The impact of underlying coal mining on surrounding rock stress in overlying roadway

In order to grasp the stress state in surrounding rock in suction road 17101(3) of Pansan mine before and after underlying 11-2 coal mining, using the hollow inclusion stress release method, in-situ stress measurement were conducted at 6 points before and after mining underlying coal seam. And the engineering was simulated and calculated by finite difference software FLAC3D. The results show that the maximum principal stress of this aera is 21.62 Mpa, the maximum stress direction close to the horizontal direction, the maximum horizontal principal stress is about 1.42 times the vertical stress, has obvious characteristics of tectonic stress. Through the analysis of measured ground stress during mining underlying seam, it was known that the maximum principal stress decreased by 3% compared with that before mining.