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| Peak shear strength of 3D rock discontinuities based on anisotropic properties |
| CHEN Shijiang1，ZHU Wancheng2，WANG Chuangye1，WANG Chao1，GUO Lingfei1 |
| (1. Institute of Mining Research，Inner Mongolia University of Science and Technology，Baotou，Inner Mongolia 014010，China；2. School of Resources and Civil Engineering，Northeastern University，Shenyang，Liaoning 110000，China) |
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Abstract To date，some criteria have been proposed to estimate the peak shear strength of rock discontinuities. Although these criteria contribute to the understanding of the shear behaviour of rock joints，there are still some limitations that should be recognized. For example，these criteria cannot describe the anisotropic properties of rock discontinuities. Considering both asperity inclination angle and amplitude，a new parameter ? describing the discontinuity roughness is proposed in order to comprehensively predict the peak shear strength of rock discontinuities，which can be expressed by the anisotropic parameter SRv and amplitude parameter A. The anisotropic parameter SRv is obtained with the Variogram method. The relationship between JRC and ? is established through calculating ten standard roughness profiles and a shear strength model accounting for anisotropy was developed based on Barton?s peak shear strength criterion. The morphology of artificial rock discontinuities was measured with ShapeMetriX3D system，the parameter ? was calculated and the peak shear strength of the studied surface was estimated by the proposed method. Meanwhile，the shear tests on the artificial rock discontinuities were carried out. The new model of peak shear strength was validated with the results from shear tests.
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2016, Vol. 35 
