NDLI: Stability of a long unsupported circular tunnel in soils with seismic forces

Content Provider	Springer Nature Link
Author	Chakraborty, Debarghya Kumar, Jyant
Copyright Year	2013
Abstract	By using the lower-bound finite element limit analysis, the stability of a long unsupported circular tunnel has been examined with an inclusion of seismic body forces. The numerical results have been presented in terms of a non-dimensional stability number (γH/c) which is plotted as a function of horizontal seismic earth pressure coefficient (k $_{h}$) for different combinations of H/D and ϕ; where (1) H is the depth of the crest of the tunnel from ground surface, (2) D is the diameter of the tunnel, (3) k $_{h}$ is the earthquake acceleration coefficient and (4) γ, c and ϕ define unit weight, cohesion and internal friction angle of soil mass, respectively. The stability numbers have been found to decrease continuously with an increase in k $_{h}$. With an inclusion of k $_{h}$, the plastic zone around the periphery of the tunnel becomes asymmetric. As compared to the results reported in the literature, the present analysis provides a little lower estimate of the stability numbers. The numerical results obtained would be useful for examining the stability of unsupported tunnel under seismic forces.
Starting Page	419
Ending Page	431
Page Count	13
File Format	PDF
ISSN	0921030X
Journal	Natural Hazards
Volume Number	68
Issue Number	2
e-ISSN	15730840
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-03-18
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Earthquakes Failure Limit analysis Soils Stability Tunnels Natural Hazards Hydrogeology Geophysics/Geodesy Geotechnical Engineering & Applied Earth Sciences Civil Engineering Environmental Management
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science Water Science and Technology

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