文章以小保当煤矿 112204 工作面开采为工程背景,采用理论分析、数值模拟、现场施工和电磁辐射监测的方法对其沿空侧的回风平巷超前段围岩稳定性进行研究分析,结果表明:112204 工作面超前支承应力与邻近 112203 采空区侧向支承应力叠加影响,将导致支承应力叠加区内煤岩体极易发生失稳破坏;适当地增加支承应力叠加区内煤岩体的剪切破断角值和侧向围压值能够有效提升支承应力叠加区内煤岩体失稳破坏时所需的支承应力临界值;实施优化支护和注浆措施后,实体煤帮内电磁辐射均值降幅达64.6%,此时煤岩体失稳破坏程度大幅度改善,围岩处于较好的控制状态,能够很好地服务于 112204 工作面回采作业.
This article takes the mining of the 112204 working face in Xiaobaodang Coal Mine as the engineering background,and uses theoretical analysis,numerical simulation,on-site construction,and electromagnetic radiation monitoring methods to study and analyze the stability of the surrounding rock in the advance section of the return air roadway along the goaf side.The results show that the super-position effect of the advance support stress of the 112204 working face and the lateral support stress of the adjacent 112203 goaf will easily lead to instability and failure of the coal and rock mass in the support stress superposition area;properly increasing the shear frac-ture angle and lateral confining pressure of the coal and rock mass in the support stress superposition area can effectively enhance the critical value of the support stress required for the instability and failure of the coal and rock mass in the support stress superposition ar-ea;after implementing optimized support and grouting measures,the average decrease in electromagnetic radiation inside the solid coal slope reached 64.6%.At this time,the degree of instability and damage of the coal and rock mass was greatly improved,and the sur-rounding rock was in a good control state,which can effectively serve the mining operation period of the 112204 working face.