Solid-liquid coupling study on water inrush through faults in coal mining above confined aquifer

The solid-fluid coupling mathematical model for coal mining above confined aquifer was established after theoretical analysis.Based on this,the finite element program was developed.The working face stress distribution and the water inrush mechanism were researched systematically using numerical simulation method.Relation between different conditions of fault dip angle,fault thickness,fault throw and water-inrush was obtained.The fitted formulas between critical width of fault waterproof pillar and major factors in normal fault and reverse fault were established by using ternary linear regression method,and the water inrush criterion was given.