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Experimental study on the failure law of water-bearing coal and the evolution of permeability under plastic flow
Environmental Earth Sciences ( IF 2.8 ) Pub Date : 2020-07-03 , DOI: 10.1007/s12665-020-09095-z
Jingna Guo , Jiangfeng Liu , Qiang Li , Zhanqing Chen

During coal excavation, coal pillars can undergo shear failure due to repeated loading and unloading of mining-induced stress, and this failure may be followed by plastic flow. Change in the permeability of the coal pillar under plastic flow is closely related to the loading path. In this study, the development of the permeability of a coal seam under plastic flow was investigated by conducting permeability testing on a shear-yielded coal sample as it was subjected to cyclic loading and unloading. The results show that the permeability is inversely related to the volumetric strain; that is, the permeability decreases as the volume strain increases and vice versa. However, the permeability at a given strain value is greater during loading than that during unloading. The curve of strain and permeability will form an approximately elliptical hysteresis, and the permeability is a multi-valued function of volumetric strain. As the confining pressure is increased, crack opening decreases, and crack penetration moves from the ends toward the middle of the sample.

中文翻译:

塑性流下含水煤破坏规律及渗透性演化的试验研究

在采煤过程中,由于反复加载和卸载采矿引起的应力,煤柱可能会发生剪切破坏,而这种破坏可能会伴随塑性流动。塑性流作用下煤柱渗透率的变化与加载路径密切相关。在这项研究中,通过对剪切屈服的煤样品进行循环加载和卸载进行渗透性测试,研究了塑性流作用下煤层渗透性的发展。结果表明,渗透率与体积应变成反比。也就是说,渗透率随着体积应变的增加而降低,反之亦然。但是,给定应变值下的渗透率在加载过程中要比卸载过程中的渗透率大。应变和渗透率的曲线将形成近似椭圆的磁滞,而渗透率是体积应变的多值函数。随着围压的增加,裂纹的开度减小,裂纹的渗透从样品的两端向中间移动。
更新日期:2020-07-03
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