Consolidation around partially embedded seabed pipelines

Krost, K; Gourvenec, Susan; White, David

doi:10.1680/geot.8.t.015

Cited by 34 publications

(27 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This contrast in the fsu parameter between surface foundations and pipelines is perhaps due to the additional normal stress applied to the surrounding soil by the 'wedging' effect (Krost et al, 2011) caused by the curved pipeline surface. This additional loading creates a greater rise in soil strength than the purely vertical load applied by a surface foundation.…”

Section: Simplified General Relationships For Consolidated Breakout Rmentioning

confidence: 99%

“…Gourvenec and White (2010) and Krost et al (2011) presented elastic solutions of the consolidation response which indicated the extent and longevity of the excess pore pressures around a pipeline but the elastic soil model used in the analyses precluded assessment of the subsequent resistance. Chatterjee et al (2012b) performed elasto-plastic finite element analysis using the modified Cam clay constitutive model to study consolidation rates around pipelines and these analyses were extended by Chatterjee et al (2013) to examine the changes in bearing capacity for consolidation under a load equal to the initial undrained bearing capacity.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Assessment of the consolidated breakout response of partially embedded subsea pipelines

Chatterjee¹,

Gourvenec²,

White³

2014

Géotechnique

Self Cite

View full text Add to dashboard Cite

The changing soil strength due to consolidation around a subsea pipeline can alter the lateral breakout resistance. Results of elasto-plastic coupled consolidation finite element analyses are presented that quantify the effect of consolidation on the undrained breakout resistance and trajectory of partially embedded seabed pipelines. Breakout resistance is presented in terms of failure envelopes in vertical-horizontal load space, which also allow the trajectory of the pipe during breakout to be determined by normality. Observed responses for consolidated undrained breakout are described by simple algebraic expressions as a function of initial pipe embedment, pipe self-weight (and consequent consolidation pressure) and breakout load path.Consolidation and the associated enhancement of the shear strength of the surrounding soil can have a significant effect on the breakout response. The assumption in current practice of unconsolidated undrained soil behaviour may lead to underestimation of pipeline breakout resistance and inaccurate prediction of the trajectory of the pipe during breakout.

show abstract

Section: Simplified General Relationships For Consolidated Breakout Rmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assessment of the consolidated breakout response of partially embedded subsea pipelines

Chatterjee¹,

Gourvenec²,

White³

2014

Géotechnique

Self Cite

View full text Add to dashboard Cite

show abstract

“…Previous efforts in the literature to model coupled consolidation behaviour under partially embedded pipes have mainly been limited to small-strain elastic solutions (Gourvenec and White 2010;Krost et al 2011). The prediction of pore-water pressure dissipation assuming the soil to be elastic can be reasonably accurate.…”

Section: Introductionmentioning

confidence: 99%

Coupled consolidation analysis of pipe–soil interactions

2013

View full text Add to dashboard Cite

Current design practice for pipe-seabed interaction in soft soils is generally based on the assumption of undrained behaviour throughout laying and subsequent operation. In reality, drainage and consolidation around a partially embedded pipe can have a marked effect on the vertical penetration and horizontal breakout resistance. In this paper, a large-deformation finite element methodology coupled with the "modified Cam clay" plasticity soil model has been developed to study the coupled consolidation behaviour of soil around partially embedded seabed pipelines. Simulations of penetration show that after laying, subsequent consolidation leads to further embedment by an amount dependent on the level of drainage that occurred during laying. Also, if the pipe is embedded under undrained conditions, the waiting period between laying and operation allows the soil around the pipe to consolidate under the pipe self-weight. The consolidation process results in an increase in the strength of the soil. The lateral breakout resistance and the direction of pipe movement on breakout thus depend on the consolidated strength of the soil around the pipe, as well as the applied loading. The envelopes of vertical-lateral combined loading bearing capacity differ markedly from those predicted assuming undrained behaviour throughout.Résumé : La pratique courante de conception de l'interaction tuyau-fond marin est généralement basée sur l'hypothèse d'un comportement non drainé durant le placement et durant l'opération subséquente. En réalité, le drainage et la consolidation autour d'un tuyau partiellement enfoui peut avoir un effet marqué sur la pénétration verticale et la résistance horizontale à la séparation. Dans cet article, une méthodologie par éléments finis à grande déformation couplée avec le modèle de plasticité du sol « Cam clay modifié » a été développée pour étudier le comportement couplé en consolidation du sol autour de tuyaux partiellement enfouis dans le fond marin. Des simulations de pénétration montrent que suite à la déposition, la consolidation subséquente entraîne un enfouissement supplémentaire dépendamment du niveau de drainage s'étant produit durant la déposition. De plus, si le tuyau est enfoui en conditions non drainées, la période d'attente entre la déposition et l'opération permet au sol autour du tuyau de consolider sous le poids du tuyau. Le processus de consolidation résulte en une augmentation de la résistance du sol. La résistance à la séparation latérale et la direction du mouvement du tuyau lors de la séparation dépendent ainsi de la résistance à la consolidation du sol autour du tuyau, de même que sur la charge appliquée. Les enveloppes de capacité portante en sollicitations verticales-latérales combinées diffèrent de façon marquée de celles prédites en supposant un comportement non drainé. [Traduit par la Rédaction]

show abstract

“…However, a poroelastic model, with the assumption of linear elasticity, is the common starting point for many (if not most) closed form solutions for consolidation problems. They have been shown to give good approximations for the consolidation behaviour (see for example Randolph andWroth, 1979 andKrost et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Analytical Solution for the Consolidation around a Laterally Loaded Pile

Osman

Randolph

2012

Int. J. Geomech.

View full text Add to dashboard Cite

The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. ABSTRACTThis paper presents a closed-form analytical solution for the consolidation of the soil around a laterally loaded pile, assuming the soil skeleton deforms elastically and under plane strain conditions. The problem is idealised as a circular rigid disc surrounded by a deformable soil zone. Expressions for the initial excess pore water pressure distribution are derived from the mean total stress changes given by the elastic solution. Curves showing decay of the excess pore water pressure with time, and also the variation of pile displacement, are plotted in non-dimensional form. The parameters that affect the displacement prediction are illustrated and discussed.

show abstract

Consolidation around partially embedded seabed pipelines

Cited by 34 publications

References 14 publications

Assessment of the consolidated breakout response of partially embedded subsea pipelines

Assessment of the consolidated breakout response of partially embedded subsea pipelines

Coupled consolidation analysis of pipe–soil interactions

Analytical Solution for the Consolidation around a Laterally Loaded Pile

Contact Info

Product

Resources

About