Exploration and Comprehensive Treatment Technology of Overburden Fracture in UnderlyingGoaf of Reservoir

Taking the grouting filling treatment project in the goaf of 8712 working face of Huoshizui Coal Mine as the background, based on the theory of mining subsidence and the method of combining borehole wave velocity test and pressure water test, the characteristics of fracture development in overburden strata after fully mechanized caving are expounded. The results show that during the overall movement of the overlying strata after fully mechanized caving mining, the integrity of the rock mass was damaged to varying degrees, and a tensile gap with a horizontal width of about 60 m was formed at the edge of the goaf. The comprehensive treatment technology of “seepage-proofing at the bottom of the reservoir, full-clay filling and grouting in the goaf, and monitoring the movement and deformation of the affected area” has achieved good governance effects.