大断面破碎泥岩巷道让抗封闭综合支护技术

Yield-resistance Stress Closed Support Technology of Fractured Mudstone Roadway with Large Section

以俄霍布拉克矿2#煤主运大巷为工程背景,通过持续现场监测与室内试验,总结探讨了破碎泥岩巷道围岩变形特征及破坏机理;在此基础上,提出了"初次让压、二次封闭、关键强化"的让抗封闭综合支护技术方案,通过数值分析研究了原支护措施与让抗封闭方案下的围岩位移场及应力场分布特性。结果表明:采用让抗封闭的主被动结合支护方案,能够有效控制顶沉、底臌和两墙收敛问题,同时改善围岩与支护体系的受力状态;现场监测结果与数值分析结论相一致,证明了该支护技术具有良好的变形控制效果。

Taking the main haulage roadway of Ehuobulake No.2 Mine as engineering background, deformation characteristics and failure mechanism were summarized and analyzed with continuous field mine pressure monitoring and laboratory experiment. Based on this, a joint control scheme of yield-resistance stress supporting that included＂first pressure yielding, secondary sealing, key reinforcement＂is proposed, and the distribution laws of displacement, stress field and plastic zones of roadway surrounding rock using this joint control scheme or not were analyzed by numerical simulation. The results show that the joint control scheme can not only control floor heave effectively, but also decrease the roof subsidence deformation and roadway walls convergence. The field monitoring data are consistent with the simulation results, which proves that this scheme get good control effect.