岩土力学Issue(z2)：448-455,8.
基于离散裂隙网络模型的节理岩体渗透张量及特性分析
Permeability tensor and seepage properties for jointed rock masses based on discrete fracture network model
摘要
Abstract
Joint systems in rock masses are geometrically complex; and investigation of the hydraulic properties is important for understanding the hydraulic behavior of jointed rock masses and stability analysis of rock engineering. A discrete fracture network (DFN) model was designed using C++language based on VC++6.0 platform to realize a fracture network for seepage analysis. The permeability coefficients, possibility of equivalent permeability tensors of the jointed rock masses were examined by simulating flow through DFN models of varying joint properties. A directionality coefficient was defined to quantitatively assess the principal flow direction in jointed rock masses. The results show that the permeability coefficients are anisotropic according to permeability tensor analysis for rock masses with only one set of joints. The degree of obliquities of joint plane affects obviously the principal direction of permeability. The permeability coefficients increase logarithmically with the increase of joints connectivity rates. In the scenarios where two sets of joints existed, the anisotropic properties vary with the joints geometrical distribution. The permeability anisotropy in a fracture network with two mutually perpendicular sets of joints still exists; and however, the directionality coefficients are examined smaller. For the dip angles whose probability distribution can be effectively by normal function, the permeability coefficients increase with increasing of the standard deviation. The principal direction of permeability runs similarly along the direction of angle bisector between two sets of joints.关键词
节理岩体/渗透张量/离散裂隙网络/定向性系数/各向异性Key words
jointed rock mass/permeability tensor/discrete fracture network(DFN)/directionality coefficient/anisotropy分类
建筑与水利引用本文复制引用
王培涛,杨天鸿,于庆磊,刘洪磊,夏冬,张鹏海..基于离散裂隙网络模型的节理岩体渗透张量及特性分析[J].岩土力学,2013,(z2):448-455,8.基金项目
国家重点基础研究发展计划项目（No.2013CB227902）；国家自然科学基金项目（No.50904013, No.51174045）；国家自然科学基金重点项目（No.51034001）；中央高校基本科研业务费专项资金资助项目（No. N090101001, No. N120601002）。 （）
