单线铁路长隧道穿越溶洞施工技术

CONSTRUCTION TECHNOLOGY OF SINGLE-TRACK RAILWAY LONG TUNNEL CROSSING KARST CAVE

喀斯特地貌是通过地下水与地表水对可溶性岩石进行溶蚀与沉淀,侵蚀与沉积,以及重力崩塌、坍塌、堆积等作用而形成的地貌。对地面建筑物及地下建筑物施工造成很大的安全隐患,结合工程实例,采用辅助导坑绕行、溶洞软基层加固、超前管棚施作、桩基托梁技术及监控量测等措施,解决了隧道穿越大型溶洞的难题,总结了一套关键施工技术和其配套的施工机械设备并取得了良好的效果,对今后同条件下的隧道施工具有借鉴作用。

Karst landforms are landforms formed by the dissolution and precipitation, erosion and deposition of soluble rocks by groundwater and surface water, as well as gravity collapse, slump and accumulation. The construction of ground buildings and underground buildings will cause great safety hazards. The article combines engineering examples and adopts auxiliary guide pit bypass, karst cave soft base reinforcement, advanced pipe shed construction, pile foundation joist technology and monitoring and measurement measures, solved the problem of tunnel crossing large karst caves, summed up a set of key construction technology and its supporting construction machinery and equipment and achieved good results. It can be used as a reference for future tunnel construction under the same conditions.