Strain Influence Diagrams for Settlement Estimation of Both Isolated and Multiple Footings in Sand
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 134, Issue 4
Abstract
Most of the existing methods for estimating settlements of footings in sand have been developed for either isolated square footings or for strip footings. The literature contains limited information on settlement analysis of rectangular footings, and, as a result, there is no way to accurately account for the effect of the footing length-to-width ratio on settlement. Additionally, no practical method exists for considering the interaction between neighboring footings in settlement estimates. In this paper, we use Schmertmann’s framework to propose a method of settlement estimation that takes full account of both the footing length-to-width ratio and the proximity of neighboring footings. Three-dimensional nonlinear finite element analyses were performed for various multiple footing configurations. Plate load tests were performed in sands using both a single plate and two plates separated by various distances. The numerical and experimental results indicate that the shape of the footing (expressed through its length-to-width ratio) and the proximity of neighboring footings affect two parameters of the strain influence diagram (which is the basis for the settlement estimation method): the depth to the peak influence factor and the depth of the strain influence zone. We propose new strain influence diagrams for estimation of settlement under these more general conditions.
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© 2008 ASCE.
History
Received: Aug 16, 2006
Accepted: Sep 10, 2007
Published online: Apr 1, 2008
Published in print: Apr 2008
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