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Numerical analysis of fault-slip behaviour in longwall mining using linear slip weakening law

机译：利用线性滑动弱化法对长壁采矿故障滑移行为的数值分析

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Coal burst induced by fault-slip in longwall mining can adversely influence underground mining activities. This paper analyses the source mechanisms of fault-slip behaviour using a numerical fast Lagrangian analysis of continua in three dimensions (FLAC(3D)) model. The fault was simulated by the build in zero-thickness interface elements. The post failure process of fault-slip was studied using the linear slip weakening law which was implemented in a user-defined FISH program. The numerical results showed that the fault-slip presented significantly different trends at different positions along the fault. Seismic events mainly occurred at the fault area where the normal stresses reduced drastically. Few seismic events occurred when the distance between the longwall face and the fault was less than 20 m. For the parameters of the linear slip weakening law, the influence of the dynamic friction and the critical slip distance were analysed. These two parameters have significant impact on the occurrence of seismic events and the source parameters of fault-slip. The parametric study showed that fault-slip with around 0.1 m of critical slip distance was able to release larger seismic energy than fault-slip with both less and greater than 0.1 m of critical slip distance. The outcomes of this paper help to better understand the seismic fault-slip process in longwall mining and the influence of the critical parameters of the linear slip weakening law on seismic fault-slip behaviour.
机译：Longwall Mining的故障滑动引起的煤突发可能会对地下采矿活动产生不利影响。本文采用三维连续型的数值快速拉格朗日分析分析了故障滑动行为的源机制（FLAC（3D））模型。故障由零厚度接口元素中的构建模拟。使用线性滑动弱化定律研究了故障滑动的故障过程，该方法在用户定义的鱼类程序中实施。数值结果表明，断层滑移沿着故障呈现出不同位置的显着不同的趋势。地震事件主要发生在断层区域，其中正常压力急剧减少。当长壁面和故障之间的距离小于20米时，发生了很少的地震事件。对于线性滑移弱化法的参数，分析了动态摩擦的影响和临界滑移距离。这两个参数对地震事件发生的显着影响和故障滑动的源参数。参数研究表明，具有约0.1米的临界滑动距离的容错率能够释放比临界滑动距离的少于且大于0.1μm的故障滑动较大的地震能量。本文的结果有助于更好地了解长壁挖掘中的地震断裂过程，以及线性滑动弱化法对地震断裂行为的关键参数的影响。

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