Abstract
A new constitutive model to describe the shear behavior of rock joints under constant normal stiffness (CNS) and constant normal load (CNL) conditions is proposed. The model was developed using an empirical approach based on the results of a total of 362 direct shear tests on tensile fractured rock joints and replicas of tensile joints and on a new quantitative roughness parameter. This parameter, the active roughness coefficient C r, is derived from the features of the effective roughness mobilized at the contact areas during shearing. The model involves a shear strength criterion and the relations between stresses and displacements in the normal and shear directions, where the effects of the boundary conditions and joint properties are considered by the shape indices C d and C f. The model can be used to predict the shear behavior under CNS as well as CNL conditions. The shear behavior obtained from the experimental results is generally in good agreement with that estimated by the proposed model, and the effects of joint roughness, initial normal stress, and normal stiffness are reasonably reflected in the model.
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Acknowledgments
This research was supported by a National Research Foundation of Korea (NRF) grant funded by the Ministry of Education, Science, and Technology of Korea (No. 2012-0005326), and supported by a Basic Research Project of the Korea Institute of Geoscience and Mineral Resources (KIGAM, GP2012-001) funded by the Ministry of Knowledge and Economy of Korea. We appreciate anonymous reviewers for their valuable comments and suggestions to improve this manuscript.
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Park, JW., Lee, YK., Song, JJ. et al. A Constitutive Model for Shear Behavior of Rock Joints Based on Three-Dimensional Quantification of Joint Roughness. Rock Mech Rock Eng 46, 1513–1537 (2013). https://doi.org/10.1007/s00603-012-0365-4
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DOI: https://doi.org/10.1007/s00603-012-0365-4