Model-based assessment of the effect of surface area growth on the permeability of granular rocks

S. Esna Ashari, A. Das, Giuseppe Buscarnera*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

This paper presents a methodology to track the evolution of hydraulic conductivity in granular rocks by accounting for the combined effect of porosity changes, grain breakage, and cement bond damage. The main objective was to use simplified continuum models to assess the relative role of different microscopic processes. For this purpose, the breakage mechanics theory was used and the computed deformation response was linked to the Kozeny equation, a permeability model able to evaluate the permeability loss resulting from the simultaneous decrease of the porosity and growth of the surface area. In particular, the evolution of the model's internal variables was linked to idealized geometric schemes at the particle scale, with the goal of distinguishing the contribution of the fines generated by the disaggregation of the cement matrix from that of the broken fragments resulting from the crushing of the skeleton. Compression-flow experiments available in the literature for different granular materials were used to test the performance of the proposed approach. The analyses illustrated that the drop in permeability would be severely underestimated without an accurate computation of the growth of the surface area.

Original languageEnglish (US)
Article number04018023
JournalJournal of Engineering Mechanics
Volume144
Issue number5
DOIs
StatePublished - May 1 2018

Fingerprint

Rocks
Cements
Porosity
Granular materials
Hydraulic conductivity
Crushing
Mechanics
Experiments

Keywords

  • Breakage mechanics model
  • Grain size distribution evolution
  • Granular rocks
  • Permeability

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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abstract = "This paper presents a methodology to track the evolution of hydraulic conductivity in granular rocks by accounting for the combined effect of porosity changes, grain breakage, and cement bond damage. The main objective was to use simplified continuum models to assess the relative role of different microscopic processes. For this purpose, the breakage mechanics theory was used and the computed deformation response was linked to the Kozeny equation, a permeability model able to evaluate the permeability loss resulting from the simultaneous decrease of the porosity and growth of the surface area. In particular, the evolution of the model's internal variables was linked to idealized geometric schemes at the particle scale, with the goal of distinguishing the contribution of the fines generated by the disaggregation of the cement matrix from that of the broken fragments resulting from the crushing of the skeleton. Compression-flow experiments available in the literature for different granular materials were used to test the performance of the proposed approach. The analyses illustrated that the drop in permeability would be severely underestimated without an accurate computation of the growth of the surface area.",
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Model-based assessment of the effect of surface area growth on the permeability of granular rocks. / Esna Ashari, S.; Das, A.; Buscarnera, Giuseppe.

In: Journal of Engineering Mechanics, Vol. 144, No. 5, 04018023, 01.05.2018.

Research output: Contribution to journalArticle

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