Research Article
Nov 1971
Scale and Boundary Effects in Foundation Analysis
Authors: James Graham and John Gordon StuartAuthor Affiliations
Publication: Journal of the Soil Mechanics and Foundations Division
Volume 97, Issue 11
Abstract
The bearing capacity of rough strip footings on sand is analyzed using numerical integration of the plasticity equations. The influence of different boundary conditions below the footing is studied for the zero surcharge case, and bearing capacity coefficients are calculated for various assumed settlements at failure. A pressure dependent solution is described which permits calculation of the variation of Φ with stress level in the failure zone. The results are compared with existing trial failure surface solutions and with experimental values. It is concluded that good agreement can be obtained between theoretical results which assume a trapped elastic wedge beneath the footing, and model results related to average Φ-values from triaxial tests in the normal range of cell pressures. The lack of agreement with field results and the computed variation of Φ in the failure zone imply that this relationship is empirical. A procedure is outlined for relating bearing capacity of a given-sized footing to the initial density of a sand using Φ versus pressure results from plane strain shear tests on sand at the same density.
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Information
Published In
Journal of the Soil Mechanics and Foundations Division
Volume 97 • Issue 11 • November 1971
Pages: 1533 - 1548
Copyright
© 1971 American Society of Civil Engineers.
History
Published in print: Nov 1971
Published online: Feb 12, 2021
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Authors
Affiliations
James Graham
Lecturer, Dept. of Civ. Engrg., Queen's Univ., Belfast, Northern Ireland
John Gordon Stuart
Sr. Lecturer, Dept. of Civ. Engrg., Queen's Univ., Belfast, Northern Ireland
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