Simple Approach to Consolidation Due to Constant Rate Loading in Clays
Publication: International Journal of Geomechanics
Volume 13, Issue 2
Abstract
Terzaghi’s one-dimensional consolidation theory is extended to constant rate of loading, where a simple expression relating average degree of consolidation and time factor is derived. This expression is used to assess Terzaghi’s approximation that the ramp load can be assumed as an instantaneous load, applied at , where is the duration of loading. It is shown that this assumption overestimates the degree of consolidation by approximately 10%. Terzaghi’s approximation can be improved in two simple ways: (1) assume the load acts at , estimate the degree of consolidation, and reduce it by 10% or (2) assume the load to act at rather than in estimating the degree of consolidation, with no further adjustment. Nevertheless, the single expression developed herein maintains a level of simplicity comparable to Terzaghi’s approximation and is adequate for all practical purposes for computing the degree of consolidation during the loading, as well as beyond completion of loading. A numerical example is also given to illustrate the use of the proposed values for constant rate of loading.
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Acknowledgments
Financial support from Australian Research Council Linkage Project No. LP0989164, Coffey Geotechnics, and Port of Brisbane Corporation is gratefully acknowledged.
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© 2013 American Society of Civil Engineers.
History
Received: Jun 26, 2011
Accepted: Nov 22, 2011
Published online: Nov 24, 2011
Published in print: Apr 1, 2013
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