Effect of suction stress on critical state of compacted silty soils under low confining pressure

Byeongsu Kim, Seong Wan Park, Yuji Takeshita, Shoji Kato

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The critical-state behavior of an unsaturated dilative specimen under low confining pressure from 0 to 50 kPa was examined by conducting a constant water content-compression (CWCC) test on unsaturated compacted silty soil. Trends in the compressive strength and deformation of specimens were measured from each testing condition. The experimental results were analyzed by assuming that the effective confining stress can be calculated through the use of suction stress, which is defined as the product of the effective degree of saturation and the matric suction. It was found that the postpeak shear-strength states are arranged on the critical-state line for saturated conditions by considering the suction stress as a stress component in the (pnet + ps, q) plane. The state boundary surface was observed in the relationship between the stress ratio [q/(pnet + ps)], considering the suction stress, and referential specific volume (νλ). It can be concluded, therefore, that the existence of a critical state for an unsaturated dilative specimen under low confining pressure is verified through these results.

Original languageEnglish
Article numberD4016010
JournalInternational Journal of Geomechanics
Volume16
Issue number6
DOIs
Publication statusPublished - Dec 1 2016

Keywords

  • Constant water content-compression test
  • Critical state
  • Low confining pressure
  • Suction stress
  • Unsaturated dilative specimen

ASJC Scopus subject areas

  • Soil Science

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