Effect of pore air pressure on cyclic behavior of unsaturated sandy soil

R. Uzuoka, T. Unno, N. Sento, Motoki Kazama

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Citations (Scopus)

Abstract

Recent laboratory tests suggested that pore air plays an important role during liquefaction of unsaturated soil. In this study effect of pore air pressure on cyclic behavior of unsaturated sandy soil is discussed using three-phase porous media theory. Numerical simulations of the undrained cyclic triaxial tests with unsaturated sandy soils are performed using the porous media theory and simplified elasto-plastic constitutive model. The effect of suction is taken into account by skeleton stress only. The effect of pore air pressure on cyclic behavior of unsaturated sandy soil is discussed through the simulations with three-phase and simplified two-phase analyses. Two-phase analysis assumed that pore air pressure equals to pore water pressure under undrained condition. Three-phase analysis reproduced the cyclic behavior of unsaturated sandy soil with low initial suction. On the contrary two-phase analysis overestimated the volumetric strain due to dilatancy because two-phase analysis assumed equivalent compressibility of pore air and water. Three-phase analysis is applicable for precise prediction of seismic behavior of unsaturated sandy soil.

Original languageEnglish
Title of host publicationUnsaturated Soils
Subtitle of host publicationResearch and Applications - Proceedings of the 6th International Conference on Unsaturated Soils, UNSAT 2014
PublisherTaylor and Francis - Balkema
Pages783-789
Number of pages7
ISBN (Print)9781138026896
Publication statusPublished - 2014 Jan 1
Event6th International Conference on Unsaturated Soils, UNSAT 2014 - Sydney, NSW, Australia
Duration: 2014 Jul 22014 Jul 4

Publication series

NameUnsaturated Soils: Research and Applications - Proceedings of the 6th International Conference on Unsaturated Soils, UNSAT 2014
Volume1

Other

Other6th International Conference on Unsaturated Soils, UNSAT 2014
Country/TerritoryAustralia
CitySydney, NSW
Period14/7/214/7/4

ASJC Scopus subject areas

  • Soil Science

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