Feature and risk identification of super karst water burst in deeply buried karst tunnel
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Abstract:
With the acceleration of tunnel construction, emerging issue of high-pressure karst water burst becomes more and more complex, and the study subject of analyzing and grasping its features and taking effective risk control measures is still a world-class long-standing puzzle. Based on the feature analysis of the karst water burst disaster during the construction of karst tunnels at home and abroad, the special water burst accompanied with high pressure water burst, earth burst and rock burst is defined as super karst water burst. With the analysis of super karst water burst which happened in Maluqing Tunnel of Yi-Wan Railway, five basic characteristics of super karst water burst are obtained, and its risk sources are also identified from the respects both of geology and human engineering activities. Based on the theoretical analysis, numerical simulation and on-site engineering experience, several threshold conditions for the occurrence of super karst water are identified. In response to implementation plan of risk identification, the method of advanced horizontal drilling with drainage test and closed water test is also proposed.
