Discretisation of constant rate loading

Lovisa, J., Sivakugan, N., and Ameratunga, J. (2012) Discretisation of constant rate loading. In: ANZ 2012 Conference Proceedings, pp. 864-870. From: Ground Engineering in a Changing World: 11th Australia - New Zealand Conference on Geomechanics, 15-18 July 2012, Melbourne, VIC, Australia.

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Abstract

An analytical expression incorporating constant rate loading in the determination of consolidation settlements has been summarised. An alternative method to account for time-dependent loading has also been considered, where the total applied load was divided into equal increments which were each applied at known intervals of time using the program Matlab. To establish the decay of excess pore pressure and thus, the percentage consolidation, Terzaghi's original one-dimensional solution was used, whereby the incremental loads were each instantaneously applied, giving rise to small 'initial' uniform distributions in excess pore water pressure. It was found that for increments of time factor less than 0.0143, this discretised approach effectively becomes a constant rate loading problem. The post-construction settlements that were generated using this discretised approach were compared with those generated using the original constant rate loading approach, which was found to be inaccurate for small loading periods. Finally, simple exponential approximations were developed to describe the percentage consolidation that occurs during construction for any period of loading.

Item ID: 23807
Item Type: Conference Item (Refereed Research Paper - E1)
Keywords: clays, consolidation, pore pressures, settlement, theoretical analysis
ISBN: 978-0-646-54301-7
Date Deposited: 05 Nov 2012 02:24
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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