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Comparison between Direct and Indirect Implementation of Generalized Hoek and Brown Failure Criterion in Numerical Analysis Procedure  

Deb Debasis (Mining Engineering Department, IIT, Kharagpur)
Choi Sung O. (Korea Institute of Geoscience & Mineral Resources)
Publication Information
Tunnel and Underground Space / v.15, no.3, 2005 , pp. 228-235 More about this Journal
Abstract
Friction angle and cohesion of rock masses can be estimated from Hoek and Brown failure criterion and then plastic corrections can be applied using Mohr-Coulomb yield function. This study finds that this estimation procedure would not be appropriate for weak rock masses and for cases where low confining stress is expected to develop. A procedure is outlined in this paper for estimating plastic corrections directly from Hoek and Brown material model. Comparative study shows that direct procedure would simulate non-linear failure surface better than indirect procedure especially in the low confining stress regime.
Keywords
Hoek and Brown failure criterion; Mohr-Coulomb yield function; plastic correction; direct procedure, indirect procedure;
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