Stability Analysis and Control Technology of Surrounding Rock on Large Section Coal Roadway Chamber Group

In order to study the influence mechanism of roadway height and chamber distance on surrounding rock stability of roadway and chamber group, based on the study of the chamber group in the northern wing transportation roadway of a mine, the mechanism of surrounding rock stress disturbance was analyzed, differentiated support program of reinforcement of roof support at intersections when height of main lane and branch lane is same, and strengthening roof support of branch roadways when height is inconsistent was proposed. It is determined that the minimum chamber spacing is 6 m. Field measurements show that the surrounding rock has no fracture development when the depth of the surrounding rock exceeds 2 m, and the supporting effect is ideal.