Strong Mining Pressure Control in a Deep High-Gas Coal Seam with a Hard Roof Using Hydraulic Fracturing Technology

The prevention and control of coupled disasters caused by strong mining pressure and high gas is currently the main challenge during coal seam deep mining in the southeastern mining areas of Shanxi Province. This paper takes the 1310 working face of Hudi Coal Mine as the engineering background, analyzing its on-site strong mining pressure event and triggering factors. A reasonable hydraulic fracturing scheme (including layer selection, drilling parameter design, etc.) is proposed based on theoretical analysis of the principles and advantages of hydraulic fracturing technology. Then, the physical analog modeling (PAM) method was used to study the movement law and fracture development of the overlying strata during coal seam mining after hydraulic fracturing. The weakening effect of mining pressure was analyzed through the evolution law of roof stress. The deformation of the surrounding rock in the roadway, coal drilling cuttings, support working resistance, and roof fracture development of the in situ measurement results show that hydraulic fracturing has a good effect on weakening mining pressure. It has achieved safe and efficient mining of coal seams while providing a reference for coal mines with similar conditions.