High production and high efficiency is a important indicator for evaluating the comprehensive benefit of coal mine.Affected by the failure of coal seam mining,the stress load tends to move toward or concentrate on certain point of roadway side or roof and floor,causing the deformation of roadway or collapse.In order to eliminate this problem,the author puts forward the technique of advanced blasting top-cutting pressure relief,designs the resealable parameters of deep-hole prefracture blasting processes and blasting hole,and carries out directional prefracture blasting for key strata.The blasting top-cutting implementation shows that the process can effectively cut the path of stress load and control the deformation of roadway surrounding rock.
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