Research on In-situ Stress Measurement and Roadway Support Design in Coal Seam

Based on the existing situation of No.3 Coal Seam in Hengxing coal mine, the in-situ stress measurement was carried out at the two measuring points of the main inclined shaft bottom yard and the track roadway by using the core stress relief method, and the in-situ stress distribution characteristics of the measuring point area were obtained. Based on the measurement results, the numerical simulation software was used to simulate the support design of No. 3 coal seam roadway, and the deformation of roadway surrounding rock under different support methods and parameters was analyzed. The results show that the in-situ stress field in the second mining area of No.3 Coal Seam in Hengxing coal mine is mainly horizontal stress, the average maximum horizontal principal stress is 3.88MPa, and the average azimuth is 129°. The roadway support simulation shows that the bolt+anchor cable support method can effectively control the deformation of surrounding rock, and the displacement of roof and floor and two sides can be controlled within 100mm, meeting the production requirements. This study provides an important reference for the safe mining of No.3 coal seam in Hengxing coal mine.