Numerical analysis of thickness of critical outburst prevention layer of peripheral rock in karst tunnel
Using a tunnel project,based on the geological characteristics of karst areas,we established a generalized numerical model of the surrounding rock structure of the karst tunnel.Analyzing the failure process and law of the outburst prevention layer of the karst tunnel under different positions and working conditions of the water-filled karst cave,we proposed the thickness of the critical outburst prevention layer of peripheral rock at different positions.The results show that the karst development scale,rock thickness,karst cave location,and karst water pressure are the main factors resulting in water inrush disasters.When the karst cave is located at the arch waist,the maximum deformation of the plastic zone occurs in the center of the outburst prevention rock layer of the karst tunnel.From the variation law of displacement,stress,and pore water pressure,it can be seen that the karst cave has a greater influence on the stability of the surrounding rock of the tunnel when it is located at the arch waist of the tunnel.The numerical simulation results show the locations of the plastic penetration zones and thickness of the critical outburst prevention layers under various working conditions.The research results above provide a scientific basis for prediction of water inrush disasters in tunnels and other engineering construction in karst areas.
karst tunneltunnel water inrushcritical outburst prevention layer thicknessnumerical simulation
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