Abstract:

Water bursting hazard had taken a significant safety challenge to the deep buried tunnel engineering in the karst area of southwest China，and its prediction and risk assessment were still at the exploratory research stage. It was put forward that the most important issue in prevention and control of water inrush disasters was how to improve the accuracy of prediction and forecast in advance in deep buried tunnel construction.Based on the study of statistics and disaster formation conditions and control factors, five evaluation factors were selected, which were soluble rocks, geological structure condition and the surface catchment condition, the strength of groundwater cycles, the relationship between embedded depth of tunnel and underground water level. The index system of risk assessment on karst tunnel water inrush disasters was established, and quantitative methods of the evaluation indexes were discussed and studied. The study had provided deep buried karst tunnel construction with scientific and effective advanced geological forecast methods.

Key words: karst tunnel, water inrush, disaster risk, evaluation index system, quantitative method