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New criterion for rock joints based on three-dimensional roughness parameters

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Abstract

The shear behavior of rock joints is important in solving practical problems of rock mechanics. Three group rock joints with different morphologies are made by cement mortar material and a series of CNL (constant normal loading) shear tests are performed. The influences of the applied normal stress and joint morphology to its shear strength are analyzed. According to the experimental results, the peak dilatancy angle of rock joint decreases with increasing normal stress, but increases with increasing roughness. The shear strength increases with the increasing normal stress and the roughness of rock joint. It is observed that the modes of failure of asperities are tensile, pure shear, or a combination of both. It is suggested that the three-dimensional roughness parameters and the tensile strength are the appropriate parameter for describing the shear strength criterion. A new peak shear criterion is proposed which can be used to predict peak shear strength of rock joints. All the used parameters can be easily obtained by performing tests.

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Correspondence to Zhi-cheng Tang  (唐志成).

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Foundation item: Project(41130742) supported by the Key Program of National Natural Science Foundation of China; Project(2014CB046904) supported by the National Basic Research Program of China; Project(2011CDA119) supported by Natural Science Foundation of Hubei Province, China; Project(40972178) supported by the General Program of National Natural Science Foundation of China

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Tang, Zc., Liu, Qs. & Huang, Jh. New criterion for rock joints based on three-dimensional roughness parameters. J. Cent. South Univ. 21, 4653–4659 (2014). https://doi.org/10.1007/s11771-014-2473-7

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  • DOI: https://doi.org/10.1007/s11771-014-2473-7

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