Simple approach to consolidation due to constant rate loading in clays

Hanna, Daniel, Sivakugan, Nagaratnam, and Lovisa, Julie (2013) Simple approach to consolidation due to constant rate loading in clays. International Journal of Geomechanics, 13 (2). pp. 193-196.

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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 t₀/2, where t₀ 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 t₀/2, estimate the degree of consolidation, and reduce it by 10% or (2) assume the load to act at 2t₀/5 rather than t₀/2 in estimating the degree of consolidation, with no further adjustment. Nevertheless, the single U-T 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 U-T values for constant rate of loading.

Item ID: 26074
Item Type: Article (Research - C1)
ISSN: 1943-5622
Keywords: consolidation, constant rate loading, ramp loading, one-dimensional consolidation, average degree of consolidation, time factor
Funders: Australian Research Council (ARC)
Date Deposited: 04 Apr 2013 05:53
FoR Codes: 09 ENGINEERING > 0905 Civil Engineering > 090501 Civil Geotechnical Engineering @ 100%
SEO Codes: 87 CONSTRUCTION > 8702 Construction Design > 870201 Civil Construction Design @ 100%
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