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http://dx.doi.org/10.7474/TUS.2018.28.1.059

Numerical Investigation of the Radial Convergence of Circular Tunnel Excavated in Rock Mass for Generalized Hoek-Brown  

Lim, Kwang-Ok (Department of Ocean Science and Engineering, Kunsan National University)
Lee, Youn-Kyou (Department of Coastal Construction Engineering, Kunsan National University)
Publication Information
Tunnel and Underground Space / v.28, no.1, 2018 , pp. 59-71 More about this Journal
Abstract
Since the generalized Hoek-Brown (GHB) function predicts the strength of the jointed rock mass in a systematic manner by use of GSI index, it is widely used in rock engineering practices. In this study, a series of 2D elasto-plastic FE analysis, which adopts the GHB criterion as a yield function, was carried out to investigate the radial convergence characteristics of circular tunnel excavated in the GHB rock mass. The effect of the plastic potential function on the elasto-plastic displacement was also examined. In the analysis, the wide range of both the $K(={\sigma}_h/{\sigma}_v)$ and GSI values are considered. For each K value, the variation of the ratio of sidewall displacement to roof displacement was calculated with varying GSI values and the obtained displacement patterns were analysed. The calculation results show that the displacement ratio significantly depends not only on the K value but also on the range of GSI value. In particular, for lower range of GSI value, the displacement ratio pattern calculated in the elasto-plastic regime is opposite to that predicted by the elasticity theory. In addition, the variation of the radial displacement ratio with GSI value for different types of plastic potential function showed similar trend.
Keywords
Generalized Hoek-Brown criterion; Elasto-Plastic analysis; Plastic potential function; Tunnel convergence;
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