某矿坚硬顶板综采工作面端头弱化处理技术

End Weakening Treatment Technology of Hard Roof Fully Mechanized Mining Face in a Mine

综采工作面端头悬空面积大,不仅会导致矿压显现异常,工作面漏风严重,而且增加采空区有害气体外溢量,给采面安全带来隐患。以某矿综采工作面坚硬顶板端头处理为工程背景,针对端头顶板悬空面积大、邻近采面回采巷道受采动压力影响显著等问题,基于顶板压裂弱化及水力压裂切顶理念,结合工作面顶板岩层情况,给出水力压裂钻孔布置方案。工程应用表明,综采工作面在水力压裂区域内回采时,端头顶板可随着采面回采及时垮落,同时邻近巷道基本不受采面回采影响,端头顶板弱化技术取得较好效果。

The large arearoof hanging at the end of the fully mechanized mining face will not only lead to abnormal mine pressure and serious air leakage in the working face,but also increase the leakage of harm⁃ful gases in the goaf,which will bring hidden dangers to the safety of the mining face.Taking the treatment of hard roof end of fully mechanized mining face in a mine as the engineering background,aiming at the prob⁃lems of large hanging area of roof plate at the end and significant influence of mining pressure on adjacent mining face mining roadway,based on the concept of roof fracturing weakening and hydraulic fracturing roof cutting,the layout scheme of hydraulic fracturing boreholes in combination with the roof strata of working face is put forward,The engineering application shows that when the fully mechanized mining face is mined in the hydraulic fracturing area,the end top plate can collapse in time with the mining face mining,and the adjacent roadway is basically not affected by the mining face mining,the end weakening technology can achieve better results.