Research on “Pressure Relief and Coupling” Support Technology of High Stress Dynamic Pressure Coal Roadway

Based on the engineering problems of large deformation, wide fracture range and support components failure in the 7609 transportation roadway of Wuyang Mine, the fracture range of roof was determined by roof hole peep results. In the original supporting scheme, the change laws of plastic zone range and displacement of surrounding rock under different dynamic pressure coefficients are analyzed by FLAC^3D software. The failure mechanism of the roadway instability is summarized, and the critical dynamic pressure coefficient of the plastic deformation of roadway surrounding rock is 2.0. The “pressure relief-coupling” support technology was proposed and applied to the industrial test. The industrial test shows that the maximum subsidence, the floor heave and the maximum displacement of the two-side of the roadway is 30 mm, 13.7 mm and 25.6 mm respectively after adopting the support technology; the maximum separation layer in the anchorage zone is 3.5 mm and 20.6 mm respectively, which basically controls the harmful deformation of surrounding rock.