Overburden Movement Laws of Mechanized Caving Face in Changzhi Mining Area

For the movement laws of overburden, the maximum subsidence value of measuring points of Z29^#, Z30^#, Z32^# in Gaohe Mine was analyzed. Through analyzing initial data, the maximum sinking speed of surface, the initial settlement period, the active period, a period of recession is directly related with mining depth, face width, advancing speed and so on. And using FLAC^3D, the different widths of 155 m and 255 m are analyzed. The overburden stress distribution and displacement of different widths of face is simulated. The movement of overburden is because of rock stress redistribution caused by mining and the destruction, instability and deformation in the stress redistribution process of rock joints, bedding, weak structural plane.