Permeability analysis of gassy raw coal under three stresses
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摘要: 利用自主研制的含瓦斯煤热流固耦合三轴伺服渗流装置，对杉木树煤矿原煤试样进行了不同轴压、围压、瓦斯压力3种应力因素条件下的室内渗流实验，结果表明：当恒定瓦斯压力与围压不变时，煤样渗透率随轴压的增加而呈非线性降低，且围压越高煤样渗透率越小；当恒定瓦斯压力与轴压不变时，煤样渗透率随围压的增加而呈非线性降低，且轴压越大煤样渗透率越小；当恒定轴压与围压不变时，煤样渗透率随瓦斯压力的增加而呈非线性增加。3种应力因素对煤样渗透率的敏感度由大至小依次为：瓦斯压力、围压、轴压。3种应力因素与煤样渗透率的单因素拟合结果显示，3种应力因素与煤样渗透率均呈指数函数关系。Abstract: By using the independently developed thermal fluid-solid coupled three-axis servo seepage device of gassy coal, the indoor seepage experiment under three stress factors of different axial pressure, confining pressure and gas pressure was carried out on the raw coal sample of Shanmushu Coal Mine. The results show that: when the constant gas pressure and confining pressure are constant, the coal sample permeability decreases nonlinearly with the increase of axial pressure, and the higher the confining pressure, the smaller the coal sample permeability; when the constant gas pressure and the axial pressure are constant, the permeability of the coal sample decreases nonlinearly with the increase of the confining pressure, and the larger the axial pressure, the smaller the permeability of the coal sample; when the constant axial pressure and confining pressure are constant, the coal sample permeability increases nonlinearly with increasing gas pressure. The sensitivity from the largest to the smallest of the three stress factors to the permeability of the coal sample is in the order of gas pressure, confining pressure and axial pressure.The single factor fitting results of three stress factors and the coal sample permeability show that the three stress factors are exponentially related to the coal sample permeability.
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Keywords:
- gassy raw coal /
- permeability /
- stress factor /
- axial compression /
- confining pressure /
- gas pressure /
- sensitivity
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