Numerical Simulation of Roof Fracture for Paste Filling Mining Under Pressurized Water

In order to safely mine the coal under pressurized water,roof maintenance is essential,applying the rational mining method is one of the roof maintenance ways.The height of the water-flowing fractured zone is calculated according to the geological conditions of Xiaoma Mine,the mechanical model of the roof is establisheded.The roof destruction during coal mining with caving and paste filling is numerically simulated by FLAC3D,in order to determine the reliability of the paste filling for mining under pressurized water.