Research On The Surrounding Rock Control Technology Of Thick And Hard Roof Roadway Under The Influence Of Mining

Under the conditions of thick and hard roof, after mining the coal face in the rear end face of the coal face formed a large area coalface overhang, it is not easy to collapse in a short time, naturally, exposed roof Gob area will be gradually increased, causing the coal face support pressure increased, leading to the coal face of the adjacent pillar of the degree of stress concentration is relatively high, in that pillar, roadway deformation is serious,and difficult to maintain.15 # coal seam of Gushuyuan mine, seam thickness is 2m, the immediate roof is limestone, the thickness is 10.13 m, hard and complete. Lateral support pressure will affect the reserved roadway, when the coal face mining. They slabbing, floor heave serious. In this regard, this paper analyzes its roof and floor rock mechanics parameters, 15 # coal seam studied the coalface of15 # seams. When it in the process of mining and its impact on the stress around the stope. I calculate this overburden caving with height of15 # coal seam, in this paper, the numerical simulation software FLAC3 D is used to analyze the distribution of abutment pressure in the coal face. Concluded that reserved roadway suffered excessive pressure lateral support is the main reason for the deformation of surrounding rock. Proposed shear the the top end face coalface method to reduce the length of the roof overhang, reducing the lateral bearing pressure. Using numerical simulation method to simulate the coal face,which set two programs to cut in the top roof or not, and in the process of coal mining state rock face ends of the structure, the lateral displacement of the bearing pressure and the roadway distribution, in the the process of mining coal face, the ends coal face rock structure state, lateral support pressure,distribution of roadway displacement and roadway deformation under different support parameters.Decided to use relief and reinforcement of surrounding rock control technology together,it also design parameters of the pre-split blasting,Conduct field trials in Gushuyuan Mine of 152309 coal face and 1523103 roadway, Get much better technical and economic benefits.