Abstract
The design of shallow foundations relies on bearing capacity values calculated using empirical procedures that are based in part on solutions obtained using the method of characteristics, which assumes a soil that is perfectly plastic following an associated flow rule. In this paper the problem of strip and circular footings resting on the surface of a sand layer is analysed using the finite-element method. Analyses are performed using a two-surface plasticity constitutive model that realistically captures the aspects of the mechanical response of sands that are relevant to the bearing capacity problem. In particular, the model accounts for non-associated flow, strain-softening, and both stress-induced and inherent anisotropy. Based on the results of the analyses, the paper examines the validity of the bearing capacity factors N γ and shape factors s γ used in practice. A relationship for determining appropriate values of friction angle for use in bearing capacity calculations is also proposed.
Keywords
sands; bearing capacity; anisotropy; numerical modelling; plasticity; footings/foundations
Date of this Version
7-2-2010
Recommended Citation
Loukidis, D and Salgado, Rodrigo, "Effect of Relative Density and Stress Level on the Bearing Capacity of Footings on Sand" (2010). Lyles School of Civil Engineering Faculty Publications. Paper 5.
https://docs.lib.purdue.edu/civeng/5
Comments
10.1680/geot.8.P.150.3771