基于微震矩张量的矿山围岩破坏机制分析

发布时间：2018-09-06 07:59

【摘要】：微震是矿山岩体损伤的重要信号,并被用于矿山围岩稳定性分析。为应用矩张量理论,研究矿山开采围岩破坏机制,对理论运用中的关键问题提出了解决办法:(1)通过引入适于矿山岩体应力状态的矩张量三分量分解模型,解决了由于矿山应力状态不确定带来的矩张量分解方程组求解的不确定问题;(2)针对Ohstu提出的矩张量岩体破坏模式判据的不足之处进行了讨论和修正,使其适于矿山岩体工程岩体破坏模式分析。利用改进后的矩张量分析方法对冬瓜山铜矿的部分巷道围岩破坏机制进行研究,印证了冬瓜山巷道围岩破坏是一种以剪切破坏为主,多因素综合作用的破坏形式的结论。当巷道穿过不同岩层接触带时,微震事件在接触带附近积聚,表明巷道围岩出现剪切破坏带并形成冒落区;位于单一岩层中的巷道围岩中的微震活动较为分散,破坏原因多为围岩应力集中,破坏形式表现为局部性围岩冒落。
[Abstract]:Micro-earthquake is an important signal of rock mass damage and is used to analyze the stability of surrounding rock. In order to apply the moment Zhang Liang theory to study the failure mechanism of the surrounding rock in mining, the solutions to the key problems in the application of the theory are put forward: (1) by introducing the three component decomposition model of the moment Zhang Liang, which is suitable for the stress state of the rock mass in the mine, This paper solves the uncertain problem of solving the decomposition equations of moment Zhang Liang caused by the uncertainty of mine stress state. (2) aiming at the deficiency of the criterion of moment Zhang Liang rock mass failure mode proposed by Ohstu, the paper discusses and corrects it. It is suitable for rock mass failure mode analysis in mine rock mass engineering. The failure mechanism of part of roadway surrounding rock in Dongguashan Copper Mine is studied by using the improved moment Zhang Liang analysis method. The conclusion that the surrounding rock failure of Dongguashan roadway is mainly shear failure and multi-factor comprehensive action is confirmed. When the roadway passes through different strata contact zone, the microseismic event accumulates near the contact zone, which indicates that the surrounding rock of roadway appears shear failure zone and forms caving zone, and the microseismic activity in the surrounding rock of roadway located in a single rock layer is scattered. The failure reason is mostly the stress concentration of surrounding rock, and the failure form is local rock caving.
【作者单位】：中南大学资源与安全工程学院;
【基金】：国家自然科学基金资助项目(No.51474250)~~
【分类号】：TD325

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