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为了使古书院矿15#煤综采工作面坚硬顶板能随工作面推进而及时垮落,减轻坚硬顶板垮落时对工作面的冲击和矿压显现,防止坚硬顶板突然垮落时工作面瓦斯骤然剧增所导致的瓦斯问题,采用了超前深孔预裂爆破的方式对15#煤综采工作面坚硬顶板进行弱化处理。通过对坚硬顶板的弱化处理,减少了初次来压和周期来压的步距,使采空区积聚的瓦斯均衡涌出,从而有效控制了大面积悬顶时顶板瞬间垮落所造成的工作面采空区瓦斯骤然涌出,保证了综采工作面的安全生产。
In order to make the hard roof of 15 # fully mechanized coal mining face of Gushuyuan Mine can collapse in time with the advancement of working face and reduce the impact on the working face and the rock pressure when the hard roof collapsed to prevent the sudden collapse of the hard roof, Sudden surge in the gas caused by the problem, the use of advanced deep-hole pre-split blasting method of 15 # coal mining face hardening roof weakened. By weakening the hard roof, the initial pressure and periodic pressure steps are reduced, so that the gas accumulated in the goaf can be evenly ejected, thus effectively controlling the instantaneous collapse of the roof caused by the large-area suspended roof Gob gas suddenly gushed out to ensure the safety of fully mechanized mining face.