Modelling Screwpile Installation Using the MPM

Wang, Lei; Coombs, William M.; Augarde, Charles E.; Brown, Michael; Knappett, Jonathan; Brennan, Andrew; Richards, D. J.; Blake, Anthony

doi:10.1016/j.proeng.2017.01.040

Cited by 17 publications

(18 citation statements)

References 8 publications

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“…Numerical techniques enable one to conduct a detail parametric study of screw piles and provide cost-effective, faster solution as compared to the lab tests or field tests. Several numerical techniques have been employed by many researchers 2,[27][28][29][30] to study the behavior of screw piles. Al-Baghdadi et al 27 presented the lateral behavior of screw pile installed in sand using threedimensional finite element analysis considering.…”

Section: Numerical Studymentioning

confidence: 99%

“…Phuong used MPM to study the installation of plain piles. Wang et al 28 considered installation of screw pile using MPM which could be subsequently transferred to standard finite element package for the in-service performance prediction. On the other hand, the discrete element method permits realistic modelling of discrete soil particles by capturing the macroscopic particle contact mechanics.…”

Section: Numerical Studymentioning

confidence: 99%

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ISSPEA 2019: 1st International Symposium on Screw Piles for Energy Applications

Davidson¹,

Brown²,

Knappett³

et al. 2019

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This volume forms the proceedings of the 1st International Symposium on Screw Piles for Energy Applications (ISSPEA), held at the University of Dundee, 27-28 th May, 2019. This conference is the first such event organised at the University of Dundee and was originally designed to be a small event to disseminate the findings of the EPSRC sponsored Supergen WindHub Grand Challenges project: Screw piles for wind energy foundation systems. The impetus to expand the guest list and scope of this event came after discussion with Dr Alan Lutenegger of the University of Massachusetts Amherst who organised the successful 1st International Geotechnical Symposium on Helical Foundations. Unfortunately, the eagerly anticipated 2 nd symposium in this series did not occur as planned so it was decided to partially plug this gap in screw pile innovation reporting by expanding the scope and invitees of ISSPEA. This conference has been organised by the Geotechnical Engineering Research Group at the University of Dundee representing the Screw piles for wind energy foundation systems project partners with academic teams at Durham University and the University of Southampton. The first ISSPEA provides an excellent opportunity for academics, engineers, scientists, practitioners and students to present and exchange the latest developments, experience and findings in screw pile engineering for renewable energy applications. The proceedings contains 12 papers and 9 extended abstracts with the latter representing the presentations made at the event that were not supported by a full paper. The proceedings contain one invited keynote paper from Alan Lutenegger on the current state-of-understanding of the engineering behavior of screw piles and helical anchors. This paper presents an overview of historical applications of screw piles, with discussions on aspects of their design and behaviour which are both understood and in need of further research, using case studies as examples. Other papers in the proceedings look at a variety of topics including: installation requirements and effects; cyclic behaviour; advanced numerical modelling of screw piles, including the use of DEM and MPM to incorporate installation effects into the models; and screw piles used in industrial applications. It is hoped that this proceedings and symposium will lead to similar future meetings and serve as a useful indicator of the current state of innovation and deployment. It is also hoped the event and proceedings will act as the springboard for new lines of research and development and increased use of screw piles for a variety of applications. We are grateful to all the authors and reviewers for their efforts in the preparation of the papers. Finally, the Organisers would like to acknowledge the support and efforts of the Local Organising Committee, paper reviewers and the support of our industrial partners.

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Section: Numerical Studymentioning

confidence: 99%

Section: Numerical Studymentioning

confidence: 99%

ISSPEA 2019: 1st International Symposium on Screw Piles for Energy Applications

Davidson¹,

Brown²,

Knappett³

et al. 2019

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“…The Mohr–Coulomb plasticity model is also widely used in research work, since it allows one to capture the pressure‐dependent strength of a geomaterial with a fraction of costs for sophisticated constitutive models. This exceptional efficiency makes the model a common choice for computationally intensive simulations in geomechanics, such as those involve complex domains, soil‐structure interactions, contacts, large deformations, and/or coupled multiphysics …”

Section: Introductionmentioning

confidence: 99%

Mohr–Coulomb plasticity for sands incorporating density effects without parameter calibration

Choo

2018

Num Anal Meth Geomechanics

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Summary A simple approach is proposed for enabling the conventional Mohr–Coulomb plasticity to capture the effects of relative density on the behavior of dilative sands. The approach exploits Bolton's empirical equations to make friction and dilation angles state variables that depend on the current density and confining pressure. In doing so, the material parameters of Mohr–Coulomb plasticity become void ratios for calculating the initial relative density and the critical state friction angle, all of which are measurable without calibration. A Mohr–Coulomb model enhanced in this way shows good agreement with experimental data of different sands at various densities and confining pressures. In this regard, the proposed approach permits a significant improvement in the conventional Mohr–Coulomb plasticity for sands, without compromising its practical merits.

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“…As part of wider study, we are developing a program based on the MPM to model the soil response to the installation of a screw pile, with the engineering application of providing a computer-aided design tool for engineers to optimise pile design for offshore wind turbine foundations (Wang et al 2017). During installation of a screw pile, the pile is pushed and rotated into the ground.…”

Section: Introductionmentioning

confidence: 99%

On the use of the material point method to model problems involving large rotational deformation

Wang¹,

Coombs²,

Augarde³

et al. 2018

Numerical Methods in Geotechnical Engineering IX

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The Material Point Method (MPM) is a quasi Eulerian-Lagrangian approach to solve solid mechanics problems involving large deformations. In order to improve the stability of the MPM, several extensions have been proposed in the last decade. In these extensions, the sudden change of stiffness when a point crossing an element boundary in the standard MPM is avoided by replacing a material point with a deformable particle domain. The latest extensions are Convected Particle Domain Interpolation approaches, primarily including the CPDI1 and recently published CPDI2. We have unified the standard MPM and CPDI approaches into one implicit computational framework, and here investigate their ability to model problems involving large rotational deformation, which is essential in the installation of screw pile foundations. It was found that the CPDI2 approach can produce erroneous results due to particle domain distortion, while the CPDI1 approach and standard MPM can predict more physically realistic mechanical responses.

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Modelling Screwpile Installation Using the MPM

Cited by 17 publications

References 8 publications

ISSPEA 2019: 1st International Symposium on Screw Piles for Energy Applications

ISSPEA 2019: 1st International Symposium on Screw Piles for Energy Applications

Mohr–Coulomb plasticity for sands incorporating density effects without parameter calibration

On the use of the material point method to model problems involving large rotational deformation

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