An operator’s perspective on offshore risk assessment and geotechnical design in geohazard-prone areas

Jeanjean, Philippe; Clukey, Edward C.; Hampson, Kevin M.; Evans, Trevor; Liedtke, Eric

doi:10.1201/noe0415390637.ch6

Cited by 34 publications

(18 citation statements)

References 2 publications

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“…Bryn et al, 2004;Jeanjean et al, 2005). In shallow water, mudflows initiated by hydrodynamic action can also impact on pipelines (Swanson & Jones, 1982;Gilbert et al, 2007).…”

Section: Submarine Slide Impactmentioning

confidence: 96%

The mechanism of steady friction between seabed pipelines and clay soils

White

Dingle²

2011

Géotechnique

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The large-amplitude lateral soil resistance between an on-bottom pipeline and the seabed is an important design parameter in assessing pipeline behaviour during lateral thermal buckling or under the impact of a submarine slide. This paper describes a series of centrifuge model tests that shed light on the underlying behaviour during large-amplitude lateral pipe movement. It is shown that at large displacements the lateral response is governed predominantly by the passive resistance of the growing berm of soil ahead of the pipe. Using a new analysis of this growing soil berm, based on conservation of volume, the 'local' embedment of the pipe relative to the top of the idealised soil berm is defined. In this way, the normalised lateral pipe-soil resistance, H/s u D, from tests encompassing a range of pipe weights and initial embedments follows a single trend line. This idealisation of the response is more consistent than the usual terminology of a pipe-soil friction factor.

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“…Bryn et al, 2004;Jeanjean et al, 2005). In shallow water, mudflows initiated by hydrodynamic action can also impact on pipelines (Swanson & Jones, 1982;Gilbert et al, 2007).…”

Section: Submarine Slide Impactmentioning

confidence: 96%

The mechanism of steady friction between seabed pipelines and clay soils

White

Dingle²

2011

Géotechnique

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“…Compared with subaerial slides, submarine slides have greater mobility, with run-out distances of more than 100 km (Locat & Lee, 2002), and involve larger volumes of failed material. As a result, they pose serious threats to the safety of nearby pipelines, as illustrated by Jeanjean et al (2005).…”

Section: Introductionmentioning

confidence: 99%

Centrifuge modelling of active slide–pipeline loading in soft clay

Sahdi¹,

Gaudin²,

White³

et al. 2014

Géotechnique

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Submarine slides are a significant hazard to the safe operation of pipelines in the proximity of continental slopes. This paper describes the results of a centrifuge testing programme aimed at studying the impact forces exerted by a submarine slide on an offshore pipeline. This was achieved by dragging a model pipe at varying velocities through fine-grained soil at various degrees of consolidation, hence exhibiting properties spanning from the fluid to the geotechnical domains, relevant to the state of submarine slide material. To simulate the high strain rates experienced by the soil while flowing around a pipe in the path of a submarine slide, tests were conducted at pipe-soil velocities of up to 4 . 2 m/s. The changing density and shear strength of the samples were back-calculated from T-bar penetrometer test results. A hybrid approach combining geotechnical and fluid-mechanics-based components of horizontal drag resistance was developed. This approach provides an improved method to link the density and strength of the slide material to the force applied on the pipe. Besides fitting the present observations, the method provides an improved reinterpretation of similar data from the literature.

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“…Pipelines, particularly export trunklines that carry hydrocarbon products from offshore production areas to onshore processing facilities, are the most exposed to impact risk from submarine slides because of their excessive length and varied terrain conditions they often encounter. To ensure the safe operation of submarine pipelines, it is important to assess the impact forces from submarine slides on pipelines (Jeanjean et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Impact forces of submarine landslides on offshore pipelines

Tian

2015

Ocean Engineering

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An operator’s perspective on offshore risk assessment and geotechnical design in geohazard-prone areas

Cited by 34 publications

References 2 publications

The mechanism of steady friction between seabed pipelines and clay soils

The mechanism of steady friction between seabed pipelines and clay soils

Centrifuge modelling of active slide–pipeline loading in soft clay

Impact forces of submarine landslides on offshore pipelines

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