Primary fabric fraction analysis of granular soils

To, Peter; Galindo‐Torres, S. A.; Scheuermann, Alexander

doi:10.1007/s11440-014-0353-9

Cited by 23 publications

(21 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They may percolate through the primary fabric produced by immobile large particles [25,26]. Kenney and Lau [27] reported that the presence of primary fabric and loose small particles in particulate solid was an origin of internal instability of an assembly.…”

Section: Force and Stress Distributionmentioning

confidence: 99%

Effect of particle size ratio and contribution of particle size fractions on micromechanics of uniaxially compressed binary sphere mixtures

2017

View full text Add to dashboard Cite

This paper is an extension of the recent work of Wiącek (Granul Matter 18:42, 2016), wherein geometrical parameters of binary granular mixtures with various particle size ratio and contribution of the particle size fractions were investigated. In this study, a micromechanics of binary mixtures with various ratio of the diameter of small and large spheres and contribution of small particles was analyzed using discrete element simulations of confined uniaxial compression. The study addressed contact normal orientation distributions, global and partial contact force distributions and pressure distribution in packings of frictional spheres. Additionally, the effect of particle size ratio and contribution of particle size fractions on energy dissipation in granular mixtures was investigated. The particle size ratio in binary packings was chosen to prevent small particles from percolating through bedding. The bimodality of mixtures was found to have a strong effect on distribution of contact normal orientation and distribution of normal contact forces in binary mixtures. Stress transfer in binary packing was also determined by both, particle size ratio and volume fraction of small particles. Dissipation of energy was higher in mixtures with higher particle size ratios and decreased with increasing contribution of small spheres in system.

show abstract

Section: Force and Stress Distributionmentioning

confidence: 99%

Effect of particle size ratio and contribution of particle size fractions on micromechanics of uniaxially compressed binary sphere mixtures

2017

View full text Add to dashboard Cite

show abstract

“…The true triaxial simulation code (TTT code) is implemented in Mechsys, a multiphysics computing library developed at The University of Queensland [55]. The code has been applied to the simulation of biaxial (2D elements: discs) and true triaxial test (3D elements: spheres).…”

Section: Dem: True Triaxial Testmentioning

confidence: 99%

“…In the present study, the packing process is based on an allocation algorithm for spheres encoded by To et al [55,57]. The algorithm allows building two types of particle arrangements: discrete arrangement (DA) and layer-wise arrangement.…”

Section: Packing Processmentioning

confidence: 99%

“…This process involves the allocation of fine particles between coarser ones based on a sequential packing method. The sequential packing method is an efficient semi-analytical tool which resolves trilateration equations to allocate spherical elements in a virtual container [55,57]. …”

Section: Packing Processmentioning

confidence: 99%

“…In the current study, the soil specimen is generated with a porosity of 0.35 which is the same as in the previously cited study [55].…”

Section: Density and Porositymentioning

confidence: 99%

See 2 more Smart Citations

Micromechanical study of granular assemblies by true triaxial test simulations

Hurtado¹,

Jonathan²

View full text Add to dashboard Cite

Geomaterials, such as soils and rocks, are discontinuous and multiphase in nature since they are a mix of particulate elements and different constituents. The discrete nature of geomaterials yields a complex media to deal with regarding predictive capabilities that can only be achieved through expensive computational simulations. The computational modelling of geotechnical problems may consider continuum mechanics or discrete element frameworks to simulate the behaviour of all the features involved. Undoubtedly, continuum-based simulation techniques are predominant in geotechnical engineering practice and have significantly influenced our comprehension of soil response. However, continuum simulations do not consider special features of granular matters at the grain scale that finally determine the characteristic behaviour of particulate materials. On the other hand, the Discrete Element Method (DEM) is in fact based on the inter-particle physical processes at the micro-scale and, in the last decades, has been widely used to simulate a large range of geomaterials, allowing quantitative and qualitative analyses.However, it lacks the scalability and efficiency of models based on continua.This investigation is focused on the modelling of the macroscopic mechanical response of granular assemblies, as a natural consequence of their micromechanical properties, but employing the micro-/mesoscopic method described above. Simulations of true triaxial tests (TTT), an important test in geotechnical engineering, using 3D virtual soil samples are executed with an advanced DEM code that can model assemblies of grains that are made of spherical or non-spherical particles. A DEM-based calibration methodology is thus proposed giving insights on the reliability of the discrete method to replicate soils' mechanical behaviour.ii

show abstract

Micromechanical Modelling of Suffusion: Towards the Stability Analysis of Hydraulic Structures

Wautier

Bonelli²,

Nicot

2017

Springer Series in Geomechanics and Geoengineering

View full text Add to dashboard Cite

Suffusion is the most controversial of the process of internal erosion and piping as there is a lack of microscopic understanding of the degradation processes at stake in saturated soils subjected to an internal flow. Thanks to the use of a DEM-PFV (Discrete Element Method-Pore-scale Finite Volume) approach, this study addresses the fully coupled problem of the suffusion of a non cohesive granular material. Eligible particles to grain detachment and grain transport are characterized from a micromechanical point of view thanks to the use of an enhanced force chain definition and the definition of a pore network. A Representative Elementary Volume with respect to the grain detachment and grain transport is then quantified.

show abstract

Primary fabric fraction analysis of granular soils

Cited by 23 publications

References 22 publications

Effect of particle size ratio and contribution of particle size fractions on micromechanics of uniaxially compressed binary sphere mixtures

Effect of particle size ratio and contribution of particle size fractions on micromechanics of uniaxially compressed binary sphere mixtures

Micromechanical study of granular assemblies by true triaxial test simulations

Micromechanical Modelling of Suffusion: Towards the Stability Analysis of Hydraulic Structures

Contact Info

Product

Resources

About