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

Sharif, Y. U. and Brown, M. J. and Cerfontaine, B. and Davidson, C. and Ciantia, M. O. and Knappett, J. and Brennan, A. and Ball, J. D. and Augarde, C. E. and Coombs, W. M. and Blake, A. and Richards, D. and White, D. and Huisman, M. and Ottolini, M. (2021) 'Effects of screw pile installation on installation requirements and in-service performance using the Discrete Element Method.', Canadian geotechnical journal, 58 (9). pp. 1334-1350.

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.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1139/cgj-2020-0241
Date accepted:21 October 2020
Date deposited:23 October 2020
Date of first online publication:27 October 2020
Date first made open access:25 November 2020

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