A simple and efficient approach to capturing bonding effect in naturally microstructured sands by discrete element method

Jiang, Mingjing; Yu, Hai‐Sui; Leroueil, Serge

doi:10.1002/nme.1804

Cited by 101 publications

(72 citation statements)

References 64 publications

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“…In contrast, the second kind of models assumes that a bond can neither reoccur nor retain its strength once it breaks, even if the particles contact again. Such models can be found in the study on microstructured soil [1,2,35]. It can also be found in the study of mechanics of crushable soils [38][39][40] for which the popular commercial software PFC3D developed by Itasca company has been used.…”

Section: Introductionmentioning

confidence: 99%

“…Compared with the experiments, DEM shows several advantages, including: facilitating sample reproducibility; the ability to monitor the evolution of internal stresses in a nondestructive manner; allowing quantitative investigation into bond data. It is mostly useful to understand the relation between bond properties at the level of contacts between particles and observed macroscopic behaviour, and can help better understand the behaviour of naturally microstructured sands [1,2,35].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Bond rolling resistance and its effect on yielding of bonded granulates by DEM analyses

Jiang

Harris

2006

Int. J. Numer. Anal. Meth. Geomech.

138

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SUMMARYA discrete element modelling of bonded granulates and investigation on the bond effect on their behaviour are very important to geomechanics. This paper presents a two-dimensional (2-D) discrete element theory for bonded granulates with bond rolling resistance and provides a numerical investigation into the effect of bond rolling resistance on the yielding of bonded granulates. The model consists of mechanical contact models and equations governing the motion of bonded particles. The key point of the theory is that the assumption in the original bond contact model previously proposed by the authors (55th CSCE-ASCE Conference, Hamilton, Ont., Canada, 2002; 313-320; J. Eng. Mech. (ASCE) 2005; 131(11):1209-1213) that bonded particles are in contact at discrete points, is here replaced by a more reliable assumption that bonded particles are in contact over a width. By making the idealization that the bond contact width is continuously distributed with the normal/tangential basic elements (BE) (each BE is composed of spring, dashpot, bond, slider or divider), we establish a bond rolling contact model together with bond normal/ tangential contact models, and also relate the governing equations to local equilibrium. Only one physical parameter b needs to be introduced in the theory in comparison to the original bond discrete element model. The model has been implemented into a 2-D distinct element method code, NS2D. Using the NS2D, a total of 86 1-D, constant stress ratio, and biaxial compressions tests have been carried out on the bonded granular samples of different densities, bonding strengths and rolling resistances. The numerical results show that: (i) the new theory predicts a larger internal friction angle, a larger yielding stress, more brittle behaviour and larger final broken contact ratio than the original bond model; (ii) the yielding stress increases nonlinearly with the increasing value of b, and (iii) the first-yield curve (initiation of bond breakage), which define a zone of none bond breakage and which shape and size are affected by the material density, is amplified by the bond rolling resistance in analogous to that predicted by the original bond model.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bond rolling resistance and its effect on yielding of bonded granulates by DEM analyses

Jiang

Harris

2006

Int. J. Numer. Anal. Meth. Geomech.

138

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“…For simplicity and clarity, we treat the porous structure as a hexagonal packing with monodisperse spheres to highlight the bonding effect between particles without the influence of packing way and particle size distribution. In future work, we will refine the porous structure with more realistic sand grains, including the effect of the particle size distribution [25] and non-spherical particles such as polyhedron [49].…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…Just as discussed above, the behavior of natural sands evidently is distinct from clean sands usually employed in laboratory owing to the influence of bond between sand grains [25]. Therefore, sand production of cemented granular media is simulated in this part by LBM-DEM with contact bond model, and the influences of bonding strength and flow rate on sand production are discussed.…”

Section: Sand Production Simulationmentioning

confidence: 98%

Bonding Strength Effects in Hydro-Mechanical Coupling Transport in Granular Porous Media by Pore-Scale Modeling

Chen¹,

Xie²,

Chen³

et al. 2016

Computation

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Abstract:The hydro-mechanical coupling transport process of sand production is numerically investigated with special attention paid to the bonding effect between sand grains. By coupling the lattice Boltzmann method (LBM) and the discrete element method (DEM), we are able to capture particles movements and fluid flows simultaneously. In order to account for the bonding effects on sand production, a contact bond model is introduced into the LBM-DEM framework. Our simulations first examine the experimental observation of "initial sand production is evoked by localized failure" and then show that the bonding or cement plays an important role in sand production. Lower bonding strength will lead to more sand production than higher bonding strength. It is also found that the influence of flow rate on sand production depends on the bonding strength in cemented granular media, and for low bonding strength sample, the higher the flow rate is, the more severe the erosion found in localized failure zone becomes.

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“…The discrete element method (DEM) has proved to be a useful tool for modelling granular soil; however, much of currently available literature using DEM to model cemented sand has been limited to two dimensions, for example [9][10][11][12][13]. Potyondy and Cundall [14] included some three dimensional modelling, although their work didn't feature flexible boundaries which are characteristic of laboratory triaxial tests.…”

Section: Introductionmentioning

confidence: 99%

DEM of triaxial tests on crushable cemented sand

2014

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Using the discrete element method, triaxial simulations of cemented sand consisting of crushable particles are presented. The triaxial model used features a flexible membrane, allowing realistic deformation to occur, and cementation is modelled using inter-particle bonds. The effects of particle crushing are explored, as is the influence of cementation on the behaviour of the soil. An insight to the effects that cementation has on the degree of crushing is presented.

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A simple and efficient approach to capturing bonding effect in naturally microstructured sands by discrete element method

Cited by 101 publications

References 64 publications

Bond rolling resistance and its effect on yielding of bonded granulates by DEM analyses

Bond rolling resistance and its effect on yielding of bonded granulates by DEM analyses

Bonding Strength Effects in Hydro-Mechanical Coupling Transport in Granular Porous Media by Pore-Scale Modeling

DEM of triaxial tests on crushable cemented sand

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