A Fractal-Based Model for Fracture Deformation Under Shearing and Compression

Quantitative study on coal permeability evolution with consideration of shear dilation

“…It is because shear deformation induces fracture opening, as the asperities on the opposed sides of a fracture slide over each other and consequently cause an increase in aperture. The resulting changes in aperture can cause as much as a three-orders-ofmagnitude change in conductivity at moderate compressive stress (Wei et al, 2013). Based on our previous work (Wei et al, 2013), the model for the shear-induced aperture deformation based on the fractal characteristics of fracture surfaces is given as follow:…”

“…In this study, a coal permeability model that includes the combined impact of both normal stress and shear dilation is developed to evaluate the dynamic evolution of coal permeability. The effect of shear dilation was represented by a fractal-based model (Wei et al, 2013). The permeability model is extended to define the evolution of gas sorption-induced permeability anisotropy under variable stress conditions including normal stress and shear stress, and implemented into a fully coupled coal deformation, gas flow and transport in the matrix system, and gas flow and transport in the fracture system model.…”

Hydraulic and Mechanical Relationship of Individual Fracture in Rock under Compression and Shearing: Theoretical Study

“…Chen et al [19] presented a strain-dependent formulation to address the change in hydraulic conductivity resulted from normal and shear loads. Wei and Liu [20] presented a fractal-based model for fracture deformation under shearing and compression. Although considerable progress has been made in the past four decades, models for describing the hydromechanic behavior with different conditions should be further studied [21][22][23].…”