New three-dimensional shear strength criterion of discontinuities with different joint wall compressive strengths

Abstract

The determination of discontinuity shear strength is an important concern in rock engineering. Previous research mainly focused on the shear behavior of discontinuities with identical joint wall compressive strengths (DIJCS). However, the shear behavior of discontinuities with different joint wall compressive strengths (DDJCS) and 3D surface morphology had been rarely reported. In this study, matched mortar DDJCSs were prepared using 3D printed photosensitive resin molds. Direct shear tests were carried out under three kinds of normal stress (ranging from 0.5 to 3.0 MPa) to analyze the shear strength and contact zones of DDJCS during shearing. The results show that the contact zones of DDJCS during shearing are scattered in the steep zones facing the shear direction. It is verified that Grasselli and Develi’s directional surface roughness characterization method can be used to predict the shear-induced potential contact zones of DDJCS. When the critical apparent dip angle is equal to the peak dilation angle, the predicted contact area agrees well with the actual contact area. A 3D directional roughness parameter with clear physical meaning was introduced to characterize discontinuity surface roughness. A 3D modified joint roughness coefficient-joint wall compressive strength (JRC-JCS) criterion that can both predict the shear strength of DDJCS and DIJCS was proposed based on the newly defined roughness parameter. The proposed criterion was validated by 77 direct shear tests presented by this study and 163 direct shear tests presented by other investigators. The results show that the proposed criterion was generally reliable for the peak shear strength prediction of DDJCS and DIJCS (within 16%). It is also found that the new criterion can capture the anisotropy of the peak shear strength of DDJCS. The anisotropy of DDJCS decreases with increasing normal stress. It should be noted that the anisotropy of the shear strength of DDJCS was not investigated experimentally, and further experiments should be conducted to verify it.

Keywords

discontinuities with different joint wall compressive strengths (DDJCS) / 3D printing / directional roughness characterization method / shear-induced potential contact zones / peak shear strength / JRC-JCS criterion / anisotropy

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