定向水力致裂技术在坚硬顶板弱化控制中的应用

Application of Directional Hydraulic Cracking Technology in Weakening Control of Hard Roof

同煤集团马脊梁矿8111工作面的临空顺槽5111巷由于受本工作面超前支承应力和采空区残余支承应力作用,出现了较严重的下沉、底鼓、帮鼓等现象。为了减弱5111巷顶板支承应力,决定采用定向水力致裂技术方案转移部分上覆岩层压力。自5111巷1890 m处至90 m处,共施工96个钻孔,成功预裂93个。方案实施后,围岩控制效果得到改善。

Due to the effect of advanced supporting stress and residual supporting stress in goaf,5111 roadway of No.8111 working face in Majiliang Mine of Datong Coal Mine Group has serious subsidence,floor heave and side heave.In order to reduce the roof supporting stress of 5111 roadway,the directional hydraulic fracturing technology is adopted to transfer the pressure of overlying strata.From 1890 m to 90 m of lane 5111,96 boreholes were constructed,and 93 holes were pre cracked successfully.After the implementation of the scheme,the surrounding rock control effect has been improved.