煤矿爆破切顶卸压沿空留巷开采技术应用OA

Taking the mining face of a coal mine as an example,this paper probes into the application strategy of blasting roof cutting and pressure relief and retaining roadway along goaf.The roof pre-splitting is carried out by using two-way concentrated blasting technology.Through the reasonable design of key parameters such as roof cutting height,top cutting angle and hole spacing,the blasting pre-splitting effect is improved and the stability of roadway surrounding rock is ensured.After the completion of blasting,coal seam mining is carried out,anchor cable support and U-shaped steel support are used to improve the support effect in the roadway,and I-beam and U-shaped steel support are used to prevent the lateral impact of gangue on the surrounding rock,which creates a favorable environment for coal mine safety operation.