Deformation of Pores in Viscoplastic Soil Material
Publication: International Journal of Geomechanics
Volume 6, Issue 2
Abstract
Changes in soil pore volume and shape in response to internal and external mechanical stresses alter key soil hydrologic and transport properties. The extent of these changes is dependent on details of pore shape and size evolution. We present a model for quantifying rates of deformation and shape evolution of idealized spheroidal pores as functions of macroscopic stresses and soil rheological properties. Previous solutions for shrinkage of spherical pores embedded in a viscoplastic matrix under isotropic stress were extended to spheroidal pore shapes and biaxial stresses using Eshelby’s classical theory. Bulk soil behavior was obtained from upscaling of detailed single pore deformation. Results show that pore closure rates increase with decreasing initial aspect ratio (i.e., oblate pores close faster than spherical pores), and with higher deviatoric stress. Incomplete pore closure is attributed to soil hardening due to pore shape accommodation under biaxial stresses. The model provides a means for approximating pore deformation as input to predictive models for soil hydraulic properties.
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Acknowledgments
The writers gratefully acknowledge support provided by the Swiss National Science Foundation and by the U.S. Department of Agriculture (USDA-NRI, Grant No. UNSPECIFIED2003-35107-13598). They thank Dr. Michael Accorsi for stimulating discussions and a critical review of earlier versions of the manuscript, and Mr. Jon Drasdis for assistance with manuscript preparation.
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Information
Published In
International Journal of Geomechanics
Volume 6 • Issue 2 • March 2006
Pages: 108 - 118
Copyright
© 2006 ASCE.
History
Received: May 3, 2004
Accepted: May 3, 2005
Published online: Mar 1, 2006
Published in print: Mar 2006
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