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The size effect of a conical footing on N-gamma

Chakraborty, Manash and Kumar, Jyant (2016) The size effect of a conical footing on N-gamma. In: COMPUTERS AND GEOTECHNICS, 76 . pp. 212-221.

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Official URL: http://dx.doi.org/10.1016/j.compgeo.2016.03.010


By incorporating the diameter (size) effect of a conical footing, the factor N-gamma has been computed. The analysis has been performed by using the lower bound theorem of limit analysis in combination with finite elements and linear optimization. By using an iterative procedure, the dependency of peak friction angle (phi) on mean stress (sigma(m)) has been incorporated to obtain N-gamma for various cone apex angles (alpha) with several cone diameters (B) covering almost entire possible ranges of model and field cone footing sizes. Three different phi-sigma(m) curves reported from literature, associated with Hostun and Toyoura sands, were chosen. For the value of B approximately greater than (i) 0.45 m for a smooth footing, and (ii) 0.85 m for a rough footing, the magnitude of N-gamma decreases almost linearly with an increase in B on a log-log scale. For the value of B greater than about 8.0 m, the factor N-gamma shows only a little change with an increase in the footing diameter. The results from the analysis compare well with the data reported in literature. (C) 2016 Elsevier Ltd. All rights reserved.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
Keywords: Bearing capacity; Failure; Finite elements; Foundations; Limit analysis; Sands
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 22 Jun 2016 05:26
Last Modified: 22 Jun 2016 05:26
URI: http://eprints.iisc.ac.in/id/eprint/54039

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