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Numerical analysis of the time-dependent behavior of immediate roof in a hypothetical one-entry mine

机译：假设单入矿井中直接顶板时变行为的数值分析

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This paper presents a rock mechanics investigation of the time-dependent behavior of the rock immediately surrounding the excavation in a hypothetical one-entry coal mine based on the geology of the Illinois coalfields. Research in the area of time-dependency is almost nonexistent and, therefore, this research was performed to make inroads into this neglected research area. Numerical analysis of a typical one-entry coal mine in an Illinois basin was performed using the commercial finite difference program FLAC~(3D). The immediate roof of the coal entry was assumed to be a shale formation. Shale in other formations has shown a tendency to creep with time. Therefore, in this study the authors modeled the shale in the roof using time-dependent characteristics. The input properties were taken from laboratory creep tests performed on shale. Model runs were performed at different stages, mimicking the progressive excavation of the entry. The model results showed that stresses in the roof attained the limit of yielding. Using Mohr-Coulomb failure criteria, potential zones of failure were also predicted. The results showed that the current computational capacities are sufficient to explore this previously uncharted territory of ground control.
机译：本文根据伊利诺伊州煤田的地质情况，对一个假想的单入口煤矿中随即开挖的岩石随时间变化的行为进行了岩石力学研究。几乎没有时间依赖性方面的研究，因此，进行这项研究是为了侵入这个被忽视的研究领域。使用商业有限差分程序FLAC〜（3D）对伊利诺伊盆地典型的一入口煤矿进行了数值分析。煤入口的直接顶部被认为是页岩地层。其他地层中的页岩显示出随时间蠕变的趋势。因此，在这项研究中，作者使用时变特征对屋顶的页岩进行了建模。输入特性取自在页岩上进行的实验室蠕变测试。模型运行在不同阶段进行，模仿了入口的逐步挖掘。模型结果表明，屋顶的应力达到了屈服极限。使用Mohr-Coulomb破坏准则，还可以预测潜在的破坏区域。结果表明，当前的计算能力足以探索以前未知的地面控制领域。

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