Namerical Simulation of Top Coal Movement Laws at Fully Mechanized Mining Face

The top-coal movement laws under different forward distances at 1304 fully-mechanized mining face in Zhaozhuang Mine No.2 Shaft are simulated by FLAC^3D. The results show that there is obvious advancing abutment pressure zone after the coal mining in front of the mining face. With the advancing of mining face, the peak value of advancing abutment pressure is increased and stabled; vertical displacement of the top-coal began to increase sharply when mining face advanced to coal wall front around 10 m.