Effect of footing width on N gamma

Kumar, Jyant and Khatri, VN (2008) Effect of footing width on N gamma. In: Canadian Geotechnical Journal, 45 (12). pp. 1673-1684.

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Abstract

By incorporating the dependency of soil friction angle () on mean principal stress (σm), the effect of footing width (B) on bearing capacity factor (Nγ) is examined for a rough strip footing. The analysis is performed by means of a numerical lower bound limit analysis in conjunction with triangular finite elements and linear programming. To account for the variation of with σm, a solution is obtained by using an iterative procedure. Two well defined –σm curves from the literature, associated with Hoston and Toyoura sands that correspond to relative densities of 18% and 74.5%, respectively, are used. The magnitude of Nγ is computed for different footing widths. It is noted that for B greater than about 0.2 m, the magnitude of Nγ varies almost linearly with B on a log–log scale. For different footing widths, a good comparison is seen between the obtained rigorous solution and that obtained by using a constant value of , which corresponds to the equivalent mean normal stress level as defined by De Beer.

Item Type:	Journal Article
Publication:	Canadian Geotechnical Journal
Publisher:	NRC Research Press
Additional Information:	Copyright of this article belongs to NRC Research Press.
Keywords:	bearing capacity;failures;finite elements;footings;limit analysis;sands;stress level.
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	09 Sep 2009 09:19
Last Modified:	19 Sep 2010 05:00
URI:	http://eprints.iisc.ac.in/id/eprint/18143

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