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Effects of screw pile installation on installation requirements and in-service performance using the Discrete Element Method

Effects of screw pile installation on installation requirements and in-service performance using the Discrete Element Method
Effects of screw pile installation on installation requirements and in-service performance using the Discrete Element Method
Existing guidance on the installation of screw piles suggest that they should be installed in a pitch-matched manner to avoid disturbance to the soil which may have a detrimental effect on the in-service performance of the pile. Recent insights from centrifuge modelling have shown that installing screw piles in this way requires large vertical compressive (or crowd) forces, which is inconsistent with the common assumption that screw piles pull themselves into the ground requiring minimal vertical compressive force. In this paper, through the use of the Discrete Element Method (DEM), the effects of advancement ratio, i.e. the ratio between the vertical displacement per rotation to the geometric pitch of the helix of the screw pile helix, on the installation resistance and in-service capacity of a screw pile is investigated. The findings are further used to assess the applicability of empirical torque capacity correlation factors for large diameter screw piles. The results of the investigation show that it is possible to reduce the required vertical compressive installation force by 96% by reducing the advancement ratio and that although over-flighting a screw pile can decrease the subsequent compressive capacity, it appears to increase the tensile capacity significantly.
0008-3674
Sharif, Yaseen
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Brown, Michael
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Cerfontaine, Benjamin
0730daf4-9d6b-4f2d-a848-a3fc54505a02
White, David
a986033d-d26d-4419-a3f3-20dc54efce93
Richards, David
a58ea81e-443d-4dab-8d97-55d76a43d57e
Ciantia, Matteo
a96c5e90-142b-4dae-9369-4c6c54d130d0
Davidson, Craig
972704f2-5a32-4469-ad4f-358c60ef8de2
Blake, Anthony
e0438bea-cfc4-4373-b100-8b9768ddc56f
Knappett, Jonathan A.
31949ce8-74c2-49aa-92dd-0b54009d29f3
Brennan, Andrew
ed8e82a5-2c8d-4826-851f-d31cd1c87eb2
Ball, Jonathan David
1baa9903-fa72-4703-ac2c-cdca5498bf8b
Augarde, Charles
c1f68178-6d2e-4b5a-a145-4ee13e039701
Huisman, Marco
fb44d706-adb8-4655-9624-ebfbd6cdf4f4
Ottolini, Marius
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Sharif, Yaseen
f8ed0802-9644-479f-b288-77dec7624aa8
Brown, Michael
4aec31d6-db86-4d2d-98b4-4c52bc30e16d
Cerfontaine, Benjamin
0730daf4-9d6b-4f2d-a848-a3fc54505a02
White, David
a986033d-d26d-4419-a3f3-20dc54efce93
Richards, David
a58ea81e-443d-4dab-8d97-55d76a43d57e
Ciantia, Matteo
a96c5e90-142b-4dae-9369-4c6c54d130d0
Davidson, Craig
972704f2-5a32-4469-ad4f-358c60ef8de2
Blake, Anthony
e0438bea-cfc4-4373-b100-8b9768ddc56f
Knappett, Jonathan A.
31949ce8-74c2-49aa-92dd-0b54009d29f3
Brennan, Andrew
ed8e82a5-2c8d-4826-851f-d31cd1c87eb2
Ball, Jonathan David
1baa9903-fa72-4703-ac2c-cdca5498bf8b
Augarde, Charles
c1f68178-6d2e-4b5a-a145-4ee13e039701
Huisman, Marco
fb44d706-adb8-4655-9624-ebfbd6cdf4f4
Ottolini, Marius
3eccb879-6dbd-4049-96f1-39cffbd9733f

Sharif, Yaseen, Brown, Michael, Cerfontaine, Benjamin, White, David, Richards, David, Ciantia, Matteo, Davidson, Craig, Blake, Anthony, Knappett, Jonathan A., Brennan, Andrew, Ball, Jonathan David, Augarde, Charles, Huisman, Marco and Ottolini, Marius (2020) Effects of screw pile installation on installation requirements and in-service performance using the Discrete Element Method. Canadian Geotechnical Journal, [cgj-2020-0241]. (doi:10.1139/cgj-2020-0241).

Record type: Article

Abstract

Existing guidance on the installation of screw piles suggest that they should be installed in a pitch-matched manner to avoid disturbance to the soil which may have a detrimental effect on the in-service performance of the pile. Recent insights from centrifuge modelling have shown that installing screw piles in this way requires large vertical compressive (or crowd) forces, which is inconsistent with the common assumption that screw piles pull themselves into the ground requiring minimal vertical compressive force. In this paper, through the use of the Discrete Element Method (DEM), the effects of advancement ratio, i.e. the ratio between the vertical displacement per rotation to the geometric pitch of the helix of the screw pile helix, on the installation resistance and in-service capacity of a screw pile is investigated. The findings are further used to assess the applicability of empirical torque capacity correlation factors for large diameter screw piles. The results of the investigation show that it is possible to reduce the required vertical compressive installation force by 96% by reducing the advancement ratio and that although over-flighting a screw pile can decrease the subsequent compressive capacity, it appears to increase the tensile capacity significantly.

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e-pub ahead of print date: 27 October 2020

Identifiers

Local EPrints ID: 450076
URI: http://eprints.soton.ac.uk/id/eprint/450076
ISSN: 0008-3674
PURE UUID: b6bdb9aa-afcd-498f-8165-7aa965365120
ORCID for Benjamin Cerfontaine: ORCID iD orcid.org/0000-0002-4833-9412
ORCID for David White: ORCID iD orcid.org/0000-0002-2968-582X

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Date deposited: 08 Jul 2021 16:31
Last modified: 09 Jul 2021 02:03

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Contributors

Author: Yaseen Sharif
Author: Michael Brown
Author: David White ORCID iD
Author: David Richards
Author: Matteo Ciantia
Author: Craig Davidson
Author: Anthony Blake
Author: Jonathan A. Knappett
Author: Andrew Brennan
Author: Jonathan David Ball
Author: Charles Augarde
Author: Marco Huisman
Author: Marius Ottolini

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