及周边无重要建构筑地段采用单导洞台阶法,视两侧围岩情况取消一侧或两侧导洞。

The peper uses the long-span shallow-buried tunnel method in the case of complex geology and the around environment as object of study,and puts forward the comprehensive excavation technology of double-arched tunnel. It uses the three-pilot tunnel method in shallow-buried and soft section,and the other important buildings and structures around the tunnel. When the rock strength is high and the integrity is good it takes the single-pilot tunnel bench method and cancel the side-pilot one side or two sides according to the surrounding rock condition.