动静载荷下含软弱夹层巷道围岩稳定性分析
Stability analysis of roadway surrounding rock with weak interlayer under dynamic and static loads
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摘要: 为探究动静载荷下含软弱夹层巷道围岩变形破坏规律，以龙凤煤矿深部运输巷道为研究对象，运用FLAC3D数值模拟软件对动静载荷下含软弱夹层巷道围岩力学变形特征进行了研究，并结合现场巷道实际情况提出支护优化方案。结果表明：动载荷作用对巷道两帮的影响大于巷道顶底板；动载荷作用下巷道围岩变形破坏范围相较于静载荷更加充分，软弱夹层与相邻岩层更易发生离层，且在巷道顶板形成有冒落风险的危险区域；新采用的锚杆锚索联合支护措施下围岩稳定性明显提高，保证了矿井安全生产。Abstract: To study the deformation and failure law of roadway surrounding rock with weak interlayer under dynamic and static loads, taking the deep transportation roadway of Longfeng Coal Mine as the research object, the mechanical deformation characteristics of roadway surrounding rock with weak interlayer under dynamic and static loads is analyzed by using FLAC3D numerical simulation software, and the support optimization scheme is proposed combined with the actual roadway situation on site. The results show that the influence of dynamic load on roadway both sides is greater than that of roadway roof and floor. Compared with the static load, the deformation and failure range of roadway surrounding rock under dynamic load is more sufficient, the weak interlayer is easier to separate from the adjacent rock stratum and a dangerous area with caving risk is formed in the roadway roof. The stability of surrounding rock is obviously improved under the new support measures, which ensures the safe production of the mine.
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