Micro-mechanical analysis of caisson foundation in sand using DEM: Particle breakage effect

Wang, Pei; Yin, Zhen‐Yu

doi:10.1016/j.oceaneng.2020.107921

Cited by 27 publications

(5 citation statements)

References 87 publications

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“…where a defines the magnitude of anisotropy and θa defines the direction of anisotropy (Rothenburg & Bathurst, 1989;Wang & Yin, 2020). The parameter a can be fitted from the contact orientation distribution using Eq.…”

Section: Discussionmentioning

confidence: 99%

Effect of Stress Level on the Microstructural Evolution of Clay under Creep

et al. 2022

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Creep in clay can significantly affect long-term deformation evolution and therefore impact the safety of geotechnical structures. To improve our understanding of the mechanism of creep, we have examined the microstructural evolution of a kaolin clay sample submitted to creep under three-dimensional or axisymmetric loading conditions, focusing on the effect of the stress level. This experimental study identifies the local mechanisms in normally and over consolidated remolded clay samples during creep under triaxial conditions at different stress levels. The results show that the macro and micro behaviors of the kaolin clay are predominantly governed by the contractancy/dilatancy mechanism activated along stress paths at constant p'. Within the contractancy domain, the SEM observations showed that the microstructural anisotropy increased with the augmentation of the stress level. The microstructural evolution during creep can be attributed to changing patterns in particle reorientation and pore geometry, resulting in plastic strain hardening/softening as well as in viscous fluid flow. The evolution of the clay microstructure therefore depends on both the stress level and the OCR. The differences in the orientation pattern under creep appeared to be enhanced according to the contractancy/dilatancy mechanism. The dilative specimens exhibited particle orientations which were relatively random. The flattening/expansion of the micropores under creep corresponded to the contraction/dilation mechanism at the specimen scale. An attempt based on the analysis of the SEM photographs was made to evaluate the evolution of anisotropy during the different loading phases.

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Section: Discussionmentioning

confidence: 99%

Effect of Stress Level on the Microstructural Evolution of Clay under Creep

et al. 2022

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“…The pipe segment was implemented via finite element mesh (triangular geometry) as a circular cylinder (the number of vertices was 6888), and the mechanical parameters for the pipe were based on the elastic properties of steel. In DEM-based simulations, particle size in the numerical simulation is usually much larger than that in model tests while the span of particle size distribution is narrower to obtain an acceptable computational cost, especially for three-dimensional engineering structure-soil interaction simulations, as presented in previous studies [34,38,[52][53][54]. The diameters of particles in this simulation were between 12 and 24 mm while the median particle diameter (d 50 ) was 16 mm, generated by the gravity deposition method [55].…”

Section: Methodology Of Coupled Dem-femmentioning

confidence: 99%

“…Note that unacceptable computational efficiency will result if particle details in a DEM simulation are the same as those in model tests [34,38,[52][53][54]. Therefore, it is widely accepted that, in DEM-based simulations, many factors such as particle size, shape, and size distribution are simplified compared to those observed in model tests, in order to achieve acceptable computational efficiency [77][78][79][80][81][82].…”

Section: Methodology Of Coupled Dem-femmentioning

confidence: 99%

Micromechanical Analysis of Lateral Pipe–Soil Interaction Instability on Sloping Sandy Seabeds

Peng,

2024

JMSE

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The micromechanical mechanism of pipe instability under lateral force actions on sloping sandy seabeds is unclear. This study investigated the effects of slope angle and instability direction (upslope or downslope) on pipe–soil interaction instability for freely laid and anti-rolling pipes using coupled discrete element method and finite element method (DEM–FEM) simulations. The numerical results were analyzed at both macro- and microscales and compared with the experimental results. The findings revealed that the ultimate drag force on anti-rolling pipes increased with slope angle and was significantly larger than that on freely laid pipes for both downslope and upslope instabilities. Additionally, the rotation-induced upward traction force was proved to be the essential reason for the smaller soil deformation around freely laid pipes. Moreover, the shape differences in the motion trajectories of pipes were successfully explained by variations in the soil supporting force distributions under different slope conditions. Additionally, synchronous movement between the pipe and adjacent particles was identified as the underlying mechanism for the reduced particle collision and shear wear on pipe surfaces under a high interface coefficient. Furthermore, an investigation of particle-scale behaviors revealed conclusive mechanistic patterns of pipe–soil interaction instability under different slope conditions. This study could be useful for the design of pipelines in marine pipeline engineering.

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“…In this study, a low rolling resistance coefficient of 0.1 is adopted to simulate rounded particles with slight elongation according to a series of biaxial tests with DEM conducted by the authors [71]. The model parameters are summarized in Table 1, which were validated in previous DEM studies by the authors [2,34,72].…”

Section:    mentioning

confidence: 99%

Micro-mechanical analysis of soil–structure interface behavior under constant normal stiffness condition with DEM

et al. 2021

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The mechanical behavior at soil-structure interface (SSI) has a crucial influence on the safety and stability of geotechnical structures. However, the behavior of SSI under constant normal stiffness condition from micro to macro scale receives little attention. In this study, the frictional characteristics of SSI and the associated displacement localization under constant normal stiffness condition are investigated at both macro-and microscales by simulating a series of interface shear tests with discrete element method (DEM). The algorithm to achieve a constant normal stiffness is first developed. The macroscopic mechanical response of the interface shear tests with both loose and dense specimens at various normal stiffness is discussed in terms of shear stress, normal stress, vertical displacement, horizontal displacement and stress ratio. Then the microscopic behaviors and properties, including shear zone formation, localized void ratio, coordination number, force chains and soil fabric are investigated. The effect of normal stiffness is thus clarified at both macro-and microscales.

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Micro-mechanical analysis of caisson foundation in sand using DEM: Particle breakage effect

Cited by 27 publications

References 87 publications

Effect of Stress Level on the Microstructural Evolution of Clay under Creep

Effect of Stress Level on the Microstructural Evolution of Clay under Creep

Micromechanical Analysis of Lateral Pipe–Soil Interaction Instability on Sloping Sandy Seabeds

Micro-mechanical analysis of soil–structure interface behavior under constant normal stiffness condition with DEM

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