A Study on the Strategy of Seepage Leakage Treatment of Highway Tunnels under a Long-Term Groundwater Table

Under the condition of long-term action of groundwater table, especially in the karst area, tunnels diseases, especially seepage leakage and lining deterioration, which threatening the safety of traffic and tunnel structure, appear gradually due to the changing groundwater flow path around tunnels with atmospheric precipitation in the catchment area and physical and mechanical properties worsen of surrounding rocks and soils. How to prevent and treat the diseases effectively have become an urgent problem to be solved. A comprehensive strategy, with the example of the Pishuangao Tunnel on Beijing-Zhuhai Expressway, combined with ground surface, surrounding rock and the lining treatment, after architectonic geology, hydro- and engineering geology, geophysics and engineering geological survey, was adopted by the authors, and it achieved a satisfactory result after two years verification.