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为探究煤岩体峰前峰后的渗流蠕变规律,设计了基于自主研发三轴渗流蠕变测试仪的渗流蠕变实验.通过采用控制变量法分别递增围压、轴压、孔压,拟合曲线得出了随着围压、轴压、孔压的分别递增情况下的煤岩体峰前及峰后渗流蠕变规律.实验结果表明:煤岩体未破碎之前,渗流量与孔压成正比、与围压成反比,且随着裂隙的增多,渗流量也会逐渐增大;煤岩体蠕变速率随着轴压的增大而增大;峰后煤岩的裂隙会在轴压和水流作用下先扩张后压密,轴向变形和横向变形的速率急速增长,轴压随着松弛不断降低后趋于平缓,渗流量随着裂隙的变化先增大后减少,围压在横向变形作用下不断上升.
In order to explore the seepage creep law after the pre-peak of coal and rock mass, a seepage creep experiment based on the self-developed three-axis seepage creep tester was designed. By using the control variables, the confining pressure, axial pressure and pore pressure were increased respectively The curves of seepage creep under the condition of confining pressure, axial pressure and pore pressure increase with the increase of pore pressure respectively.The experimental results show that before the coal and rock mass are not crushed, the seepage and pore pressure And is proportional to the confining pressure, and with the increase of fractures, the seepage volume will also gradually increase; the creep rate of coal and rock mass increases with the increase of axial pressure; the fracture of coal and rock after the peak will occur on the axis Under the action of pressure and water flow, the pressure increases first and then compresses, and the axial deformation and lateral deformation increase rapidly. The axial pressure decreases gradually and then tends to be gentle. The seepage flow firstly increases and then decreases with the change of fracture. Horizontal deformation under the rising.