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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/5054
Title: Seismic stability of a long unsupported circular tunnel
Authors: Sahoo J.P.
Kumar J.
Published in: Computers and Geotechnics
Abstract: The stability of a long unsupported circular tunnel (opening) in a cohesive frictional soil has been assessed with the inclusion of pseudo-static horizontal earthquake body forces. The analysis has been performed under plane strain conditions by using upper bound finite element limit analysis in combination with a linear optimization procedure. The results have been presented in the form of a non-dimensional stability number (. ? maxH/c); where . H=tunnel cover, . c refers to soil cohesion and . ? max is the maximum unit weight of soil mass which the tunnel can support without collapse. The results have been obtained for various values of . H/D (. D=. diameter of the tunnel), internal friction angle (. ?) of soil, and the horizontal earthquake acceleration coefficient (. ? h). The computations reveal that the values of the stability numbers (i) decrease quite significantly with an increase in . ? h, and (ii) become continuously higher for greater values of . H/D and . ?. As expected, the failure zones around the periphery of the tunnel becomes always asymmetrical with an inclusion of horizontal seismic body forces. ¬© 2012 Elsevier Ltd.
Citation: Computers and Geotechnics(2012), 44(): 109-115
URI: https://doi.org/10.1016/j.compgeo.2012.03.015
http://repository.iitr.ac.in/handle/123456789/5054
Issue Date: 2012
Keywords: Earthquakes
Finite elements
Limit analysis
Optimization
Stability
Tunnel
ISSN: 0266352X
Author Scopus IDs: 55171499200
7201861873
Author Affiliations: Sahoo, J.P., Department of Civil Engineering, Indian Institute of Science, Bangalore 560 012, India
Kumar, J., Department of Civil Engineering, Indian Institute of Science, Bangalore 560 012, India
Corresponding Author: Kumar, J.; Department of Civil Engineering, Indian Institute of Science, Bangalore 560 012, India; email: jkumar@civil.iisc.ernet.in
Appears in Collections:Journal Publications [CE]

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