STUDY ON THE MINIMUM SAFE THICKNESS OF WATER-PROOF ROCK MASS IN KARST CAVE OF DEEP BURIED TUNNEL
The excavation of deep-buried karst tunnels often induces the surrounding rock water inrush disaster.Considering the water pressure of the karst cave,the variation law of plastic zone of surrounding rock is studied when the water filled karst cave is located in different directions,different distances,and different buried depths of the tunnel.The results show that when the karst cave is located under the tunnel,the water pressure in the cave has the most significant effect on the rock mass support;when the karst cave is located at the top of the tunnel,the safety thickness of the anti-outburst layer has the greatest influence on the tunnel safety,in which safety thickness of an-ti-outburst layer increases with the increase of tunnel depth,and the calculated minimum safe thickness is 3.9～13.1m.At any location,the safety thickness T of the anti-outburst layer increases with the increase of the tunnel buried depth.The prediction model may provide the reference for the prevention and control of tunnel water inrush disaster.
deep buried highway tunnelkarst cave water inrushoutburst barriersafe thickness
万方数据
维普
