Calculating cv based on non-uniform initial excess pore pressure

Lovisa, J., Read, W.W., and Sivakugan, N. (2012) Calculating cv based on non-uniform initial excess pore pressure. Géotechnique, 62 (8). pp. 741-748.

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The coefficient of consolidation (c v ) is often determined by comparing the characteristics of the experimental and theoretical consolidation using empirical curve-fitting procedures which are based on the theoretical U−T curve generated by a layer subjected to a uniform initial excess pore water pressure distribution. However, in cases where settlement–time data are a result of a non-uniform initial pore pressure distribution, these curve-fitting procedures are no longer valid. In this technical note, a generalised procedure for Taylor and Casagrande's popular curve-fitting procedures is proposed, where the user is directed to select appropriate adjustment factors, depending on the type of non-uniform initial excess pore pressure distribution encountered. These factors were determined by approximating separate regions of the U−T curves using simple power and exponential functions. In non-uniform cases where the power approximation only captures a small portion of the U−T curve it may be difficult to use the corresponding modified curve-fitting procedure objectively.

Item ID: 22839
Item Type: Article (Research - C1)
ISSN: 0016-8505
Keywords: clays; pore pressures; time dependence; settlement; theoretical analysis; consolidation
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Discussion of this article and author's reply are published in: Lovisa, J. et al (2013). Géotechnique, 63(10), pp. 885-886. Available from the publisher's website in the Related URLs field.

Date Deposited: 13 Aug 2012 01:00
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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