Generalized predictive framework for lateral break-out resistance of submarine pipelines considering nonlinear seabed geometry and consolidation

Ghorai, Bithin; Chatterjee, Santiram; Gourvenec, Susan

doi:10.1016/j.apor.2021.102932

Cited by 3 publications

(4 citation statements)

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“…This can be represented by a single spring and slider as for a single element (or a family of springs and sliders known as Iwan elements [42]), but with stress or displacement as input to the system and a fixed boundary at the other end. The general lumped element (or macro-element) approach has been applied for a range of boundary value problems including shallow foundations [43][44][45], pipelines [46,47] and penetrometers [24]. The lumped element can be described as a formal constitutive model (e.g.…”

Section: 'Lumped' and 'Layered' Systems; Spring And Slider Analogsmentioning

confidence: 99%

“…These relationships can themselves include time-dependent changes in strength following critical state principles (e.g. [24,43,[45][46][47]).…”

Section: 'Lumped' and 'Layered' Systems; Spring And Slider Analogsmentioning

confidence: 99%

“…The lumped element critical state model outlined above [43] has also been extended to predict lateral break out resistance of submarine pipelines following installation- induced vertical preloading and consolidation [46], most recently incorporating the effects of large displacement during installation [47]. The macro-model was calibrated against a suite of parametric finite element analyses [46,47] using a Modified Cam Clay constitutive model. Figure 23 shows the potential increased lateral break out resistance with increasing levels of preload and consolidation (difference between the inner pink yield envelope and the outer envelopes).…”

Section: Consolidated Undrained Lateral Breakout Of a Pipelinementioning

confidence: 99%

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Whole Life Design: Theory and Applications of This New Approach to Offshore Geotechnics

Gourvenec

2022

Indian Geotech J

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Geotechnical properties can evolve throughout the design life of a structure due to actions imposed during installation, the operational life or late and end of life management of an asset. Whole life geotechnical design seeks to predict soil-structure responses across the design life by considering the whole life of imposed actions coupled with geotechnical properties that evolve with each action. In contrast, traditional geotechnical design considers the ‘worst case’ single value of minimum resistance or stiffness coupled with the ‘worst case’ single value of maximum action over the design life. The emerging philosophy of whole life geotechnical design checks limit states at different stages of the ‘whole life’ against ‘current’ geotechnical properties, updated based on the processes that have occurred and the responses that have accumulated earlier in the design life. Consideration of whole life geotechnical response provides greater insight, enabling forecasting of the response of a supported structure through and beyond its design life. Insights can be applied at the initial design stage for optimal sizing; through life for assessing or predicting cumulative displacements or changes in resistance, and assumptions in the initial design against observed performance. By extension, these insights can be used to predict actual remaining design life; for re-lifing or re-purposing; and decommissioning. This paper presents the overarching philosophy of whole life geotechnical design, theory underpinning the evolution of geotechnical properties, derivation of the appropriate parameters, and some applications. This paper demonstrates the potential of whole life design, particularly to the emerging opportunities of offshore renewable energy infrastructure.

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Section: 'Lumped' and 'Layered' Systems; Spring And Slider Analogsmentioning

confidence: 99%

“…These relationships can themselves include time-dependent changes in strength following critical state principles (e.g. [24,43,[45][46][47]).…”

Section: 'Lumped' and 'Layered' Systems; Spring And Slider Analogsmentioning

confidence: 99%

Section: Consolidated Undrained Lateral Breakout Of a Pipelinementioning

confidence: 99%

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Whole Life Design: Theory and Applications of This New Approach to Offshore Geotechnics

Gourvenec

2022

Indian Geotech J

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“…Ai et al [21] studied the response of a free-span direction pipeline to VIVs, and they provided a response model of pipeline vibration using the Hamilton principle. For the safety of buried pipelines in marine engineering, Ghorai et al [22] studied the lateral break-out resistance of a buried pipeline by considering the changes in seabed geometry due to the pipeline's installation. Yang et al [23] experimented with the response of a shallowly buried pipeline to the hydrodynamic forces induced by waves; they found that the horizontal hydrodynamic force was as important as the vertical force, to some degree, and they determined that hydrodynamic forces should be taken into account in engineering.…”

Section: Introductionmentioning

confidence: 99%

Modal Analysis of the Hydrodynamic Force of a Capsule in a Hydraulic Capsule Pipeline

Zhao,

Li,

Sun

2023

JMSE

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Hydrodynamic forces influence the efficiency and safety of pipeline transport in ocean engineering. A capsule pipeline is an example of pipeline transportation. In this work, a dynamic model is proposed to explain the oscillating motion of a capsule in a hydraulic capsule pipeline (HCP). The main study was conducted using a modal analysis of hydrodynamic forces acting on a capsule, which could be divided into frictional drag and pressure drag forces. The results indicated the presence of independent modes with different contributions to the hydrodynamic forces. Ultimately, the first to fiftieth modes represented 94~97.3% of the hydrodynamic force contributions. These modes had their own frequency ranges and power spectrum density (PSD) functions, and the frictional drag and pressure drag were both found to coincide with the narrow-band characteristics of the lower-order modes. However, the PSD functions of the frictional drag were found to fulfill the wide-band characteristics corresponding to the higher-order modes. Then, coherent structures were extracted. As the mode order increased, the vortices became more fragile and the frequency became higher. This phenomenon coincided with an increase in the frequency of the time coefficient peak, which became larger. This work could provide new perspectives on the hydrodynamic forces of pipeline transport, especially its dynamic analysis of the interaction between a rigid capsule and fluid flow.

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A two-dimensional effective stress framework for modelling whole-life soil strength changes due to pore pressure generation and dissipation, Part 2: Applications

Wang,

O'Loughlin,

Zhou

et al. 2023

Can. Geotech. J.

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Accurate quantification of the temporal changes in seabed strength allows for more reliable and less conservative geotechnical design. A recently developed effective stress framework, established within a one-dimensional computational domain to quantify changes in soil strength due to pore pressure generation and dissipation, has been extended to a two-dimensional (2D) computational domain to allow for consideration of boundary value problems that are too complex to be simplified to one-dimensional conditions. The work to implement the 2D framework is reported across two companion papers. The first of the two papers utilises large deformation finite element analyses to quantify the spatial distribution of accumulated plastic shear strain. These distributions are encapsulated within a strain influence function that is used within the new 2D framework in this paper to calculate the extent and magnitude of excess pore pressure, and in turn the mobilised soil strength for a number of boundary value problems that represent typical offshore geotechnical processes. The merit of the new 2D framework is explored via retrospective simulations of existing experimental and numerical data. The resulting comparisons demonstrate the potential of the new framework, which is in quantifying the reliability of a range of geotechnical structures under complex loading conditions.

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Generalized predictive framework for lateral break-out resistance of submarine pipelines considering nonlinear seabed geometry and consolidation

Cited by 3 publications

References 31 publications

Whole Life Design: Theory and Applications of This New Approach to Offshore Geotechnics

Whole Life Design: Theory and Applications of This New Approach to Offshore Geotechnics

Modal Analysis of the Hydrodynamic Force of a Capsule in a Hydraulic Capsule Pipeline

A two-dimensional effective stress framework for modelling whole-life soil strength changes due to pore pressure generation and dissipation, Part 2: Applications

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