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杨建平, 陈卫忠, 吴月秀, 谭贤君. 裂隙岩体等效渗透系数张量数值法研究[J]. 岩土工程学报, 2013, 35(6): 1183-1188.
引用本文: 杨建平, 陈卫忠, 吴月秀, 谭贤君. 裂隙岩体等效渗透系数张量数值法研究[J]. 岩土工程学报, 2013, 35(6): 1183-1188.
YANG Jian-ping, CHEN Wei-zhong, WU Yue-xiu, TAN Xian-jun. Numerical study on equivalent permeability tensor of fractured rock masses[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(6): 1183-1188.
Citation: YANG Jian-ping, CHEN Wei-zhong, WU Yue-xiu, TAN Xian-jun. Numerical study on equivalent permeability tensor of fractured rock masses[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(6): 1183-1188.

裂隙岩体等效渗透系数张量数值法研究

Numerical study on equivalent permeability tensor of fractured rock masses

  • 摘要: 由于核废料地质储存、地热开采、深部油气开采的工程需求,裂隙岩体渗透性及其随着应力、温度的影响受到广泛关注。通过温度-渗流-应力耦合三轴仪对大理岩人工裂隙渗透率随应力及温度变化规律进行了试验研究,获得了大理岩闭合裂隙渗透率随应力、温度的变化趋势及受影响程度。在试验基础上,通过数值方法研究了裂隙岩体等效渗透系数的尺寸效应及各向异性,获得了该裂隙岩体的等效渗透系数REV及渗透张量。

     

    Abstract: Determination of permeability dependence of fracture on stresses and temperatures is the basis of safety evaluation in geological disposal of radioactive waste, geothermal exploitation and underground gas/oil exploitation. By means of the developed temperature-permeability-stress test equipment, permeability variation of an artificial rock fracture is studied under different stresses and temperatures. The test results show that the permeability decreases about a half as pressure increases from 9 MPa to 20 MPa, and the closure of fracture cannot recover its initial state as the pressure decreases. When the temperature increases from 19.7℃ to 56.1℃, the fracture permeability decreases about a half. At the end, transport properties of fractured rock masses, in which the fracture network is generated by Mont Carlo method, are studied by using UDEC code based on the fracture test results. The seepage REV and the corresponding equivalent permeability tensor of the fractured rock masses are obtained.

     

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