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首页> 外文会议>2007采矿科学与安全技术国际学术会议 >Experimental Study on Permeability of Coal Samples under Different Effective Confining Pressure
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Experimental Study on Permeability of Coal Samples under Different Effective Confining Pressure

机译：不同有效围压下煤样品渗透率的试验研究

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摘要

In the course of coal extracting, surrounding rock mass around coal face and roadway was fractured or deformed. The original permeability state of surrounding rock mass was also changed, and the new uneven and anisotropy permeability filed was formed. Researches on permeability characteristics with the compression failure process of coal samples is of very important significance for evaluating hydrogeology condition of roof & floor during the extraction and for controlling of surrounding rock water irruption around mining area. In this paper, the permeability tests of coal samples under different confining pressure are carried out on MTS815.03 electro-hydraulic servo-controlled rock mechanical test system. The results show that the permeability rate curve and the whole stress-strain curve of coal almost have the same development trend. But the permeability rate-strain curve is relatively "hysteretic" which indicates that the close relativity between the evolvement of damage and the development of permeability rate and the permeability developing needs a time course. The permeability of coal presents the tendency of sharply falling on the whole while the effective confining pressure increasing. It shows that the rupture and development of cracks in coal are restricted by the confining pressure.
机译：在采煤过程中，煤层工作面和巷道周围的围岩破裂或变形。围岩的原始渗透率状态也发生了变化，形成了新的不均匀和各向异性的渗透率场。研究煤样压缩破坏过程的渗透性特征，对于评价开采过程中顶，底板的水文地质条件，控制矿区周围的围岩喷水，具有十分重要的意义。本文在MTS815.03电液伺服控制岩石力学测试系统上进行了不同围压条件下煤样的渗透性测试。结果表明，煤的渗透率曲线和整个应力应变曲线几乎都具有相同的发展趋势。但是渗透率-应变曲线是相对“滞后的”，这表明损害的发展与渗透率的发展与渗透率的发展之间的密切相关性需要一个时间过程。煤的渗透率总体上呈现急剧下降的趋势，而有效围压却在增加。结果表明，煤的裂缝的破裂和发展受到围压的限制。

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