Exploring the micromechanics of non-active clays by way of virtual DEM experiments

Pagano, Arianna Gea; Magnanimo, Vanessa; Weinhart, Thomas; Tarantino, Alessandro

doi:10.1680/jgeot.18.p.060

Cited by 26 publications

(19 citation statements)

References 31 publications

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“…This paper has presented the application of a simple, twodimensional DEM framework for the simulation of clayey geomaterials, previously developed and validated by Pagano et al [5,6]. The DEM framework was used in this study to perform simple shear tests carried out on normally consolidated and over consolidated clay-like specimens.…”

Section: Discussionmentioning

confidence: 99%

“…Clay particles were simulated as rod-shaped elements interacting via both mechanical and electrochemical forces. Initial configurations prior to shearing were extracted from existing simulations of onedimensional compression and unloading of clay-like ε γ τ γ specimens [6]. In particular, specimens having different over consolidation ratios were obtained by choosing initial configurations either belonging to the virgin compression line (OCR=1), or to an unloading-reloading line (OCR>1) in the plane − .…”

Section: Discussionmentioning

confidence: 99%

“…The DEM model adopted in this study is described in details in Pagano et al [6]. Clay particles are simulated as rod-shaped particles made of spherical elementary units, bonded together via an attractive interaction.…”

Section: Dem Analysis 21 Dem Modelmentioning

confidence: 99%

“…Simple-shear simulations were performed on two virtual specimens made of 300 rods, Specimen A and Specimen B. The specimens were prepared in oedometric conditions in a separate set of simulations, as described by Pagano et al [6]. Different over consolidation ratios were obtained by choosing initial configurations prior to shearing, either belonging to the virgin compression line (OCR=1), or to an unloading-reloading line (OCR>1) in the plane − .…”

Section: Preparation Of Virtual Specimensmentioning

confidence: 99%

“…This paper presents the results of DEM simulations performed using a simple, two-dimensional DEM framework implemented by Pagano et al [5,6] using the open source C++ code MercuryDPM [7]. The DEM framework, previously validated against its ability to reproduce qualitative aspects of the one-dimensional compression of clays, was used in this study to simulate simple shear tests.…”

Section: Introductionmentioning

confidence: 99%

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A DEM investigation of the shearing behaviour of non-active clays

2019

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This paper presents the numerical DEM simulation of shear tests on two-dimensional clay-like specimens. Clay particles are modelled as rod-shaped elements made of spherical elementary units. The contact laws implemented in the adopted DEM framework account for both the mechanical interaction developing between particles in contact, and the long-range electro-chemical interaction in the form of Coulombian attraction/repulsion between charged particles. Virtual specimens for shear testing are obtained via the one-dimensional compression and unloading of clay-like particle assemblies, in order to study the effect of different over consolidation ratios on the macroscopic mechanical behaviour. The DEM framework is challenged against its ability to reproduce qualitatively key aspects of the macroscopic behaviour of normally consolidated and over consolidated clays during shearing, including contractive and dilative behaviour, and monotonic and non-monotonic stress-strain behaviour.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Dem Analysis 21 Dem Modelmentioning

confidence: 99%

Section: Preparation Of Virtual Specimensmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A DEM investigation of the shearing behaviour of non-active clays

2019

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Micro‐mechanical analysis of one‐dimensional compression of clay with DEM

Wang

Yin

Hicher

et al. 2023

Num Anal Meth Geomechanics

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In order to clarify the micro‐mechanics of clay during compression, the behavior of clay subjected to one‐dimensional compression is investigated at the particle scale using discrete element method (DEM). The flaky clay particles in the simulation are approximated by clumps made of spheres. A new contact model is implemented to account for the double‐layer repulsive force, the van der Waals attractive force and the mechanical contact force. The effect of sphere arrangement in the particle clump is discussed. The DEM model is validated against experimental observations in terms of macroscopic compressibility, particle dip angle as well as the over consolidated behavior. The e‐logσv curve shows a concave‐to‐linear shape. The evolution of dip angle of clay particles indicates that particles tend to have an anisotropy with a preferential orientation towards horizontal direction. The increase of preconsolidation pressure decreases the initial compressibility due to the increase the number of mechanical contacts. The evolution of average coordination and sphere‐sphere contact shows that the majority of mechanical contacts are generated before the compressive stress reaches 100 kPa. Evolution of soil fabric is presented and discussed.

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Clay Micromechanics: An Analysis of Elementary Mechanisms of Clay Particle Interactions to Gain Insight into Compression Behaviour of Clay

Tarantino

Casarella

Pedrotti

et al. 2021

Challenges and Innovations in Geomechanics

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The macroscopic response of geomaterials is controlled by the processes occurring at the microscale. Understanding these processes is key to interpret experimental data, understand fundamental modes of stress-strain behaviour, inform 'continuum' macroscopic constitutive models, and develop quantitative predictive tools based on Discrete Element Method (DEM) approaches. Unlike granular materials, mechanisms at the particle scale controlling macro-mechanical behaviour of clays are still largely ignored. This paper presents an analysis of elementary mechanisms of clay particle interactions with the aim of gaining an insight into behaviour of clay and advance the process of defining suitable contact laws to be implemented into DEM formulations.

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Exploring the micromechanics of non-active clays by way of virtual DEM experiments

Cited by 26 publications

References 31 publications

A DEM investigation of the shearing behaviour of non-active clays

A DEM investigation of the shearing behaviour of non-active clays

Micro‐mechanical analysis of one‐dimensional compression of clay with DEM

Clay Micromechanics: An Analysis of Elementary Mechanisms of Clay Particle Interactions to Gain Insight into Compression Behaviour of Clay

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