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  Multiple regression analysis of the effects of the weight ratios of clay minerals and fine-grained soils on the shear strength of fault rock

  A given rock mass is likely to contain geological structures such as faults, joints, and foliations formed as a result of tectonic activity. Such geological structures represent anisotropy and heterogeneity within the rock mass and lower its strength, reducing the overall stability of the rock mass, and acting as a geological risk factor for tunnel or slope excavation. Heterogeneity in particle composition and anisotropy in texture make it difficult to determine the bulk strength of fault rock. This explains why laboratory tests for determining strength parameters are while studies seeking to clarify the engineering traits of faults have largely been conducted with a focus on geological structures and the permeability of fault. To analyze the effects of the weight ratios of clay minerals and fine-grained soils on the shear strength of fault rock, this study conducted laboratory tests and a multiple regression analysis. A total of 111 samples of fault material were collected from faults distributed in host rocks of shale, mudstone, sandstone, granite, andesitic tuff, and andesite throughout Korea. Shear strength was determined in the laboratory using the direct shear test, applying normal stress perpendicular to the shear surface. In addition, particle size, XRD, and SEM analyses were conducted to quantitatively obtain the weight ratios of clay minerals and fine-grained soils. A multiple regression analysis for 97 data points obtained through laboratory tests was then conducted, while the applicability of this approach was assessed using the 14 sets of data that had not been used for the multiple regression analysis.

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