Numerical analysis of breaking depth of coal floor caused by mining pressure

With coal resources are exploited and deepened, mining above aquifer has already became a coal mining method generally employed in deep mine of China. So the problem of coal floor inrush water becomes more serious. Water inrush coefficient theory, as evaluating the fatalness of coal floor inrush water, is a primary basis of mining above aquifer. Making sure that strata pressure causes the destructive deepness of coal floor,it is important to obtain reliable water inrush coefficient value. According to exploiting practice of Chengjiao coal mine,this paper utilized F-RFPA2D software to carry out the analysis of numerical simulation about destructive deepness of coal floor, dynamically reproducing the destructive course of coal floor, and obtaining the destructive depth to coal floor during the different course of strata pressure.