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Title: Hydromechanical Modeling of Unsaturated Flow in Double Porosity Media

Abstract

Geomaterials with aggregated structure or containing fissures often exhibit a bimodal pore size distribution that can be viewed as two coexisting pore regions of different scales. The double-porosity concept enables continuum modeling of such materials by considering two interacting pore scales satisfying relevant conservation laws. This paper develops a thermodynamically consistent framework for hydromechanical modeling of unsaturated flow in double-porosity media. With an explicit treatment of the two pore scales, conservation laws are formulated incorporating an effective stress tensor that is energy-conjugate to the rate of deformation tensor of the solid matrix. A constitutive framework is developed on the basis of energy-conjugate pairs identified in the first law of thermodynamics, which is then incorporated into a three-field mixed finite-element formulation for double-porosity media. In conclusion, numerical simulations of laboratory- and field-scale problems are presented to demonstrate the impact of double porosity on the resulting hydromechanical responses.

Authors:
 [1];  [2];  [1]
  1. Stanford Univ., Stanford, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1474272
Report Number(s):
LLNL-JRNL-757002
Journal ID: ISSN 1532-3641; 944625
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
International Journal of Geomechanics
Additional Journal Information:
Journal Volume: 16; Journal Issue: 6; Journal ID: ISSN 1532-3641
Publisher:
American Society of Civil Engineers
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; coupled problem; double porosity; effective stress; mixture theory; unsaturated flow

Citation Formats

Choo, Jinhyun, White, Joshua A., and Borja, Ronaldo I. Hydromechanical Modeling of Unsaturated Flow in Double Porosity Media. United States: N. p., 2016. Web. doi:10.1061/(ASCE)GM.1943-5622.0000558.
Choo, Jinhyun, White, Joshua A., & Borja, Ronaldo I. Hydromechanical Modeling of Unsaturated Flow in Double Porosity Media. United States. https://doi.org/10.1061/(ASCE)GM.1943-5622.0000558
Choo, Jinhyun, White, Joshua A., and Borja, Ronaldo I. Thu . "Hydromechanical Modeling of Unsaturated Flow in Double Porosity Media". United States. https://doi.org/10.1061/(ASCE)GM.1943-5622.0000558. https://www.osti.gov/servlets/purl/1474272.
@article{osti_1474272,
title = {Hydromechanical Modeling of Unsaturated Flow in Double Porosity Media},
author = {Choo, Jinhyun and White, Joshua A. and Borja, Ronaldo I.},
abstractNote = {Geomaterials with aggregated structure or containing fissures often exhibit a bimodal pore size distribution that can be viewed as two coexisting pore regions of different scales. The double-porosity concept enables continuum modeling of such materials by considering two interacting pore scales satisfying relevant conservation laws. This paper develops a thermodynamically consistent framework for hydromechanical modeling of unsaturated flow in double-porosity media. With an explicit treatment of the two pore scales, conservation laws are formulated incorporating an effective stress tensor that is energy-conjugate to the rate of deformation tensor of the solid matrix. A constitutive framework is developed on the basis of energy-conjugate pairs identified in the first law of thermodynamics, which is then incorporated into a three-field mixed finite-element formulation for double-porosity media. In conclusion, numerical simulations of laboratory- and field-scale problems are presented to demonstrate the impact of double porosity on the resulting hydromechanical responses.},
doi = {10.1061/(ASCE)GM.1943-5622.0000558},
journal = {International Journal of Geomechanics},
number = 6,
volume = 16,
place = {United States},
year = {Thu Jan 28 00:00:00 EST 2016},
month = {Thu Jan 28 00:00:00 EST 2016}
}

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