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为研究随机节理岩体巷道再生顶板失稳机理及控制方法,基于龙口某矿油页岩上分层巷道节理参数统计结果,结合蒙特卡罗模拟方法,采用UDEC软件内置FISH语言编写了随机节理模拟程序,建立了随机节理岩体巷道数值模型,对随机节理岩体巷道再生顶板的失稳破坏过程及支护方式进行了模拟,并通过工程应用对数值模拟进行了验证。结果表明:再生顶板巷道开挖后预留护顶中小的易冒块体首先沿节理面滑落,之后关键块体在上部破碎岩块压力作用下沿节理面滑动下沉,当关键块体一端滑离巷帮节理面时,关键块体失稳,发生冒顶;再生顶板下预留护顶掘进巷道合理支护方式为锚索-架棚联合支护,可有效控制巷道顶板变形并防止顶板破碎块体冒落。
In order to study the instability mechanism and control method of alluvial roof of random joint rock mass, based on the statistical results of joint parameters of stratified roadway in a mineral oil shale of Longkou and Monte-Carlo simulation method, a stochastic joint simulation Program, a numerical model of rock mass tunnel with random joints is established. The failure process and supporting method of rock mass tunnel roof with random joints are simulated. The numerical simulation is verified by engineering application. The results show that the middle and small easy-to-take blocks that reserve the retaining roof after the excavation of the regenerated roof tunnel firstly slide along the joint surface, and then the key blocks slide along the joint surface under the pressure of the upper crushed rock block. When the key block When the alley faces the alluvial plane, the key block is unstable and the roof falls. The reasonable supporting method of retaining tunnel under the regenerated roof is the combined support of the anchor cable and the shelter, which can effectively control the roof deformation and prevent the roof from being broken Body fall.