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应用自行设计的CSCG-160型重力液压恒载蠕变渗流试验系统,进行了煤样蠕变渗流特性试验,研究煤体蠕变过程中变形和渗流特性,并将试验结果与数值模拟结果进行了对比分析。研究结果表明:煤岩蠕变特性明显,蠕变载荷较小时,煤岩呈现衰减蠕变,较高的蠕变载荷水平下煤岩具有典型的蠕变3阶段;煤岩试样的环向应变随轴向应变的增大而增大,体积应变随轴向应变的增加呈现先增大后减小的趋势;煤岩渗透率随时间变化的曲线与煤岩蠕变试验曲线的变化趋势一致,煤岩的渗透率随蠕变载荷水平的增加而增大;煤岩蠕变过程的渗透率随轴向应变的增大而增大,渗透率增加的速率也随着轴向应变的增大而增大。
The self-designed CSCG-160 gravitational hydraulic constant creep seepage test system was used to test the creep seepage characteristics of coal samples and to study the deformation and seepage characteristics during the creep process of coal samples. The experimental results and numerical simulation results Comparative analysis. The results show that the creep characteristics of coal and rock are obvious. When the creep load is small, the coal rock exhibits decay creep. Under high creep load level, the coal rock has typical three stages of creep. The circumferential strain With the increase of axial strain, the volumetric strain increases first and then decreases with the increase of axial strain. The change trend of permeability of coal and rock over time is consistent with that of coal-rock creep test curve, The permeability of coal and rock increases with the increase of creep load. The permeability of coal and rock creep increases with the increase of axial strain, and the rate of increase of permeability increases with the increase of axial strain Increase.