APPLICATION OF VARIOUS EXPLORATION METHODS IN TUNNEL HYDROGEOLOGICAL INVESTIGATIONA CASE STUDY OF SHANCHONGJIN TUNNEL IN YILIANG TO SHILIN HIGHWAY, YUNNAN

When the proposed tunnel passes through the bottom of the surface water body, the influence of the surface water drainage and the leakage of the surface water body on the tunnel construction and operation is a special concern for the builders. In the tunnel hydrogeological investigation, hydrogeological survey, hydrogeological drilling, pumping test, water pressure test, field multi parameter water quality analyzer test, indoor water quality analysis test, drilling wave speed test were applied. The hydrogeological conditions of Qingcaoao reservoir and Qingshuigou reservoir in the tunnel area were identified through various exploration and testing methods. The hydraulic connection between the surface water of Qingcao'ao reservoir and Qingshuigou reservoir is not obvious. Tunnel excavation has little influence on Qingcao'ao reservoir and Qingshuigou reservoir, and surface water had little influence on tunnel water inflow. A variety of exploration methods can better identify the interaction between underground works and surface water bodies. It has great popularization and application value in the study of groundwater aquifer media and related investigation in the similar projects.