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The interpretation of CPT data from hydraulically placed pfa

Stewart, D.I., Cousens, T.W. and Charles-Cruz, C.A. (2006) The interpretation of CPT data from hydraulically placed pfa. Engineering Geology, 85 (1-2). pp. 184-196. ISSN 0013-7952

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Abstract

Cone penetration test (CPT) results on an ~20 year old, hydraulically placed pulverised fuel ash (PFA) deposit are reported, along with the results of oedometer compression tests on ‘undisturbed’ specimens recovered during the site investigation and resedimented PFA samples. The latter showed that aged PFA can undergo significant secondary compression. The correlation between volume compressibility and cone resistance, mv=1/(αqc), is fitted to compressibility data from undisturbed samples to determine α. The resulting CPT compressibility profile shows good agreement with compressibility trends for aged PFA estimated from the tests on resedimented ash. It is therefore recommended that a value of α=11 should be used for normally consolidated, aged PFA. The danger of biased sampling in very loose non-cohesive materials and the need for depth profiling by in situ measurement are highlighted.

Item Type: Article
Copyright, Publisher and Additional Information: © 2006 Elsevier B.V. All rights reserved. This is an author produced version of a paper published in Engineering Geology.
Keywords: Compressibility; Cone penetrometers; CPT; Fly-ash; PFA; Settlement; Silts
Academic Units: The University of Leeds > Faculty of Engineering (Leeds) > School of Civil Engineering (Leeds)
The University of Leeds > Faculty of Engineering (Leeds) > School of Civil Engineering (Leeds) > Inst for Pathogen Control Engineering
Depositing User: Douglas I Stewart
Date Deposited: 21 Jun 2006
Last Modified: 08 Feb 2013 17:02
Published Version: http://dx.doi.org/10.1016/j.enggeo.2005.09.038
Status: Published
Publisher: Elsevier
Refereed: Yes
Identification Number: 10.1016/j.enggeo.2005.09.038
Related URLs:
URI: http://eprints.whiterose.ac.uk/id/eprint/1326

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