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Abstract Firstly，a new roughness index SRI is proposed based on joint profiles，which consists of three roughness parameters describing average undulation，directivity，distribution and fractal characteristics of joint profile roughness；and the relationship between SRI and JRC(joint roughness coefficient) is also established. Then，SRI is extended to three-dimensional(3D) form based on the triangular element network of joint surface to characterize 3D morphology characteristics of joint. Finally，SRI is used to quantify morphology of tensile granite joint and isotropic morphology characteristics can be represented. The new index has definite physical meaning and can be calculated conveniently. It also can characterize the primary roughness characteristics of rock joint. The new roughness index has set a foundation for further studying the shear mechanical characteristics of rock joint，and it has important theoretical significance for rock mechanics.
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Received: 17 April 2013
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2013, Vol. 32 
