Stress analysis and seismic performance testing of surrounding rock in coal mine roadway

This study focuses on the stability control of surrounding rock in coal mine roadway. The finite difference method combined with FLAC3D software was adopted to establish numerical simulation model of the roadway roof, so as to analyze the influence of roof cutting height and roof cutting angle on the surrounding rock stress field. Through field tests, the bidirectional blasting excavation technology with energy-gathering pipes was used, combined with resistance-controllable support equipment. Differentiated monitoring point scheme was designed to monitor the changes in anchor cable tension and roof subsidence. The research results show that when the roof cutting height increases from 3 m to 6 m, the maximum stress of the roadway decreases by approximately 17 %, and the high-stress area shifts to the deep stable rock formation. When the roof cutting angle is adjusted from 0° to 10°, the maximum stress decreases by about 19.4 %, and the area of the high-stress zone is reduced to 11 % of the total cross-sectional area. When the distance behind the working face exceeds 100 m, the roof reaches a stable state under the action of support.