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Effect of Strength Parameter a in the Generalized Hoek-Brown Failure Criterion and the Reinforcement Thickness on the Elasto-plastic Behavior of Circular Tunnel  

Lee, Youn-Kyou (군산대학교 해양시스템공학)
Park, Kyung-Soon (군산대학교 대학원 해양산업공학과)
Publication Information
Explosives and Blasting / v.26, no.2, 2008 , pp. 20-28 More about this Journal
Abstract
In the design stage of a tunnel, the wall convergence is commonly estimated through an elasto-plastic analysis of the tunnel, which has been a topic drawing many researcher's attention so far. Despite its importance, however, the elasto-plastic behavior of a circular tunnel excavated in a generalized Hoek-Brown rockmass is still poorly understood. In this study, a simple munerical method based on Lee & Pietruszczak (2008) for the elasto-plastic analysis of a circular tunnel surrounded by reinforced annulus is proposed. It is assumed that the tunnel is excavated in a strain-softening rockmass obeying the generalized Hoek-Brown failure condition. The commercial code FLAC is used for the verification of the proposed method. The influence of the Hoek-Brown strength parameter a and the thickness of the reinforcement annulus on the elasto-plastic behavior around the tunnel was discussed by conducting some example analyses. The results show that the influence of these two parameters on the distribution of stresses and displacements is substantial.
Keywords
Circular tunnel; Elasto-plastic analysis; Generalized Hoek-Brown failure condition; Strain-softening;
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Times Cited By KSCI : 2  (Citation Analysis)
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