摘要
针对岩体裂隙系统提出了计算各向异性渗透系数的方法，给出了使用有限差分法计算各向异性渗透系数的数值方法和差分单元渗透性的计算公式，并以实际裂隙网络系统资料为基础进行了该方法的应用探讨．该方法可以在已知裂隙网络的基础之上计算岩体的各向异性渗透系数．通过加密剖分网，它可以更好地消除裂隙非贯通性的影响，并可以处理裂隙充填等问题．此外还可以分析裂隙岩体渗透性随测量窗口尺度大小的变化。
A new approach for the calculation of permeability tensor in fractured rock mass is proposed.The numerical method of finite difference is applied to estimating the anisotropic permeability and the determination of the permeability values assigned to grid elements for representation of fractures and rock matrix in the elements is also described.A natural fracture system is mapped and the method presented is applied to calculating its anisotropic permeability.Calculation results indicate that the method proposed can be used to calculate the permeability tensor of a given fracture pattern in a rock mass.This method has advantages in the determination of permeability tensor compared with direct calculation method because fractures of finite lengthes that take a great ratio in a natural fracture system are well represented in this method,but in the direct method they are not.In addition,it can be used to analyze the effectiveness of sampling sizes on permeability,and also used to determine if a fracture system can be described by an equivalent porous medium.
出处
《武汉水利电力大学学报》
EI
CSCD
1997年第2期49-53,共5页
Engineering Journal of Wuhan University
基金
中国博士后科学基金
关键词
岩体
裂隙
有限差分法
渗透系数
渗流计算
rock mass
fisstured medium
finite difference methods
permeability grid element
equivalent permeability
