In situ strength characterisation of peat and organic soil using full-flow penetrometers

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Title: In situ strength characterisation of peat and organic soil using full-flow penetrometers
Authors: Boylan, NoelLong, Michael (Michael M.)Mathijssen, F.A.J.M.
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Date: Jul-2011
Online since: 2013-02-26T14:56:28Z
Abstract: Full-flow penetrometers have been shown to overcome problems experienced with the cone penetrometer when measuring resistance in very soft peat and organic soil, and give a much more uniform measure of resistance than the cone in fibrous peat. However, at present there is no guidance on the interpretation of strength parameters in these soils using the T-bar and ball. This paper examines the results of tests using these devices at two research sites in the Netherlands in conjunction with high-quality Sherbrooke sampling for laboratory testing. In fibrous peat, the T-bar and ball provided a more uniform measure of resistance with a lower degree of scatter than the cone. The in situ testing results have been compared with the laboratory tests to assess the range of resistance factors relating penetration resistance to the undrained shear strength (su) and have been shown to occupy a lower range of values than the cone penetrometer. However, penetration tests in these soils are likely to be influenced by partial drainage effects and this should be considered during testing and the subsequent interpretation of results. Recommendations are made for the use of full-flow penetrometers to obtain strength parameters in these soils.
Type of material: Journal Article
Publisher: NRC Research Press
Journal: Canadian Geotechnical Journal
Volume: 48
Issue: 7
Start page: 1085
End page: 1099
Copyright (published version): 2011, NRC Research Press
Keywords: PeatOrganic soilIn situ testingShear strengthFull-flow penetrometers
DOI: 10.1139/t11-023
Language: en
Status of Item: Peer reviewed
ISSN: 0008-3674
Appears in Collections:Civil Engineering Research Collection

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