Effective stresses for unsaturated states stemming from clay microstructure

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Abstract

The paper first discusses a novel microstructure conceptual model for compacted clays based on the assumptions that compacted unsaturated clay is made of a water-saturated part (pores filled with water) and an air-saturated part (pores filled with air). The microstructure conceptual model is exploited to
interpret a variety of MIP from the literature. The paper then shows the capability of the two effective stresses for unsaturated states stemming from this microstructure conceptual model to model volume change and shear strength behaviour of compacted clays. The model built around these two effective
stresses is based on the assumption that the water saturated part behaves like reconstituted clay under saturated conditions and the air-saturated part behaves like clay compressed from dry powder under dry conditions. As a result, mechanical behaviour of compacted clay is modelled by only considering
constitutive parameters from reconstituted clay and clay compressed from dry powder.
LanguageEnglish
Number of pages11
JournalGeomechanics for Energy and the Environment
Early online date12 Apr 2018
DOIs
StateE-pub ahead of print - 12 Apr 2018

Fingerprint

Clay
Microstructure
Air
Powders
Water
Shear strength

Keywords

  • effective stress
  • microstructure
  • pore size distribution
  • unsaturated clay
  • compacted clay
  • wetting
  • shear strength

Cite this

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title = "Effective stresses for unsaturated states stemming from clay microstructure",
abstract = "The paper first discusses a novel microstructure conceptual model for compacted clays based on the assumptions that compacted unsaturated clay is made of a water-saturated part (pores filled with water) and an air-saturated part (pores filled with air). The microstructure conceptual model is exploited tointerpret a variety of MIP from the literature. The paper then shows the capability of the two effective stresses for unsaturated states stemming from this microstructure conceptual model to model volume change and shear strength behaviour of compacted clays. The model built around these two effectivestresses is based on the assumption that the water saturated part behaves like reconstituted clay under saturated conditions and the air-saturated part behaves like clay compressed from dry powder under dry conditions. As a result, mechanical behaviour of compacted clay is modelled by only consideringconstitutive parameters from reconstituted clay and clay compressed from dry powder.",
keywords = "effective stress, microstructure, pore size distribution, unsaturated clay, compacted clay, wetting, shear strength",
author = "Matteo Pedrotti and Alessandro Tarantino",
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AU - Tarantino,Alessandro

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AB - The paper first discusses a novel microstructure conceptual model for compacted clays based on the assumptions that compacted unsaturated clay is made of a water-saturated part (pores filled with water) and an air-saturated part (pores filled with air). The microstructure conceptual model is exploited tointerpret a variety of MIP from the literature. The paper then shows the capability of the two effective stresses for unsaturated states stemming from this microstructure conceptual model to model volume change and shear strength behaviour of compacted clays. The model built around these two effectivestresses is based on the assumption that the water saturated part behaves like reconstituted clay under saturated conditions and the air-saturated part behaves like clay compressed from dry powder under dry conditions. As a result, mechanical behaviour of compacted clay is modelled by only consideringconstitutive parameters from reconstituted clay and clay compressed from dry powder.

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KW - wetting

KW - shear strength

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