中等延展性裂隙岩体典型单元体及其渗透张量

岩石力学工程中常利用等效多孔介质方法研究裂隙岩体水力特征,等效渗透系数就是等效方法中的重要参数,典型单元体(REV)尺度与存在性决定了等效渗透系数的可靠性和有效性。因此,研究典型单元体的尺度和存在性有重要意义。利用随机方法和水量均衡法开发离散网格软件FractureToKarst研究裂隙岩体渗透问题,从理论推导和多元线性回归分析两种方法验证了程序在研究裂隙岩体渗流的尺度效应的可靠性。以此为基础建立了两组正交中等迹线长度的二维裂隙网格,讨论了此类裂隙岩体REV的存在性及尺度与其裂隙间距的关系,并通过统计学的方法求解出渗透系数张量。

Determining the REV and permeability tensor of rock masses and medium persistence fractures

Hydrodynamics of discontinuous fractured rock mass is always studied by equivalent porous medium model in the rock engineering. Equivalent permeability plays a key parameter in the equivalent study method. It is significant to study the size and existence of representative element volume （REV） for which determines its reliability and validity. The permeability of fractured rock mass is studied by a numerical program, FractureToKarst which is compiled based on random and water balance method. The validity of the program on scale effect is verified by multiple linear regression and theoretical derivation. Two sets of orthogonal and medium persistence fractures the REV is determined. The existence of REV and the relationship between scale and joint aperture is discussed. The permeability tensor is derived by the multiple linear regression method.