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Numerical simulations of the load on an embedded anchor from a taut mooring system

Numerical simulations of the load on an embedded anchor from a taut mooring system
Numerical simulations of the load on an embedded anchor from a taut mooring system

With the oil and gas exploration stepping into deeper water, taut mooring systems have become a popular solution for station keeping. However, the inclination angle at the anchor point in a taut mooring system may reach up to 40 degree from horizontal, which brings significant uplift load to the offshore foundation. In this scenario, embedded anchors, such as suction anchor, dynamically-embedded plate/torpedo anchor and drag anchors, are always employed to provide adequate holding capacity. The pad-eye of these anchors is designed at a certain depth into the mudline, which causes interaction between the soil and the embedded mooring line. The interaction is complex and introduces challenges in predicting the mooring load acting on the anchor. The present study proposes a dynamic method to predict anchor load caused by the motion of the floating platform. Soil resistance is calculated instantaneously by a simple and robust model. Based on the proposed method, sensitivity studies were conducted to investigate the influence of the oscillation amplitude and period on the anchor load. It is concluded that the maximum anchor load is more sensitive to the oscillation amplitude rather than the period, meaning that for the conditions considered, a dynamic analysis is not required.

Anchor load, Chain and soil interaction, Lumped mass method, Mooring line dynamics
691-696
International Society of Offshore and Polar Engineers
Xiong, Lingzhi
699c8580-1ee4-4bcb-b2ca-2e6dabf9bc9c
Zhao, Wenhua
26bfd8b2-ebe7-4f75-be51-e363bb83636c
Yang, Jianmin
25c1532a-4f28-4d72-aef9-f0686616bf95
White, David
a986033d-d26d-4419-a3f3-20dc54efce93
Xiong, Lingzhi
699c8580-1ee4-4bcb-b2ca-2e6dabf9bc9c
Zhao, Wenhua
26bfd8b2-ebe7-4f75-be51-e363bb83636c
Yang, Jianmin
25c1532a-4f28-4d72-aef9-f0686616bf95
White, David
a986033d-d26d-4419-a3f3-20dc54efce93

Xiong, Lingzhi, Zhao, Wenhua, Yang, Jianmin and White, David (2016) Numerical simulations of the load on an embedded anchor from a taut mooring system. In Proceedings of the 26th International Ocean and Polar Engineering Conference, ISOPE 2016. vol. 2016-January, International Society of Offshore and Polar Engineers. pp. 691-696 .

Record type: Conference or Workshop Item (Paper)

Abstract

With the oil and gas exploration stepping into deeper water, taut mooring systems have become a popular solution for station keeping. However, the inclination angle at the anchor point in a taut mooring system may reach up to 40 degree from horizontal, which brings significant uplift load to the offshore foundation. In this scenario, embedded anchors, such as suction anchor, dynamically-embedded plate/torpedo anchor and drag anchors, are always employed to provide adequate holding capacity. The pad-eye of these anchors is designed at a certain depth into the mudline, which causes interaction between the soil and the embedded mooring line. The interaction is complex and introduces challenges in predicting the mooring load acting on the anchor. The present study proposes a dynamic method to predict anchor load caused by the motion of the floating platform. Soil resistance is calculated instantaneously by a simple and robust model. Based on the proposed method, sensitivity studies were conducted to investigate the influence of the oscillation amplitude and period on the anchor load. It is concluded that the maximum anchor load is more sensitive to the oscillation amplitude rather than the period, meaning that for the conditions considered, a dynamic analysis is not required.

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More information

Published date: 2016
Venue - Dates: 26th Annual International Ocean and Polar Engineering Conference, ISOPE 2016, , Rhodes, Greece, 2016-06-25 - 2016-06-30
Keywords: Anchor load, Chain and soil interaction, Lumped mass method, Mooring line dynamics

Identifiers

Local EPrints ID: 419394
URI: http://eprints.soton.ac.uk/id/eprint/419394
PURE UUID: 5b834e22-19ec-424e-bb21-1e6f98ebc4ae
ORCID for David White: ORCID iD orcid.org/0000-0002-2968-582X

Catalogue record

Date deposited: 11 Apr 2018 16:30
Last modified: 09 Jan 2022 03:59

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Contributors

Author: Lingzhi Xiong
Author: Wenhua Zhao
Author: Jianmin Yang
Author: David White ORCID iD

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