Whole-life geotechnical response of tolerably mobile subsea infrastructure

Michael John Cocjin

doi:10.4225/23/5940d92b700d5

Whole-life geotechnical response of tolerably mobile subsea infrastructure

Michael John Cocjin

Research output: Thesis › Doctoral Thesis

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Abstract

The study explores the novel concept of tolerable mobility of subsea mudmat foundations supporting pipelines as a means to reduce the required mudmat size and weight to meet installation vessel limitations. A comprehensive set of mudmat and pipeline geotechnical centrifuge tests data, supported by a theoretical framework is presented. The study relates mudmat and pipeline behaviour to changes in shear strength of the soil interacting with the infrastructure over the operational life. Key results quantify the increase in mudmat capacity due to repeated shearing and reconsolidation, and the accumulation of settlement and rotation over a typical life cycle of a field, providing insights to assist geotechnical subsea foundation design.

Original language	English
Qualification	Doctor of Philosophy
Awarding Institution	The University of Western Australia
Supervisors/Advisors	Gourvenec, Susan, Supervisor White, David, Supervisor Randolph, Mark, Supervisor
Award date	16 May 2017
DOIs	https://doi.org/10.4225/23/5940d92b700d5
Publication status	Unpublished - 2016

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Cite this

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title = "Whole-life geotechnical response of tolerably mobile subsea infrastructure",

abstract = "The study explores the novel concept of tolerable mobility of subsea mudmat foundations supporting pipelines as a means to reduce the required mudmat size and weight to meet installation vessel limitations. A comprehensive set of mudmat and pipeline geotechnical centrifuge tests data, supported by a theoretical framework is presented. The study relates mudmat and pipeline behaviour to changes in shear strength of the soil interacting with the infrastructure over the operational life. Key results quantify the increase in mudmat capacity due to repeated shearing and reconsolidation, and the accumulation of settlement and rotation over a typical life cycle of a field, providing insights to assist geotechnical subsea foundation design.",

keywords = "Mobile foundation, Soft clay, Oil and gas, Consolidation, Offshore geotechnics, Critical state soil mechanics, Pipeline, Geotechnical centrifuge",

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AB - The study explores the novel concept of tolerable mobility of subsea mudmat foundations supporting pipelines as a means to reduce the required mudmat size and weight to meet installation vessel limitations. A comprehensive set of mudmat and pipeline geotechnical centrifuge tests data, supported by a theoretical framework is presented. The study relates mudmat and pipeline behaviour to changes in shear strength of the soil interacting with the infrastructure over the operational life. Key results quantify the increase in mudmat capacity due to repeated shearing and reconsolidation, and the accumulation of settlement and rotation over a typical life cycle of a field, providing insights to assist geotechnical subsea foundation design.

KW - Mobile foundation

KW - Soft clay

KW - Oil and gas

KW - Consolidation

KW - Offshore geotechnics

KW - Critical state soil mechanics

KW - Pipeline

KW - Geotechnical centrifuge

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DO - 10.4225/23/5940d92b700d5

M3 - Doctoral Thesis

ER -

Whole-life geotechnical response of tolerably mobile subsea infrastructure

Abstract

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