大跨度公路隧道断层破碎带施工

Construction of Large Span Highway Tunnel in Fault Area

大跨度浅埋隧道采用新奥法施工时 ,常会遇到地下水、断层软弱围岩等不良地质 ,造成初期支护收敛变形大 ,围岩松驰难以稳定的问题。文章结合工程实际 ,从隧道开挖方式、支护手段、超前小导管注浆。

Bad geological condition such as groundwater,fault and weak ground will be encountered during the construction of large span and shallow buried tunnel with NATM,which causes large deformation of primarq support,surrounding rock loosening and unstability.This paper,combining with a real project,introduces the construction of large span highway tunnel from such aspects as excavation method,suport technique,advanced small pipe grouting and monitoring.