In the procerss of coal mined under the water bodies,because the stress around the strata will be redistributed,so the deformation,displacement and failure will occur.The failure's entering into the water will cause the water accident,which endangers the safe operation of coal mines.With rock failure process analysis RFPA2D system,the numerical simulation reproduced the whole progressive process of the overlying strata caused by mining excavation.By analysis of the analog result,the distributional character...