Micromechanics of non-active clays in saturated state and DEM modelling

Pagano, Arianna Gea; Tarantino, Alessandro; Pedrotti, Matteo; Magnanimo, Vanessa; Windows-Yule, Kit; Weinhart, Thomas

doi:10.1051/epjconf/201714015023

Cited by 4 publications

(3 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…37 Additionally, van der Waals attraction (VdWA) was included in subsequent studies. 36,38–42 While ER and VdWA are medium/long-range interactions, the short-range response (Born's or steric repulsion) is generally treated by an elastic-frictional model. 36,39–42 These studies mostly focus on the isotropic and anisotropic compression behavior 35,36,39,41,42 and on the self-aggregation of mineral layer suspensions in water.…”

Section: Introductionmentioning

confidence: 99%

A meso-scale model of clay matrix: the role of hydration transitions in geomechanical behavior

et al. 2022

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

A meso-scale model of clay matrix: the role of hydration transitions in geomechanical behavior

et al. 2022

View full text Add to dashboard Cite

show abstract

“…[4] included the van der Waals forces in the study of clay soil. Experimental and numerical studies have been made since then with the aim to understand the role of interparticle forces on clay behaviour ( [5][6][7][8][9][10][11][12][13]).…”

Section: Introductionmentioning

confidence: 99%

Aggregation process of kaolinite clay

2019

Self Cite

View full text Add to dashboard Cite

Clay geomaterials pose a great challenge in geotechnical design due to their complex mechanical behaviour. Despite the vast research on clay mechanical behaviour, mechanisms occurring at the particle-scale still remain largely unknown. Particle-to-particle interactions include electro-chemical forces, which can be in turn associated with repulsive/attractive Coulomb interaction and attractive van der Waals force. This work aims to investigate the role of attractive forces (van der Waals and Coulomb) via their control of the process of aggregation (attractive forces tend to form aggregates of clay particles). Dry clay particles were compressed under high stress to reduce particles distances and activate attractive van der Waals and Coulomb forces. Particle size distribution was then measured using laser granulometry to explore aggregation formation. Laser granulometry tests were performed with and without ultrasound and with and without dispersant. Results show that the higher the compressive stress applied to the sample, the bigger is the ‘particle’ size measured by the laser granulometry, which corresponds to formation of aggregation due to attractive forces. Ultrasound appeared to disaggregate the aggregates thus suggesting that van der Waals and Coulomb forces are sensitive to dynamic loading.

show abstract

“…Sjoblom [9] used molecular dynamics (MD) and employed a contact model containing both DLVO and contact forces that exist between charged particles at very short separation distances. Pagano et al [10] proposed a 2D DEM model with a simple tri-linear contact formulation that considers the DLVO forces in a highly ideal manner and simulates also particle contact. In each of these contributions, a single kaolinite clay particle was modelled as an assembly of spherical sub-particles clustered together to form a rigid body.…”

Section: Introductionmentioning

confidence: 99%

An evaluation of contact models for particle-scale simulation of clay

et al. 2019

View full text Add to dashboard Cite

Geotechnical engineers are well aware that the particle surface chemistry and the pore fluid composition can significantly influence the mechanical behaviour of clay. Reference is often made to the Derjaguin-Landau-Vervey-Overbeek (DLVO) theory, which enables the electrochemical interactions between charged particles to be estimated. Hitherto, the absence of an effective framework for particle-scale simulation of clay has inhibited a direct link between these electrochemical interactions and clay behaviour (e.g. load:deformation response) or fabric (i.e. the development of a disperse or flocculated fabric). Ebrahimi [1] demonstrated the viability of using molecular dynamics simulations where the clay grains are simulated as ellipsoidal particles whose interactions are described by an analytical expression called the Gay-Berne (GB) potential. While promising when compared to other approaches documented in the literature, Ebrahimi's work considered only a single clay mineralogy and did not explicitly account for the pore fluid composition. This paper considers the use of the Gay-Berne potential in particle-scale modelling of clay from a more general perspective. Calibration of the GB model parameters to predict kaolinite particle interactions reveals a lack of generality in Ebrahimi's approach. The Gay-Berne potential cannot simulate situations in which attractive and repulsive interactions co-exist, which lead to the classical “cardhouse” fabric, as is the case of kaolinite particles interacting via an acidic pore fluid.

show abstract

Micromechanics of non-active clays in saturated state and DEM modelling

Cited by 4 publications

References 5 publications

A meso-scale model of clay matrix: the role of hydration transitions in geomechanical behavior

A meso-scale model of clay matrix: the role of hydration transitions in geomechanical behavior

Aggregation process of kaolinite clay

An evaluation of contact models for particle-scale simulation of clay

Contact Info

Product

Resources

About