岩溶地貌隧道穿越不良地质处理技术

Treating Techniques for Karst Tunnels Going Through Unfavorably Geological Areas

结合贵州省安紫高速公路项目岩溶地貌条件下旧州隧道施工,介绍了隧道穿越溶洞、采空区、背斜等不良地质段施工技术,通过采取回填浆砌片石、打设锚杆、超前管棚、泵送混凝土回填、吹砂回填等措施,取得了良好的效果,可为类似岩溶地区隧道溶洞、塌腔、涌泥等不良地质地段技术处理提供借鉴。

With the construction of the Jiuzhou Tunnel in the karst geological conditions of the Anzi Expressway in Guizhou Province as the technical background, introduced in the present paper is how the tunnel goes through the karst cavities, the goafs, the anticline and other unfavorably geologic sections, where backfill is carried out with mortar rubbles, anchoring rods are provided, the advanced tube-shed is set up, concrete is pumped for backfilling, and sand blowing backfill is performed, becaus of which technical measures good effects are achieved in the project. The paper may serve as a useful reference for the technical treatment for the construction of other tunnel projects going through similar karst cavites, colllapse cavities, mud gushing and other unfavorably geological sections.