Unsaturated soil dynamics: Finite element solution including stress-induced anisotropy

Ghorbani, Javad; Airey, David; Carter, John; Nazem, Majidreza

doi:10.1016/j.compgeo.2021.104062

Cited by 26 publications

(3 citation statements)

References 62 publications

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“…It is worth noting that the analysis assumed that no pore water pressure is generated in soils, i.e., the soil is idealised as a single-phase material. The assumption may lead to inaccuracy if liquefaction or other failure mechanisms induced by pore water pressure are important [42,43]. To avoid complexities, the model considers that the flow rule and softening/hardening are independent of stress-induced anisotropy and the magnitude of confining pressure.…”

Section: Pipeline Failure Criteriamentioning

confidence: 99%

The Role of Soil Structure Interaction in the Fragility Assessment of HP/HT Unburied Subsea Pipelines

Forcellini

Mina

Karampour

2022

JMSE

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Subsea high pressure/high temperature (HP/HT) pipelines may be significantly affected by the effects of soil structure interaction (SSI) when subjected to earthquakes. Numerical simulations are herein applied to assess the role of soil deformability on the seismic vulnerability of an unburied pipeline. Overcoming most of the contributions existing in the literature, this paper proposes a comprehensive 3D model of the system (soil + pipeline) by performing OpenSees that allows the representation of non-linear mechanisms of the soil and may realistically assess the induced damage caused by the mutual interaction of buckling and seismic loads. Analytical fragility curves are herein derived to evaluate the role of soil structure interaction in the assessment of the vulnerability of a benchmark HP/HT unburied subsea pipeline. The probability of exceeding selected limit states was based on the definition of credited failure criteria.

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Section: Pipeline Failure Criteriamentioning

confidence: 99%

The Role of Soil Structure Interaction in the Fragility Assessment of HP/HT Unburied Subsea Pipelines

Forcellini

Mina

Karampour

2022

JMSE

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“…In this paper, a recently developed soil model for unsaturated soils termed MUD (Model for Unsaturated soil Dynamics) (Ghorbani et al, 2021a) will be used. MUD eliminates the need to enforce the consistency conditions at the end of the integration process; a feature that simplifies the stress integration algorithm (Ghorbani et al, 2021a). This is obtained by eliminating the purely elastic region and defining a loading surface on which the stress state is always located.…”

Section: Constitutive Modelmentioning

confidence: 99%

Improving Efficiency, Stability, and Accuracy of Finite Element Solutions for Solving Dynamic Contact Problems Involving Unsaturated Soils

Ghorbani

Chen

Kodikara

et al. 2022

Challenges and Innovations in Geomechanics

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The paper investigates the efficiency, stability, and accuracy of finite element solutions based on the mortar approach in solving dynamic contact problems that involve unsaturated soils. We employ a fully coupled finite element solution and a recently developed bounding surface model for describing the hydro-mechanical hysteresis of unsaturated soils. The paper discusses a key source of instability in numerical simulations of this class of problems which is stress overshooting. We evaluate the efficiency of a solution for this problem and discuss the impact of this solution on improving the accuracy and stability of numerical simulations. Numerical simulations are presented for verification and analysis of efficiency, stability, and accuracy.

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“…By defining equation(4) as a setof equationsarising from displacements, pore water pressure, and suction as primary variables, the dynamic response of unsaturated soil can be described as [9,8]…”

Section: General Specificationsmentioning

confidence: 99%

Elastoplastic indentation of unsaturated soils using a rigid cylinder

Ghorbani¹,

Kodikara²

2021

9th Edition of the International Conference on Computational Methods for Coupled Problems in Science and Engineering

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We develop a fully coupled finite element solution for elastoplastic indentations of unsaturated granular soils by a rigid cylinder by using a mortar-type contact algorithm. In the presented solution, we have employed an advanced constitutive model that allows the inclusion of the effect of matric suction and induced anisotropy in the problem. Several numerical examples in both static and dynamic scenarios are provided for validation and demonstrating the capabilities of the presented framework.

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Unsaturated soil dynamics: Finite element solution including stress-induced anisotropy

Cited by 26 publications

References 62 publications

The Role of Soil Structure Interaction in the Fragility Assessment of HP/HT Unburied Subsea Pipelines

The Role of Soil Structure Interaction in the Fragility Assessment of HP/HT Unburied Subsea Pipelines

Improving Efficiency, Stability, and Accuracy of Finite Element Solutions for Solving Dynamic Contact Problems Involving Unsaturated Soils

Elastoplastic indentation of unsaturated soils using a rigid cylinder

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