Boulder-soil-pile dynamic interaction

Holeyman, Alain; Peralta, Proserpine; Charue, Nicolas

doi:10.1201/b18442-72

Cited by 7 publications

(3 citation statements)

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“…This concept is not rare in the literature. A similar study was conducted by Holeyman et al [41] where a Boulder-soil-pile model was simulated using 1-D wave equation theory to study soil and boulder failure mechanisms. The goal of the following model is to study the buckling propagation in a pile with further penetration in the soil after it hits the boulder.…”

Section: Scenario 4: Heterogeneous Soilmentioning

confidence: 98%

Numerical evaluation of buckling in steel pipe piles during vibratory installation

Bakroon

Daryaei

Aubram

et al. 2019

Soil Dynamics and Earthquake Engineering

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The buckling of steel pipe piles during installation is numerically studied. Generally, numerical simulation of installation processes is challenging due to large soil deformations. However, by using advanced numerical approaches like Multi-Material Arbitrary Lagrangian-Eulerian (MMALE), such difficulties are mitigated. The Mohr-Coulomb and an elastic-perfectly plastic material model is used for the soil and pile respectively. The pile buckling behavior is verified using analytical solutions. Furthermore, the model is validated by an experiment where a pipe pile is driven into sand using vibratory loading. Several case scenarios, including the effects of heterogeneity in the soil and three imperfection modes (ovality, out-of-straightness, flatness) on the pile buckling are investigated. The numerical model agrees well with the experimental measurements. As a conclusion, when buckling starts, the penetration rate of the pile decreases compared to the non-buckled pile since less energy is dedicated to pile penetration given that it is spent mainly on buckling.

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Section: Scenario 4: Heterogeneous Soilmentioning

confidence: 98%

Numerical evaluation of buckling in steel pipe piles during vibratory installation

Bakroon

Daryaei

Aubram

et al. 2019

Soil Dynamics and Earthquake Engineering

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“…The potential consequences become more severe for boulders bigger than 1.5 m as they are less likely to be forced away by the installation tools. The installation of Offshore Wind Energy Plant foundations may fail or the piles may suffer structural damage when a boulder is encountered in the process (Holeyman et al., 2015). This project risk is a great concern, as the piles cannot be completely removed from the seabed with the current technologies when a certain foundation depth is exceeded (Gjødvad & Ibsen, 2016; Topham & McMillan, 2017).…”

Section: Introductionmentioning

confidence: 99%

Boulder Detection in the Shallow Sub‐Seafloor by Diffraction Imaging With Beamforming on Ultra‐High Resolution Seismic Data—A Feasibility Study

Römer-Stange

Wenau

Bihler

et al. 2022

Earth and Space Science

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Small‐scale heterogeneities within the seafloor such as glacial boulders, concretions, or unexploded ordnance are of major scientific and economic interest. Because of their small size, such objects are hardly imageable by conventional seismic methods since they produce only faint diffractions. Despite the growing interest, reliable and efficient object detection methods are still not established. So, a marine acquisition system to image objects in the size range 0.3–4.1 m in the near‐surface has been designed and workflows have been developed. Source signals with a central frequency of ∼1,000 Hz are necessary to generate diffractions for the object size range. Performing beam pattern analyses, a rigid tow frame with the dimensions 8 × 3 m and attached hydrophones was designed. A synthetic aperture approach is realized to improve the resolution. Reflection events are suppressed in Normal‐Move‐Out corrected shot gathers by the muting of high singular values to enhance the diffractions. The diffractions are imaged with a beamforming algorithm with a high efficiency, as a total swath angle of about 80° in across‐track direction is covered. The processing of synthetic data sets allows an optimization and validation of the workflow and sensitivity analyses. Ground truthing is achieved with 1–2 m large boulders on the seafloor in 22 m depth, which were identified in a Multi‐Beam Echo Sounder data set. Although diffractions are only weak events in seismic data sets, 3D object detection with seismic beamforming has been found to be an efficient and reliable method to perform derisking for offshore infrastructure installations, drillings, or geologic interpretation.

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“…Holeyman et al (2015) used simplified one-dimensional wave equation analyses to evaluate initiation of plastic strains in the pile due to vertical forces induced by symmetric boulders under the pile tip, exploring different sizes and rock properties Gargarella (2018). conducted a numerical study of the influence of localized asymmetric forces induced by spherical embedded flints on the drivability of tubular piles, assessing the maximum allowable displacement per blow before pile tip damage may occur.…”

mentioning

confidence: 99%

Numerical assessment of tip damage during pile installation in boulder-rich soils

et al. 2024

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The number of incidents worldwide where pile tip damage has occurred during driving has accelerated following the growth of the offshore wind sector, and the expansion into areas with increased risk of embedded boulders or partially weathered soft rocks. The process involving pile-boulder-soil contact can be simulated with advanced 3D large-deformation dynamic coupled Eulerian-Lagrangian (CEL) finite element analysis. However, analyses of this nature are highly time-consuming and computationally expensive. The objective of the paper is to develop a generic framework whereby the potential for denting by a boulder can be assessed a priori. The study encompasses four main components to determine the magnitude of force necessary to create plastic damage of the pile tip and what combination of boulders and soil might generate such reactions during pile installation: (a) a parametric 3D FE structural denting study; (b) a parametric boulder-soil 3D CEL study, where prescribed displacements were applied to the surface of boulders embedded in sand; (c) a range of pile-boulder-soil 3D CEL analyses where a deformable pile and different boulder-soil combinations were simulated; and (d) centrifuge model tests involving tip damage from boulders. Simple relationships and charts have been established from the numerical studies and validated from experimental work.

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Boulder-soil-pile dynamic interaction

Cited by 7 publications

References 0 publications

Numerical evaluation of buckling in steel pipe piles during vibratory installation

Numerical evaluation of buckling in steel pipe piles during vibratory installation

Boulder Detection in the Shallow Sub‐Seafloor by Diffraction Imaging With Beamforming on Ultra‐High Resolution Seismic Data—A Feasibility Study

Numerical assessment of tip damage during pile installation in boulder-rich soils

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