在不同温度和孔隙水压条件下,研究砂岩三轴压缩过程中渗透特性的演化规律,研究多场耦合作用下岩石渗透率与力学性质的演化规律,结合CT技术从细观角度进行验证温度和水对裂隙损伤演化的影响.研究结果表明:渗透率随着岩样的变形而变化,其变化趋势与岩样受载变形破坏的发展阶段相对应.三轴压缩状态下,渗透率对轴向力和径向变形密切相关.温度的作用降低了峰值强度、残余强度和切线模量,增大了泊松比.孔隙水压和温度的作用增大了岩体塑性,损伤减小.由于孔隙水压的增大使得有效应力减小,水楔作用、润滑作用和软化作用的存在,相同温度条件下,峰值强度、残余强度和切线模量随之减小,泊松比增大.孔隙水压的提高造成了更大的渗透率.温度的升高导致渗透率降低.%The permeability of sandstone was studied under triaxial compression subjected to different temperatures and pore pressures. The evolution of rock permeability and mechanical properties under multi-field coupling was discussed and effects of temperature and water on fracture evolution were studied with CT technology. The results show that the permeability changes with deformation. The change in permeability was tightly related with the damage deformation process of rock, as well as axial stress and radial strain. Increasing temperature reduced the peak strength, residual strength and tangent modulus, but increased Poisson's ratio. Pore water pressure and temperature increased the plasticity of rock to reduce damage. Peak strength, residual strength and tangent modulus decreased, while Poisson's ratio increased due to less effective stress caused by pore pressure and effects of water wedge, lubrication, softening. The larger pore pressure causes the larger permeability. An increase in temperature resulted in less permeability.
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