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Prediction of Strength for Transversely Isotopic Rock Based on Critical Plane Approach  

Lee, Youn-Kyou (군산대학교 해양시스템공학)
Publication Information
Tunnel and Underground Space / v.17, no.2, 2007 , pp. 119-127 More about this Journal
Abstract
Based on the critical plane approach, a methodology far predicting the anisotropic strength ot transversely isotropic rock is Proposed. It is assumed that the rock failure is governed by Hoek-Brown failure criterion. In order to establish an anisotropic failure function, Mohr envelope equivalent to the original Hoek-Brown criterion is used and the strength parameters m, s are expressed as scalar functions of orientation. The conjugate gradient method, which is one of the robust optimization techniques, is applied to the failure function for searching the orientation giving the maximum value of the anisotropic function. While most of the existing anisotropic strength models can be applied only when the stress condition is the same as that of conventional triaxial compression test, the proposed model can be applied to the general 3-dimensional stress conditions. Through the simulation of triaxial compression tests for transversely isotropic rock sample, the validity of the proposed method is investigated by comparing the predicted triaxial strengths and inclinations of failure plane.
Keywords
Critical plane approach; Transversely isotropic rpck; Hoek-Brown failure criterion; Strength anisotropy;
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