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针对某矿厚松软破碎泥岩顶板运输巷变形大、支护构件大面积失效、持续变形剧烈的工程难题,通过对巷道变形破坏特征及变形力学机制进行分析,确定了巷道围岩类型为膨胀-裂隙节理化软岩;在原支护方案的基础上,提出了长锚索+锚网喷(方案1)和长短锚索多级控顶+锚网喷(方案2)2种优化方案,并采用FLAC3D软件数值模拟了2种优化方案的支护效果;工程实践表明:在采用长短锚索多级控顶+锚网喷耦合支护方案后,顶板最大下沉量为96.87 mm,两帮移近量为111.1 mm,底鼓量为112.7 mm,分别为原支护方案的22.4%、17.63%、32.18%,改善了巷道围岩受力状态,有效控制了巷道有害变形。
Aiming at the problem of large deformation and large-scale failure of the transportation lane with thick soft and broken shale in a mine, and the continual deformation of the supporting members, the engineering problems of the deformation and damage mechanics of the roadway are analyzed. Based on the original support scheme, two optimization schemes of long anchor cable + anchor net spray (Scheme 1) and long and short anchor cable multi-stage control + anchor net spray (Scheme 2) are proposed. The FLAC3D The numerical simulation of the two kinds of optimization scheme support effect; engineering practice shows that: in the use of long and short anchor multi-stage control + anchor net spray coupling support program, the maximum roof subsidence was 96.87 mm, Is 111.1 mm and the amount of bottom drum is 112.7 mm, which is respectively 22.4%, 17.63% and 32.18% of the original support scheme, which improves the stress state of the surrounding rock of the roadway and effectively controls the harmful deformation of the roadway.