有效应力对煤体渗透率的影响试验研究
Experimental study on effect of effective stress on permeability of coal
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摘要: 为了研究有效应力对渗透率的影响机制，利用自主研发的煤岩瓦斯吸附-解吸-渗流平台，开展了轴压、围压同步加载条件下煤体渗透率测试试验。引入平均有效应力参数表征煤体受载状态，同时为消除试件个体差异的影响，定义了有效应力敏感系数，深入探讨有效应力对煤体渗透率的控制机理与变化规律。结果表明：瓦斯压力保持恒定时，随着有效应力增加煤体渗透率逐渐减小，其变化规律符合负指数关系；随着有效应力的增加敏感系数逐减小，且符合幂函数关系。基于敏感系数构建了煤样渗透率与有效应力的数学模型。Abstract: In order to study the influence mechanism of effective stress on permeability, the coal permeability test experiment under simultaneous loading of axial and confining pressure was carried out using the self-developed coal-rock gas adsorption-desorption-seepage platform. The mean effective stress parameter is introduced to characterize the loaded state of the coal body. At the same time, in order to eliminate the influence of the individual differences of the specimens, the effective stress sensitivity coefficient is defined, and the control mechanism and variation law of the effective stress on the permeability of the coal body are discussed in depth. The results show that when the gas pressure remains constant, the coal permeability decreases gradually with the increase of the effective stress, and its variation law conforms to the negative exponential relationship. With the increase of effective stress, the sensitivity coefficient gradually decreases, and it conforms to the power function relationship. At the same time, a mathematical model of coal sample permeability and effective stress is constructed based on the sensitivity coefficient.
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Keywords:
- permeability /
- synchronous loading /
- effective stress /
- sensitivity coefficient /
- mathematical model
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