On the stability of tunnels under gravity loading, with post-peak softening of the ground

C. Carranza-Torres, C. Fairhurst

Research output: Contribution to journalConference articlepeer-review

12 Scopus citations

Abstract

The effect of gravitational loads on the stability of horizontal circular tunnels excavated in an elasto-plastic (softening) materials is analyzed. Gravity loading in included in the analysis as body forces added to those due to the in situ stresses. The analysis considers the occurrence of a minimum in the ground reaction curve, i.e. the graphical representation of the radial support pressure required for equilibrium, of the excavation as a function of radial deformation at the excavation wall. The analysis is also extended to the face of the tunnel, where the three-dimensional is treated analytically under restrictive assumptions. Results obtained from the numerical analysis are presented; they confirm the results from the limit-depth analysis.

Original languageEnglish (US)
Pages (from-to)585
Number of pages1
JournalInternational journal of rock mechanics and mining sciences & geomechanics abstracts
Volume34
Issue number3-4
DOIs
StatePublished - Apr 1997
EventProceedings of the 1997 36th US Rock Mechanics ISRM International Symposium - New York, NY, USA
Duration: Jun 29 1997Jul 2 1997

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