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A Three-Dimensional Progressive Failure Model for Joints Considering Fracture Mechanics and Subcritical Crack Growth in Rock  

Kim, Chee-Hwan (우석대학교 토목공학과)
Kemeny, John (아리조나 주립대학 자원지질공학과)
Publication Information
Tunnel and Underground Space / v.19, no.2, 2009 , pp. 86-94 More about this Journal
Abstract
A three dimensional rock joint element was developed considering fracture mechanics and subcritical crack growth to simulate non-linear behavior and the progressive failure of rock joints. Using this 3-D joint element, joint shear tests of rock discontinuities were simulated by a numerical method. The asperities on the joint surface began to fail at stress levels lower than the rock fracture toughness and continued progressively due to subcritical crack growth. As a result of progressive failing in each and every asperity, the joint showed non-linear stress-time behavior including stress hardening/softening and the reaching of a residual stress.
Keywords
rock fracture mechanics; progressive failure; subcritical crack growth; time-dependent cohesion;
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