Preprint Article Version 1 This version is not peer-reviewed

Analysis of Face Stability of Circular Tunnel in Purely Cohesive Soils Driven by Shield

Version 1 : Received: 23 November 2018 / Approved: 26 November 2018 / Online: 26 November 2018 (10:24:21 CET)

How to cite: Liu, J.; Ding, W.; Wang, M. Analysis of Face Stability of Circular Tunnel in Purely Cohesive Soils Driven by Shield. Preprints 2018, 2018110582 (doi: 10.20944/preprints201811.0582.v1). Liu, J.; Ding, W.; Wang, M. Analysis of Face Stability of Circular Tunnel in Purely Cohesive Soils Driven by Shield. Preprints 2018, 2018110582 (doi: 10.20944/preprints201811.0582.v1).

Abstract

Based on the kinematic approach of the limit analysis and slip-line theories, this paper proposes a new 2D analytical model to evaluate the collapse support pressure to ensure the face stability of a circular tunnel in purely cohesive soils driven by a shield. The normality conditions, the yield criterion and the vertical soil arching effect are considered in the analytical model. Two upper bound solutions corresponding to the ratio of the cover to the diameter (C/D) are derived from considering the mechanisms based on the motion of rigid multi-blocks. Comparisons are made with existing upper and lower bound solutions published in previous articles. The results are close to the solutions of practical engineering. The failure mechanisms proposed in this study provide a better explanation for the failure process in the heading of the tunnel face.

Subject Areas

heading; stability; limit analysis; plane strain; slip-line

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