Grainsize dependence of clastic yielding in unsaturated granular soils

Y. D. Zhang, Giuseppe Buscarnera*

*Corresponding author for this work

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

We use a recent reformulation of the Breakage Mechanics theory explaining comminution in wet granular assemblies. By using a dataset for sands, we quantify the relation between a geometric descriptor of the assembly (i.e., the mean grainsize) and the model constants that control the suction air-entry value and the stress threshold at the onset of crushing. Such relations are used to define two contrasting scenarios for the coupling between degree of saturation and yielding. In the first scenario, the suction air-entry value scales inversely with the mean grainsize, while the energy input for comminution is assumed to be independent of the size of the particles. The outcome of this assumption is that changes in degree of saturation are predicted to play a more intense role in finer gradings. Conversely, if we assume that also the energy input for grain breakage scales inversely with the size of the particles, the effect of the degree of saturation is predicted to be stronger in coarser assemblies. In other words, the deterioration of the yielding stress due to grainsize scaling effects is predicted to exacerbate the water sensitivity of unsaturated crushable soils. This result provides an interpretation for the evidence that solid-fluid interactions have a noticeable role in the compression response of assemblies made of coarse brittle particles (e.g., gravels or rockfill), while they tend to play little or no role in granular materials characterized by a finer grading (e.g., sands).

Original languageEnglish (US)
Pages (from-to)469-483
Number of pages15
JournalGranular Matter
Volume16
Issue number4
DOIs
StatePublished - Jan 1 2014

Fingerprint

assemblies
soils
comminution
suction
saturation
Soils
entry
sands
Comminution
fluid-solid interactions
gravels
crushing
Sand
granular materials
air
deterioration
Granular materials
Crushing
Gravel
assembly

Keywords

  • Capillary effects
  • Grainsize effects
  • Particle breakage
  • Unsaturated soils
  • Yielding

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Physics and Astronomy(all)

Cite this

@article{12eb8342c5234258b62b195b598a694a,
title = "Grainsize dependence of clastic yielding in unsaturated granular soils",
abstract = "We use a recent reformulation of the Breakage Mechanics theory explaining comminution in wet granular assemblies. By using a dataset for sands, we quantify the relation between a geometric descriptor of the assembly (i.e., the mean grainsize) and the model constants that control the suction air-entry value and the stress threshold at the onset of crushing. Such relations are used to define two contrasting scenarios for the coupling between degree of saturation and yielding. In the first scenario, the suction air-entry value scales inversely with the mean grainsize, while the energy input for comminution is assumed to be independent of the size of the particles. The outcome of this assumption is that changes in degree of saturation are predicted to play a more intense role in finer gradings. Conversely, if we assume that also the energy input for grain breakage scales inversely with the size of the particles, the effect of the degree of saturation is predicted to be stronger in coarser assemblies. In other words, the deterioration of the yielding stress due to grainsize scaling effects is predicted to exacerbate the water sensitivity of unsaturated crushable soils. This result provides an interpretation for the evidence that solid-fluid interactions have a noticeable role in the compression response of assemblies made of coarse brittle particles (e.g., gravels or rockfill), while they tend to play little or no role in granular materials characterized by a finer grading (e.g., sands).",
keywords = "Capillary effects, Grainsize effects, Particle breakage, Unsaturated soils, Yielding",
author = "Zhang, {Y. D.} and Giuseppe Buscarnera",
year = "2014",
month = "1",
day = "1",
doi = "10.1007/s10035-014-0491-7",
language = "English (US)",
volume = "16",
pages = "469--483",
journal = "Granular Matter",
issn = "1434-5021",
publisher = "Springer New York",
number = "4",

}

Grainsize dependence of clastic yielding in unsaturated granular soils. / Zhang, Y. D.; Buscarnera, Giuseppe.

In: Granular Matter, Vol. 16, No. 4, 01.01.2014, p. 469-483.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Grainsize dependence of clastic yielding in unsaturated granular soils

AU - Zhang, Y. D.

AU - Buscarnera, Giuseppe

PY - 2014/1/1

Y1 - 2014/1/1

N2 - We use a recent reformulation of the Breakage Mechanics theory explaining comminution in wet granular assemblies. By using a dataset for sands, we quantify the relation between a geometric descriptor of the assembly (i.e., the mean grainsize) and the model constants that control the suction air-entry value and the stress threshold at the onset of crushing. Such relations are used to define two contrasting scenarios for the coupling between degree of saturation and yielding. In the first scenario, the suction air-entry value scales inversely with the mean grainsize, while the energy input for comminution is assumed to be independent of the size of the particles. The outcome of this assumption is that changes in degree of saturation are predicted to play a more intense role in finer gradings. Conversely, if we assume that also the energy input for grain breakage scales inversely with the size of the particles, the effect of the degree of saturation is predicted to be stronger in coarser assemblies. In other words, the deterioration of the yielding stress due to grainsize scaling effects is predicted to exacerbate the water sensitivity of unsaturated crushable soils. This result provides an interpretation for the evidence that solid-fluid interactions have a noticeable role in the compression response of assemblies made of coarse brittle particles (e.g., gravels or rockfill), while they tend to play little or no role in granular materials characterized by a finer grading (e.g., sands).

AB - We use a recent reformulation of the Breakage Mechanics theory explaining comminution in wet granular assemblies. By using a dataset for sands, we quantify the relation between a geometric descriptor of the assembly (i.e., the mean grainsize) and the model constants that control the suction air-entry value and the stress threshold at the onset of crushing. Such relations are used to define two contrasting scenarios for the coupling between degree of saturation and yielding. In the first scenario, the suction air-entry value scales inversely with the mean grainsize, while the energy input for comminution is assumed to be independent of the size of the particles. The outcome of this assumption is that changes in degree of saturation are predicted to play a more intense role in finer gradings. Conversely, if we assume that also the energy input for grain breakage scales inversely with the size of the particles, the effect of the degree of saturation is predicted to be stronger in coarser assemblies. In other words, the deterioration of the yielding stress due to grainsize scaling effects is predicted to exacerbate the water sensitivity of unsaturated crushable soils. This result provides an interpretation for the evidence that solid-fluid interactions have a noticeable role in the compression response of assemblies made of coarse brittle particles (e.g., gravels or rockfill), while they tend to play little or no role in granular materials characterized by a finer grading (e.g., sands).

KW - Capillary effects

KW - Grainsize effects

KW - Particle breakage

KW - Unsaturated soils

KW - Yielding

UR - http://www.scopus.com/inward/record.url?scp=84904745450&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84904745450&partnerID=8YFLogxK

U2 - 10.1007/s10035-014-0491-7

DO - 10.1007/s10035-014-0491-7

M3 - Article

VL - 16

SP - 469

EP - 483

JO - Granular Matter

JF - Granular Matter

SN - 1434-5021

IS - 4

ER -