Seismic Bearing Capacity of Strip Foundation Embedded in c-ϕ Soil Slope
Publication: International Journal of Geomechanics
Volume 18, Issue 7
Abstract
In this paper, seismic bearing capacity factors for shallow strip foundations embedded in homogeneous c-ϕ soil slopes are presented. A numerical study is performed using finite-element limit analysis (FELA) with lower bound (LB), upper bound (UB), and 15-node (15N) mixed Gauss element formulations. The pseudostatic approach is used to consider the seismic action on both soil and foundation. The study explores the influence of different governing parameters, namely slope angle (β), angle of internal friction (ϕ), foundation embedment depth ratio (D/B, where D = depth of the footing from slope surface; and B = width), and horizontal seismic coefficient (αh), on the ultimate bearing capacity of the embedded strip foundation. The bearing capacity factors Ncs and Nγqs decrease rapidly with an increase in β and αh, and an increase with D. Compared with Ncs, the factor Nγqs is more sensitive to the changes in β, ϕ, D/B, and αh. Based on the results obtained from the study, a set of design charts and a simple spreadsheet-based tool (SBCSFES ) are developed.
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Acknowledgments
The research work presented in this paper was supported by the Institute Fellowship to the first author from the Ministry of Human Resource Development, the Government of India. The authors are grateful to Optum Computational Engineering (OptumCE) for providing a free academic license for OptumG2 software to perform the present study.
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Published In
International Journal of Geomechanics
Volume 18 • Issue 7 • July 2018
Copyright
© 2018 American Society of Civil Engineers.
History
Received: Sep 7, 2017
Accepted: Jan 26, 2018
Published online: May 8, 2018
Published in print: Jul 1, 2018
Discussion open until: Oct 8, 2018
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