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Experiments using a novel penetrometer to assess changing strength of clay during remolding and reconsolidation

Experiments using a novel penetrometer to assess changing strength of clay during remolding and reconsolidation
Experiments using a novel penetrometer to assess changing strength of clay during remolding and reconsolidation

The process of remolding and subsequent recovery of soil shear strength is a common geotechnical problem, especially in the offshore environment, where foundations and pipelines are subjected to intermittent operational and environmental loads. A novel vertically oriented penetrometer (VOP) was used in a centrifuge testing program to study the changing strength of normally consolidated kaolin from successive disturbance and reconsolidation events. The VOP is used to determine soil shear strength via an interpretation akin to the laterally loaded pile. The test series involved cyclic movement of the VOP at velocities ranging from 0.3 to 3 mm/s, with a corresponding 100-fold variation in the duration of each cycle. For the VOP tests at low velocities with high cyclic periods, the soil resistance initially reduces, but then shows an increase that scales with the elapsed time, indicating reconsolidation. Ultimately, if the cycling continues for sufficient time, the recovery in strength from reconsolidation can exceed the weakening from remolding. A previously published framework using critical-state soil mechanics concepts is shown to capture the changing resistance well.

1090-0241
Sahdi, Fauzan
4440c2e1-cec9-4cbf-b101-7722b9535ea5
White, David J.
a986033d-d26d-4419-a3f3-20dc54efce93
Gaudin, Christophe
fb56af7b-bc67-429c-a507-d26249fba84d
Sahdi, Fauzan
4440c2e1-cec9-4cbf-b101-7722b9535ea5
White, David J.
a986033d-d26d-4419-a3f3-20dc54efce93
Gaudin, Christophe
fb56af7b-bc67-429c-a507-d26249fba84d

Sahdi, Fauzan, White, David J. and Gaudin, Christophe (2017) Experiments using a novel penetrometer to assess changing strength of clay during remolding and reconsolidation. Journal of Geotechnical and Geoenvironmental Engineering, 143 (4), [06016030]. (doi:10.1061/(ASCE)GT.1943-5606.0001637).

Record type: Article

Abstract

The process of remolding and subsequent recovery of soil shear strength is a common geotechnical problem, especially in the offshore environment, where foundations and pipelines are subjected to intermittent operational and environmental loads. A novel vertically oriented penetrometer (VOP) was used in a centrifuge testing program to study the changing strength of normally consolidated kaolin from successive disturbance and reconsolidation events. The VOP is used to determine soil shear strength via an interpretation akin to the laterally loaded pile. The test series involved cyclic movement of the VOP at velocities ranging from 0.3 to 3 mm/s, with a corresponding 100-fold variation in the duration of each cycle. For the VOP tests at low velocities with high cyclic periods, the soil resistance initially reduces, but then shows an increase that scales with the elapsed time, indicating reconsolidation. Ultimately, if the cycling continues for sufficient time, the recovery in strength from reconsolidation can exceed the weakening from remolding. A previously published framework using critical-state soil mechanics concepts is shown to capture the changing resistance well.

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More information

Accepted/In Press date: 23 August 2016
e-pub ahead of print date: 16 November 2016
Published date: 1 April 2017

Identifiers

Local EPrints ID: 419396
URI: http://eprints.soton.ac.uk/id/eprint/419396
ISSN: 1090-0241
PURE UUID: 7854bf1a-8a76-4ca9-b606-86ce7c0f74c7
ORCID for David J. White: ORCID iD orcid.org/0000-0002-2968-582X

Catalogue record

Date deposited: 11 Apr 2018 16:30
Last modified: 28 Apr 2022 02:20

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Contributors

Author: Fauzan Sahdi
Author: David J. White ORCID iD
Author: Christophe Gaudin

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