Research on the Damage Law and Prevention Measures of the Substrate under the Action of Water and Rock

The potential of sudden water accidents induced by damage to the bottom slab that forms a channel due action karst calls for research on law coal seam floors under coupling effect mining and water. In this study, situation floor rock was analyzed based theory mechanics fracture mechanics, combined with actual geological conditions floor. water-rock investigated using theoretical analysis mechanical tests. Results indicate strength decreased significantly when pore coupled rock. A three-dimensional numerical model established FLAC3D software simulate working face different pressures. By analyzing stress change, pressure plastic zone slab, it discovered continues increase is greater than 3 MPa. impact caused 6 MPa occurs gradually. Analysis measures prevent control indicates grouting reinforcement can effectively problem.