“三软”煤层顶底板注浆加固技术研究

Study on grouting reinforcement technology of roof and floor of "Three soft" coal seam

为解决底抽巷施工瓦斯治理钻孔后,对煤体进行水力割缝与冲孔造成煤岩体结构破坏问题,同时提高巷道围岩抗压强度,提出利用穿层钻孔和顺层钻孔向煤岩体内进行注浆充填裂隙加固孔洞的综合措施,并采取注浆锚索补强顶板支护的方案,实现巷道变形移近量在200 mm以内的效果,提升围岩支护强度。

In order to solve the problem that after drilling for gas control in bottom pumping roadway construction,hydraulic slotting and punching of coal body will cause structural damage of coal and rock mass and improve the compressive strength of roadway surrounding rock,comprehensive measures of grouting filling cracks in coal and rock mass and strengthening holes are put forward by using through layer drilling and along layer drilling,and the scheme of grouting anchor cable reinforcement roof support is adopted.The effect of roadway deformation within 200 mm is achieved,and the strength of surrounding rock support is improved.