Abstract：Both numerical methods and single-hole packer tests are used in study of the representative elementary volume(REV) and three-dimensional(3D) permeability tensor for fractured rock masses. Based on the probability distribution functions and corresponding statistical parameters investigated in field，3D stochastic discrete fracture networks are randomly generated using the Monte Carlo method. The composite element method(CEM) is used to obtain the permeability tensor and REV of rock masses，with a large quantity of calculations concerning different sample sizes in various directions. The permeability tensor is then modified and improved by using single-hole packer test results. Finally, the proposed method is used in determining the permeability properties of dam foundation of Xiaowan hydropower station. The results show that the proposed method is feasible and reliable.
JING L，MA Y，FANG Z. Modeling of fluid flow and solid deformation for fractured rocks with discontinuous deformation analysis(DDA) method[J]. International Journal of Rock Mechanics and Mining Sciences，2001，38(3)：343-355.
<body>Your browse does not support frame!</body> " target="_blank">
WANG M，KULATILAKE P H S W，UM J，et al. Estimation of REV size and three-dimensional hydraulic conductivity tensor for a fractured rock mass through a single well packer test and discrete fracture fluid flow modeling[J]. International Journal of Rock Mechanics and Mining Sciences，2002，39(7)：887-904.
MIN K B，JING L，STEPHANSSON O. Determining the equivalent permeability tensor for fractured rock masses using a stochastic REV approach：method and application to the field data from Sellafield，UK[J]. Hydrogeology Journal，2004，12(5)：497-510.
<body>Your browse does not support frame!</body> " target="_blank">
CHEN S H，FENG X M，ISAM S. Numerical estimation of REV and permeability tensor for fractured rock masses by composite element method[J]. International Journal for Numerical and Analytical Methods in Geomechanics，2008，32(12)：1 459-1 477.
<body>Your browse does not support frame!</body> " target="_blank">
纪成亮，李晓昭，王 驹，等. 裂隙岩体渗透系数确定方法研究[J].工程地质学报，2010，18(2)：235-340.(JI Chengliang，LI Xiaozhao，WANG Ju，et al. Discrete fracture network model for hydraulic conductivity of fractured rock mass[J]. Journal of Engineering Geology，2010，18(2)：235-340.(in Chinese))
2014, Vol. 33 
