Shear Nonlinear Behavior of Rock Discontinuities with Different Joint Roughness Coefficients

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Shear Nonlinear Behavior of Rock Discontinuities with Different Joint Roughness Coefficients

Pengtao He ¹ , Chaoran Li ² , Wei Zheng ^3,*

1 School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;

2 Department of Civil, Environmental and Geomatic Engineering, University College London, London WC1E 6BT, UK;

3 School of Civil Engineering, Tongji University, Shanghai 200092, China; 2311847@tongji.edu.cn

https://doi.org/10.58531/ijge103100004

Received: 20 October 2023 / Accepted: 3 November 2023 / Published: 7 November 2023

Abstract

To study the shear failure behavior of rock discontinuity, direct shear tests are carried out on artificial rock discontinuity samples with different roughness under various normal stresses, the influence of roughness on the strength of rock discontinuity is studied, the nonlinear characteristics of rock discontinuity shear are studied according to the variation of shear stiffness. The results indicated that the strength of the rock discontinuity increases with the increase of roughness and exhibited a good linear relationship. With the increase of roughness, the peak value of shear deformation curve becomes more obvious, and the shear failure mode gradually changes from "abrasion" to "cutting ". With an increase in the normal stress and JRC, the energy stored in the sample increased, and the crack development rate from stable to unstable increased.

Keywords

Rock discontinuity; Shear failure behavior; Nonlinear feature; Roughness; Shear stiffness

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He P., Li C., Zheng W. Shear Nonlinear Behavior of Rock Discontinuities with Different Joint Roughness Coefficients. Int. J. Geo-Energy, 2023, 1(4), doi: 10.58531/ijge103100004

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Shear Nonlinear Behavior of Rock Discontinuities with Different Joint Roughness Coefficients

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