Journal
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
Volume 309, Issue -, Pages 653-679Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cma.2016.06.016
Keywords
Coupled problem; Double porosity; Effective stress; Mixture theory
Funding
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Geosciences Research Program [DE-FG02-03ER15454]
- National Science Foundation [CMMI-1462231]
- Fulbright Program
- John A. Blume Earthquake Engineering Center
- Charles H. Leavell Graduate Student Fellowship
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1462231] Funding Source: National Science Foundation
Ask authors/readers for more resources
Natural geomaterials often exhibit pore size distributions with two dominant porosity scales. Examples include fractured rocks where the dominant porosities are those of the fractures and rock matrix, and aggregated soils where the dominant porosities are those of the micropores and macropores. We develop a constitutive framework for this type of materials that covers both steady-state and transient fluid flow responses. The framework relies on a thermodynamically consistent effective stress previously developed for porous media with two dominant porosity scales. We show that this effective stress is equivalent to the weighted sum of the individual effective stresses in the micropores and macropores, with the weighting done according to the pore fractions. This partitioning of the effective stress into two single-porosity effective stresses allows fluid pressure dissipation at the macropores and micropores to be considered separately, with important implications for individual characterization of the hardening responses at the two pore scales. Experimental data suggest that the constitutive framework captures the laboratory responses of aggregated soils more accurately than other models previously reported in the literature. Numerical simulations of boundary-value problems reveal the capability of the framework to capture the effect of secondary compression as the micropores discharge fluids into the macropores. (C) 2016 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available