On the micro mechanics of one-dimensional normal compression

McDowell, G. R.; Bono, John P. de

doi:10.1680/geot.12.p.041

Cited by 203 publications

(146 citation statements)

References 32 publications

Supporting

Mentioning

130

Contrasting

Order By: Relevance

“…The authors have recently shown that it was possible using the discrete element method (DEM) to accurately model the one-dimensional compression of sand [1]. They showed that the normal compression line (NCL) for a sand should be linear when plotted on double-logarithmic axes, and that the compression index-i.e.…”

Section: Introductionmentioning

confidence: 99%

“…This proposition was further demonstrated by supplementary work modelling isotropic normal compression [2], which explored how isotropic boundary conditions give rise to anisotropic local shear stresses with the sample. For onedimensional normal compression, the McDowell and de Bono [1] compression law is given by the equation: log = log y − 1 2 log y…”

Section: Introductionmentioning

confidence: 99%

“…These distributions were described by a characteristic value of strength, σ0 and a Weibull modulus, m. In PFC3D, the value of octahedral shear stress, q induced in a particle compressed diametrically between two walls is proportional to F / d 2 [2]; hence, McDowell and de Bono [1] assumed that for a particle under multiple contacts, the particle would break if the octahedral shear stress was greater than or equal to its strength, where the strengths of the particles satisfy a Weibull distribution of q values. Assuming the Weibull size effect is applicable to soil particles [e.g.…”

Section: Introductionmentioning

confidence: 99%

“…In their previous work on normal compression [1,2,6], the authors allowed each particle to split into two new fragments, with the new sphere fragments overlapping enough to be contained with the bounding parent sphere, while obeying conservation of mass. An alternative to using this replacement method would be using agglomerates [7][8][9][10], i.e.…”

Section: Introductionmentioning

confidence: 99%

“…The simulation procedure used here is identical to that in the above references [1,2,6]; to which the readers are directed to for full details.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Investigating the effects of particle shape on normal compression and overconsolidation using DEM

Bono

McDowell

2016

Granular Matter

View full text Add to dashboard Cite

Discrete element modelling of normal compression has been simulated on a sample of breakable two-ball clumps and compared to that of spheres. In both cases the size effect on strength is assumed to be that of real silica sand. The slopes of the normal compression lines are compared and found to be consistent with the proposed equation of the normal compression line. The values of the coefficient of earth pressure at rest K0,nc are also compared and related to the critical state fiction angles for the two materials. The breakable samples have then been unloaded to establish the stress ratios on unloading. At low overconsolidation ratios the values of K0 follow a wellestablished empirical relationship and realistic Poisson ratios are observed. On progressive unloading both samples head towards passive failure, and the values of the critical state lines in extension in q-p' space are found to be consistent with the critical state angles deduced from the values of K0 during normal compression. The paper highlights the important role of particle shape in governing the stress ratio during both normal compression and subsequent overconsolidation.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The simulation procedure used here is identical to that in the above references [1,2,6]; to which the readers are directed to for full details.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Investigating the effects of particle shape on normal compression and overconsolidation using DEM

Bono

McDowell

2016

Granular Matter

View full text Add to dashboard Cite

show abstract

DEM investigation on the breakage of spherical aggregate under multi‐contact loadings

et al. 2021

View full text Add to dashboard Cite

Particle crushing is commonly encountered during the storage, transportation, and handling of granular assemblies. This work is aimed at ascertaining the applicability of four particle breakage criteria frequently mentioned in literature. Discrete element method (DEM) simulations were conducted to investigate the crushing of spherical aggregates under multicontact loadings. Mean and major principal stress criteria, octahedral shear stress criterion, and maximal contact force (MCF) criterion were then evaluated based on the obtained DEM results. It is found that the first three parameters all vary with the number of loading contacts, demonstrating they cannot predict the crushing of particles under arbitrary loading configuration. Simulation results indicate that the MCF at crushing is related to the number and the spatial arrangement of loading contacts. Thus, strictly speaking, this parameter cannot uniquely define particle breakage either. The influences of the microstructural heterogeneity on the breakage strength of particle and also on the applicability of MCF criterion are discussed.

show abstract

Numerical modelling of railway ballast at the particle scale

Ahmed

Harkness

Pen

et al. 2015

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

Summary The paper describes the development of a technique to simulate triaxial tests on specimens of railway ballast numerically at the particle scale and its validation with reference to physical test data. The ballast particles were modelled using potential particles and the well‐known discrete element method. The shapes of these elemental particles, the particle size distribution and the number of particles (N = 2800) in each numerical triaxial specimen all matched closely to the real ballast material being modelled. Confining pressures were applied to the specimen via a dynamic triangulation of the outer particle centroids. A parametric study was carried out to investigate the effects on the simulation of timestep, strain rate, damping, contact stiffness and inter‐particle friction. Finally, a set of parameters was selected that provided the best fit to experimental triaxial data, with very close agreement of mobilized friction and volumetric strain behaviour. Copyright © 2015 John Wiley & Sons, Ltd.

show abstract

On the micro mechanics of one-dimensional normal compression

Cited by 203 publications

References 32 publications

Investigating the effects of particle shape on normal compression and overconsolidation using DEM

Investigating the effects of particle shape on normal compression and overconsolidation using DEM

DEM investigation on the breakage of spherical aggregate under multi‐contact loadings

Numerical modelling of railway ballast at the particle scale

Contact Info

Product

Resources

About