To research the percolation rate of gas-filled coal based on true triaxial condition, this paper uses the three-phase coupling true triaxial servo test device to carry out the seepage test of coal, and the percolation rate of coal under different conditions of three factors such as gas pressure was measured by Darcy’s law, and the variation of percolation rate of coal was studied based on the comprehensive consideration of thermal elastic swelling deformation, expansion deformation of adsorbed gas, and compression deformation of interstitial pressure. The results are as follows: (1) When the main stress and temperature maintain unchanged, the percolation rate presents the trend which first decreases and then becomes gentle with the gas pressure; when the gas pressure and main stress maintain unchanged, the percolation rate increases with the decrease of temperature; when the pressure and temperature maintain unchanged, the changes of percolation rate present a shape of “V” with the main stress. (2) The strain curve of gas-filled coal decreases at first and then increases; that is, the percolation rate decreases gradually when the strain increases at the compression phase and elastic phase, while the percolation rate increases with the increase of strain at the yield phase and failure phase. (3) In the process of increasing volume stress, the percolation rate decreases gradually in the pore compaction stage, the percolation rate increases gradually from crack propagation to peak failure stage, and then, the percolation rate increases significantly after the peak damage. According to the test results, the percolation rate and volume strain show an inverse proportion.

中文翻译：

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基于真三轴条件的含气煤体渗流率特性试验研究

为研究基于真三轴条件下充填煤的渗流率，本文采用三相耦合真三轴伺服试验装置对煤进行渗流试验，分析了不同条件下煤的三因素渗流率采用达西定律测量瓦斯压力等，综合考虑热弹性膨胀变形、吸附瓦斯膨胀变形和间隙压力压缩变形，研究了煤体渗流率的变化规律。结果如下： (1) 在主应力和温度不变的情况下，渗流率随气体压力呈先减小后缓和的趋势；当气体压力和主应力保持不变时，渗透率随着温度的降低而增加；在压力和温度保持不变的情况下，渗流速率的变化与主应力呈“V”形。(2) 含气煤应变曲线先减小后增大；即在压缩阶段和弹性阶段，随着应变的增加，渗流率逐渐降低，而在屈服阶段和破坏阶段，随着应变的增加，渗流率增加。(3) 在体积应力增加的过程中，在孔隙压实阶段渗流率逐渐降低，从裂纹扩展到破坏峰值阶段渗流率逐渐增加，在达到峰值破坏后渗流率显着增加。根据测试结果，