黔张常铁路高山隧道巨型溶洞发育特征及工程评价

The Characteristic of Development and Engineering Evaluation of Giant Cave of Gaoshan Tunnel on Qianjiang-Zhangjiajie-Changde Railway

黔张常铁路高山隧道施工至DK53+678揭示一巨型溶洞,溶洞形态、分布规律极其复杂,施工难度及安全风险极高。为查明溶洞的发育特征及对工程的影响,通过采用地质调查、钻探、物探、三维激光扫描等技术手段,查明溶洞形态、堆积体特征、成因等溶洞发育特征及岩溶地表和地下水补给及排泄特征,对洞顶、洞壁稳定性等进行评价,为施工处理方案的制定提供重要的地质依据。

The construction of Gaoshan tunnel on Qianjiang-Zhangjiajie-Changde Railway to DK53 ＋678 reveals a giant cave,and the shape and distribution of the cavity are extremely complex,and the difficulty of the construction and safety risk are very high. In order to find out the development characteristics and the influence of the cave,the characteristics of the karst surface and the recharge and excretion characteristics of groundwater are identified by means of geological survey,drilling,geophysical and 3D laser scanning,and the stability of the roof and the wall is evaluated. The results provide an important geological basis for the formulation of the treatment scheme of the cave.