Abstract
It is known that the unstable behavior of unsaturated soil includes collapses behavior which is due to the decrease of suction as well as the shear failure. In addition, we often meet the numerical instability for the simulation of unsaturated soil during the wetting process. In the present study, we have performed a one-dimensional linear instability analysis for the air-water-soil coupled three-phase viscoplastic material. From the instability analysis of the viscoplastic unsaturated soil subjected to the water infiltration, we have found that the specific moisture capacity, the matric suction and the hardening parameter affect the instability. Then, we have performed numerical simulations of the behavior of unsaturated soil during the water infiltration using a multi-phase coupled elasto-viscoplastic finite element analysis method. The conditions under which the numerical instability occurs during the simulation agree well with the results by linear instability analysis.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
E.E. Alonso, A. Gens, A. Josa, A constitutive model for partially saturated soils. Geotechnique 40, 405–430 (1990)
E. Garcia, F. Oka, S. Kimoto, Numerical analysis of a one-dimensional infiltration problem in unsaturated soil by a seepage-deformation coupled method. Int. J. Numer. Anal. Methods Geomech. (2010). doi:10.1002/nag908
J.E. Jennings, J.B. Burland, Limitations to the use of effective stresses in partly saturated soils. Geotechnique, 12, 125–144 (1962)
S. Kimoto, F. Oka, T. Fushita, A chemo–thermo–mechanically coupled analysis of ground deformation induced by gas hydrate dissociation. Int. J. Mech. Sci. 52, 365–376 (2009)
F. Oka, T. Kodaka, S. Kimoto, Y.-S. Kim, N. Yamasaki, An elasto-viscoplastic model and multiphase coupled FE analysis for unsaturated soil, in Proceedings of the 4th International Conference on Unsaturated Soils, Geotechnical Special Publication, No. 147, vol. 2 (ASCE, Reston, 2006), pp. 2039–2050
F. Oka, T. Kodaka, H. Suzuki, Y.S. Kim, N. Nishimatsu, S. Kimoto, Experimental study on the behavior of unsaturated compacted silt under triaxial compression. Soils Found. 50, 27–44 (2010)
M.T. van Genuchten, A closed form equation for predicting the hydraulic conductivity of unsaturated soils. Soil Sci. Soc. Am. J. 44, 892–898 (1980)
S.J. Wheeler, V. Sivakumar, An elasto-plastic critical state framework for unsaturated soil. Geotechnique 45, 35–53 (1995)
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2011 Springer Science+Business Media B.V.
About this paper
Cite this paper
Oka, F., Garcia, E., Kimoto, S. (2011). Instability of Unsaturated Soil During the Water Infiltration. In: Bonelli, S., Dascalu, C., Nicot, F. (eds) Advances in Bifurcation and Degradation in Geomaterials. Springer Series in Geomechanics and Geoengineering. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-1421-2_38
Download citation
DOI: https://doi.org/10.1007/978-94-007-1421-2_38
Published:
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-007-1420-5
Online ISBN: 978-94-007-1421-2
eBook Packages: EngineeringEngineering (R0)