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A Constitutive Model for Shear Behavior of Rock Joints Based on Three-Dimensional Quantification of Joint Roughness

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Authors
Park, Jung-Wook; Lee, Yong-Ki; Song, Jae-Joon; Choi, Byung-Hee
Issue Date
2013-11
Publisher
Springer Vienna
Citation
Rock Mechanics and Rock Engineering Vol.46 No.6, pp. 1513-1537
Keywords
복합학Rock jointConstitutive model for shear behaviorContact areaJoint roughness quantificationConstant normal load conditionConstant normal stiffness condition
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.
ISSN
0723-2632 (print)
1434-453X (online)
Language
English
URI
http://hdl.handle.net/10371/84897
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Energy Systems Engineering (에너지시스템공학부)Journal Papers (저널논문_에너지시스템공학부)
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