Laboratory tests and thermal buckling analysis for pipes buried in Bohai soft clay

Liu, Run; Basu, Prasenjit; Xiong, Hao

doi:10.1016/j.marstruc.2015.05.001

Cited by 56 publications

(25 citation statements)

References 23 publications

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“…(0.5− ) 2 (34) where is the internal pressure of the pipeline, is the pipe's external diameter, is Poisson's ratio, generally equal to 0.3, is the coefficient of linear thermal expansion and is the thickness of the pipeline. The equivalent temperature difference ∆ 1 is generated by internal pressure.…”

Section: The Effect Of Imperfection and Internal Pressurementioning

confidence: 99%

“…Finite-element modelling was employed to investigate the critical upheaval buckling force of buried subsea pipelines [31][32][33] and post-buckling beahviour of unburied subsea pipelines and pipe-in-pipe systems [29,30]. The nonlinear soil resistance model is proposed based on laboratory tests, which is also incorporated in finite element analysis of buried pipelines with different amplitudes of initial geometric imperfections [34]. Using genetic programming, Nazari et al investigated the effect of uncertainty in soil, operating condition and pipe properties on upheaval buckling behaviour of offshore pipeline buried in clayey soil through a two-dimensional finite-element model [35].…”

Section: Introductionmentioning

confidence: 99%

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Localised upheaval buckling of buried subsea pipelines

2018

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Buried subsea pipelines under high temperature conditions tend to relieve their axial compressive force by forming localised upheaval buckles. This phenomenon is traditionally studied as a kind of imperfect column buckling problem. We study upheaval buckling as a genuinely localised buckling phenomenon without making any ad hoc assumptions on the shape of the buckled pipeline. We combine this buckling analysis with a detailed state-of-the-art nonlinear pipe-soil interaction model that accounts for the effect of uplift peak soil resistance for buried pipelines. This allows us to investigate the effect of cover depth of subsea pipelines on their load-deflection behaviour. Furthermore, the influence of axial and uplift peak soil resistance on the localised upheaval behaviour is investigated and the maximum axial compressive stress during the buckling process is discussed. Parameter studies reveal a limit to the temperature difference for safe operation of the pipeline. Localised upheaval buckling may then occur if the pipe is sufficiently imperfect or sufficiently dynamically perturbed.

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Section: The Effect Of Imperfection and Internal Pressurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Localised upheaval buckling of buried subsea pipelines

2018

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“…In more recent years, the finite-element method has been widely used in the investigation of thermal buckling for geometrically imperfect pipelines. Thermal upheaval buckling behaviour of buried pipelines with different amplitudes of initial geometric imperfection was studied by Liu et al [32] through finite-element modelling with a nonlinear soil resistance model incorporated. They found that the critical temperature difference increases with the buried depth and decreases with the amplitude of the initial imperfection.…”

Section: Introductionmentioning

confidence: 99%

Snap behaviour in the upheaval buckling of subsea pipelines under topographic step imperfection

Wang

Heijden

2020

Marine Structures

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Pipelines exposed to high-temperature and high-pressure (HTHP) with a topographic step imperfection are susceptible to the phenomenon of upheaval buckling potentially leading to a hazard for the structural integrity of the pipeline. To analyse this problem we derive analytical upheaval buckling solutions and obtain the locations of maximum displacement and maximum axial compressive stress. We also analyse the typical post-buckling behaviour and its dependence on step height, axial soil resistance and wall thickness. The difference in behaviour between a pipeline with step imperfection and one with a symmetric prop imperfection is discussed. Our results show that a pipeline with a step imperfection is more prone to upheaval buckling than a perfect pipeline. For sufficiently small step heights the pipeline may suffer a snap-back instability under decreasing thermal loading, raising the possibility of hysteretic snap behaviour under cyclic thermal loading (for instance caused by periodic start-ups and shutdowns). The snap-back buckling disappears for large enough step height and the minimum critical temperature difference decreases with increasing step height and wall thickness or with decreasing axial soil resistance. The maximum compressive stress decreases with increasing step height and axial soil resistance or with decreasing wall thickness. A pipeline with step imperfection is safer than one with a symmetric prop imperfection.

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“…Experimental and numerical investigations were carried out to investigate the buckle interaction between propagation buckling and upheaval or lateral buckling in subsea pipelines by Albermani and Karampour [27,28]. Moreover, many finite-element analyses have been performed to investigate lateral and upheaval buckling [29][30][31][32][33][34][35]. All these methods are employed to investigate lateral buckling or vertical buckling behaviour rather than how to control them.…”

Section: Introductionmentioning

confidence: 99%

Analytical study of lateral thermal buckling for subsea pipelines with sleeper

Wang

Tang

Heijden

2018

Thin-Walled Structures

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Unburied subsea pipelines operating under high-temperature and high-pressure conditions tend to relieve their axial compressive force by forming lateral buckles. Uncontrolled lateral buckling may lead to pipeline failure. In order to control lateral buckling, a sleeper is often employed as a buckle-initiation technique. In this study, analytical solutions of lateral buckling for unburied subsea pipelines with sleeper are derived. An energy analysis is employed to investigate the stability of the buckled pipeline. The influence of sleeper height and sleeper friction on pipeline buckled configurations and typical lateral buckling behaviour is illustrated and analysed. The results are shown to be in very good agreement with experimental data in the literature. We also discuss the effect of imperfections and conduct an error analysis of one of the main assumptions of the proposed analytical method. Our results show that increasing the height of the sleeper or decreasing the friction between pipeline and sleeper can all be used to decrease the minimum critical temperature difference. However, only the sleeper height is effective in substantially reducing the maximum compressive stress.

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Laboratory tests and thermal buckling analysis for pipes buried in Bohai soft clay

Cited by 56 publications

References 23 publications

Localised upheaval buckling of buried subsea pipelines

Localised upheaval buckling of buried subsea pipelines

Snap behaviour in the upheaval buckling of subsea pipelines under topographic step imperfection

Analytical study of lateral thermal buckling for subsea pipelines with sleeper

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