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Abstract
Within the framework of the kinematic approach of yield design theory, a new three-dimensional mechanism is proposed for the stability analysis of the tunnel face in cohesive-frictional material. The geometry of the mechanisms considered are based on logarithmic-spirals and depends on two parameters. The optimization leads to a critical mechanism which compares remarkably well with experimental and numerical observations. The kinematic bound of the critical face pressure is better than existing approaches, and is very close to value obtained by 3D numerical computations. To cite this article: D. Subrin, H. Wong, C. R. Mecanique 330 (2002) 513–519.
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