随机节理岩体巷道再生顶板失稳机理与控制研究

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。

Study of instability mechanism and control of roadway regenerated roof in random joint rock

To study the instability mechanism and control method of roadway regenerated roof in ran-dom joint rock, a random joint simulation program has been written to build a random joint numerical roadway model through FISH language embedded in UDEC software, combined with the Monte-Carlo simulation method and based on statistical result of joint parameters in an excavation roadway of Beizao coal mine. The stability failure process and support form of roadway regenerated roof has been simu-lated in the model, and the numerical simulation result has been tested by engineering application. The research has shown that some small rock blocks in the support roof are easy to slide and to be caved, then key rock block slides down along the joint interface, and when one end of key rock block is sepa-rated from the roadway wall, the whole roof loses its stability and begins to collapse. The proper road-way support form under regenerated roof is the combination of cable anchor and shield support, which can control the roof deformation and prevent the caving of broken small rock blocks.