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Hydromechanical Modeling of Unsaturated Flow in Double Porosity Media

Journal Article · · International Journal of Geomechanics
 [1];  [2];  [1]
  1. Stanford Univ., Stanford, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

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.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1474272
Report Number(s):
LLNL-JRNL--757002; 944625
Journal Information:
International Journal of Geomechanics, Journal Name: International Journal of Geomechanics Journal Issue: 6 Vol. 16; ISSN 1532-3641
Publisher:
American Society of Civil EngineersCopyright Statement
Country of Publication:
United States
Language:
English

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