Relationship between advancing abutment pressure and deformation of surrounding rock in a roadway: a case study in Helin coal mine in China

The determination of propulsive abutment pressure and deformation characteristics roadway surrounding rock mass in top-coal caving mining is great significance for further research on stress, support equipment selection. This paper adopts the method combining theoretical analysis field test, taking Helin coal mine j7401 working face as object. relationship between revealed by monitoring stress transportation ventilation observing roadway. main conclusions are follows: when distance borehole about 65 m, begins to exceed original peak 15–22 m front face, ranging from 33 39 MPa, which 3.2–3.8 times stress. intersection curve located at 8.1 boundary rapid stage deceleration 8.9 ahead two stages 0.8 position 19.8 m. decelerative stationary small 20.1 0.3 fracture zone limit equilibrium curve. plastic constituted damage zone, elastic pressure. above study results provide a basis efficient mining.