| Citation: | WEI Juanhua，FU Hao，TANG Zhaohui，et al. Method study of calculating the permeability coefficient of fractured rock mass with dense sections[J]. Bulletin of Geological Science and Technology，2025，${article_volume}（0）：1-11 doi: 10.19509/j.cnki.dzkq.tb20230680
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The seepage of fractured rock masses has non-uniformity and anisotropy, and its complexity is reflected in parameters such as density, orientation, and trace length of individual fractures, as well as the connectivity of fracture networks. The connectivity of fracture networks is a difficult problem in calculating the seepage parameters of three-dimensional fractured rock masses. At present, the calculation methods for seepage parameters of three-dimensional fractured rock masses have their own advantages and disadvantages due to different models. To analyze the hydraulic anisotropy and permeability coefficient of fractured rock masses, a new method for solving the permeability coefficient of three-dimensional fractured rock mass dense sections based on dimensionality reduction is proposed.
This method, founded on the simulation of three-dimensional fracture networks, approximates the fractured rock masses through dense sections in different directions, decomposing the three-dimensional fracture network into multiple continuous two-dimensional sectional fracture networks, using graph theory to analyze the hydraulic connectivity and permeability paths, and water head boundary conditions are set to calculate the permeability coefficient. Through the relationship between lines, surfaces, and volumes in space, the calculated permeability coefficient in two-dimensional space is expressed as the directionality in three-dimensional space, and the permeability tensor of the three-dimensional fractured rock mass network is constructed.
By treating the section permeability coefficient as a permeability ellipse, the new method calculates the equivalent permeability coefficient of the section and provides a solution formula for the equivalent permeability tensor of the rock mass. It also discusses the scale effect and the representation of anisotropy in the rock mass. By constructing three-dimensional and two-dimensional fracture networks, different sizes of unit cells were intercepted to calculate the permeability coefficient, and the side length of a typical unit cell was determined to be 20m. The feasibility of the method was verified through field drilling water pressure experiments.
This method offers a reference for solving the permeability coefficients in different directions of heterogeneous fractured rock masses of various scales.
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