Prediction of breakage-induced couplings in unsaturated granular soils

Y. D. Zhang, Giuseppe Buscarnera

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

This note addresses the interplay between particle breakage, water-retention curve and deformation processes. For this purpose, a continuum theory for unsaturated granular soils is used to capture the effects of loading and/or wetting in the grain-crushing regime. The theory provides a relation to express the air-entry value of the retention curve as a function of the degree of particle breakage, thus generating a coupled hydro-mechanical formulation. These features are exploited by deriving the incremental relations that govern the hydro-mechanical response. It is then shown that breakagedependent retention curves generate various coupling effects, such as the evolution of the degree of saturation along constant-suction paths and the pressure dependence of the wetting-collapse strains. Since these capabilities are an outcome of coupling terms derived from grain-scale considerations, these results suggest that microstructure-inspired models are important tools to capture the feedbacks between the macro-scale response and the evolution of micro-scale attributes, as well as to minimise the recourse to phenomenological assumptions.

Original languageEnglish (US)
Pages (from-to)135-140
Number of pages6
JournalGeotechnique
Volume65
Issue number2
DOIs
StatePublished - Feb 1 2015

Fingerprint

breakage
wetting
Wetting
Soils
Crushing
water retention
crushing
prediction
suction
Macros
microstructure
soil
saturation
Feedback
Microstructure
air
Air
Water
particle
effect

Keywords

  • Constitutive relations
  • Partial saturation
  • Particle crushing/crushability
  • Sands
  • Suction

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Earth and Planetary Sciences (miscellaneous)

Cite this

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Prediction of breakage-induced couplings in unsaturated granular soils. / Zhang, Y. D.; Buscarnera, Giuseppe.

In: Geotechnique, Vol. 65, No. 2, 01.02.2015, p. 135-140.

Research output: Contribution to journalArticle

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AU - Buscarnera, Giuseppe

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AB - This note addresses the interplay between particle breakage, water-retention curve and deformation processes. For this purpose, a continuum theory for unsaturated granular soils is used to capture the effects of loading and/or wetting in the grain-crushing regime. The theory provides a relation to express the air-entry value of the retention curve as a function of the degree of particle breakage, thus generating a coupled hydro-mechanical formulation. These features are exploited by deriving the incremental relations that govern the hydro-mechanical response. It is then shown that breakagedependent retention curves generate various coupling effects, such as the evolution of the degree of saturation along constant-suction paths and the pressure dependence of the wetting-collapse strains. Since these capabilities are an outcome of coupling terms derived from grain-scale considerations, these results suggest that microstructure-inspired models are important tools to capture the feedbacks between the macro-scale response and the evolution of micro-scale attributes, as well as to minimise the recourse to phenomenological assumptions.

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