【摘要】 针对锦程煤矿坚硬顶板工作面开采中顶板难以垮落导致的大面积悬顶、周边煤体及巷道围岩高应力大变形问题，以10-205厚硬顶板工作面为工程背景，通过理论分析与数值模拟，研究爆破切顶卸压对采区巷道围岩变形的控制技术，明确了合理的切顶关键参数，并开展现场工程应用。研究结果表明：爆破切顶改变了顶板断裂位置，垮落岩块填充采空区并支撑上覆岩层结构，避免了顶板旋转下沉对采区轨道巷的强烈扰动。对于10-205工作面，最优切顶方式为深浅孔联合切顶，其中浅孔切顶高度14.7 m,深孔切顶高度22.6 m。与浅孔爆破切顶相比，该工艺使采区轨道巷顶底板相对移近量、两帮相对移近量分别降低了63%和56%,有效控制了巷道变形，切顶卸压取得了良好的护巷效果。更多还原

【Abstract】 In response to the large area suspended roof caused by the difficult collapse of the hard roof mining face in Jincheng Coal Mine, which leads to high stress and large deformation of the surrounding coal and roadway surrounding rock, we took the 10-205 thick hard roof working face as the engineering background, to study the mining roadway surrounding rock control technology with blasting roof cutting and pressure relief through theoretical analysis and numerical simulation. Reasonable key parameters of the roof cutting were analyzed and applied in on-site engineering. The research results indicate that, the blasting roof cutting changes the fracture position of the roof, the collapsed rock blocks fill goaf and support the overlying rock structure, thus eliminate the strong disturbance and harm to the district track roadway caused by the rotation and sinking of the roof. For the 10-205 working face, the reasonable cutting method is deep-shallow holes blasting, with a shallow hole cutting height of 14.7 m and a deep hole cutting height of 22.6 m; Compared with shallow hole blasting for roof cutting, the deformation of the district track roadway was better controlled using the deep-shallow holes blasting, bringing down the roof-to-floor convergence and side-to-side convergence by 63% and 56%, respectively. Favorable roadway protection effect was achieved with the proposed roof cutting and pressure relief method.更多还原