With the numerical simulation software UDEC,the abutment pressure,vertical stress and the location of plastic zone in both the hanging wall and the heading wall were simulated and analyzed.The continuity of rock was damaged by normal fault.The initial stress from the fault produced deflection and engendered additional stress in some area.The results prove that low pressure zone and high stress concentration zone appear in heading wall,and the distance between the obvious effects range and the fault plane is...