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Shallow penetrometer tests: Theoretical and experimental modelling of the rotation stage

Shallow penetrometer tests: Theoretical and experimental modelling of the rotation stage
Shallow penetrometer tests: Theoretical and experimental modelling of the rotation stage

Shallow penetrometers are a new type of device that measures the properties of surficial offshore sediments via multi-phase tests involving penetration, dissipation, and rotation stages. In fine-grained soils such as silts and clays, these testing stages yield properties relevant to subsea pipeline and shallow foundation design; namely, undrained strength, consolidation, and interface friction. This paper describes the fundamentals of the rotation stage, including models required for data interpretation, encompassing both a total and an effective stress framework. Additionally, new relationships to evaluate the pore pressure scaling factor, which is a key interpretation parameter required to convert discrete measurements of pore pressure on the penetrometers to an average pore pressure over the contact area, are developed based on large-deformation finite element simulations. Results from an experimental campaign using kaolin clay samples are presented, illustrating the potential of the devices to rapidly and repeatably measure interface friction properties of fine-grained sediments offshore. The results compare well with comparative measures obtained from shear box tests conducted at similarly low effective stress levels. Recommendations regarding future in situ applications are given at end of the paper.

Shallow penetrometer; offshore engineering; in-situ testing; axial sliding resistance; pipe-soil interaction
0008-3674
580-594
Schneider, M.A.
2cadaf19-6be4-4d1f-b33d-c68aec2a2f92
Stanier, Samuel A.
b11049bd-44ee-4db9-9e66-a5ea20a3c70b
White, David
a986033d-d26d-4419-a3f3-20dc54efce93
Randolph, Mark
05c8dec9-cf94-42ef-8b4c-82bce017c82a
Schneider, M.A.
2cadaf19-6be4-4d1f-b33d-c68aec2a2f92
Stanier, Samuel A.
b11049bd-44ee-4db9-9e66-a5ea20a3c70b
White, David
a986033d-d26d-4419-a3f3-20dc54efce93
Randolph, Mark
05c8dec9-cf94-42ef-8b4c-82bce017c82a

Schneider, M.A., Stanier, Samuel A., White, David and Randolph, Mark (2020) Shallow penetrometer tests: Theoretical and experimental modelling of the rotation stage. Canadian Geotechnical Journal, 57 (4), 580-594. (doi:10.1139/cgj-2018-0657).

Record type: Article

Abstract

Shallow penetrometers are a new type of device that measures the properties of surficial offshore sediments via multi-phase tests involving penetration, dissipation, and rotation stages. In fine-grained soils such as silts and clays, these testing stages yield properties relevant to subsea pipeline and shallow foundation design; namely, undrained strength, consolidation, and interface friction. This paper describes the fundamentals of the rotation stage, including models required for data interpretation, encompassing both a total and an effective stress framework. Additionally, new relationships to evaluate the pore pressure scaling factor, which is a key interpretation parameter required to convert discrete measurements of pore pressure on the penetrometers to an average pore pressure over the contact area, are developed based on large-deformation finite element simulations. Results from an experimental campaign using kaolin clay samples are presented, illustrating the potential of the devices to rapidly and repeatably measure interface friction properties of fine-grained sediments offshore. The results compare well with comparative measures obtained from shear box tests conducted at similarly low effective stress levels. Recommendations regarding future in situ applications are given at end of the paper.

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Schneider et al 2019 AM - Accepted Manuscript
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Accepted/In Press date: 3 July 2019
e-pub ahead of print date: 16 September 2019
Published date: April 2020
Additional Information: Funding Information: The research presented here forms part of the activities of the Centre for Offshore Foundation Systems (COFS), currently supported as a node of the Australian Research Council (ARC) Centre of Excellence for Geotechnical Science and Engineering (CE110001009). The first author is grateful for the support provided by an International Postgraduate Research Scholarship (IPRS) from the Australian Government. The second author was supported by an ARC DECRA Fellowship (DE170100119). Additionally, the work was supported by the Remote Intelligent Geotechnical Surveys (RIGSS) Joint Industry Project, with the participants Benthic Geotech, Fugro, Shell, Total, and Woodside Energy. Publisher Copyright: © 2020, Canadian Science Publishing. All rights reserved.
Keywords: Shallow penetrometer; offshore engineering; in-situ testing; axial sliding resistance; pipe-soil interaction

Identifiers

Local EPrints ID: 439476
URI: http://eprints.soton.ac.uk/id/eprint/439476
ISSN: 0008-3674
PURE UUID: 9f68fce4-ba34-4424-bbac-f38edb16ce98
ORCID for David White: ORCID iD orcid.org/0000-0002-2968-582X

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Date deposited: 24 Apr 2020 16:30
Last modified: 23 Sep 2022 01:51

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Contributors

Author: M.A. Schneider
Author: Samuel A. Stanier
Author: David White ORCID iD
Author: Mark Randolph

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