Examination of critical state for unsaturated soils using the suction stress in unconfined compression test

B. S. Kim, S. Kato, S. W. Park

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

1 Citation (Scopus)

Abstract

In order to evaluate the characteristic of shear behavior for unsaturated soil under the low confining pressure, a series of the unconfined compression test and the constant water content compression test were carried out using compacted silty clay. This study then examined the effect of the compaction energy according to the variation of the number of compaction times. The negative pore water pressure and the volume change of specimen during shearing were measured under the undrained condition. The peak strength, the post peak strength and the deformation behavior were also examined. As a result, it was found that the post peak strength states are arranged on the failure line of saturated state by considering the suction stress (ps) as a stress component in (pnet+ps, q) space regardless of the compaction energy. The state boundary surface could also be observed in the relationship between the stress ratio, (q/(pnet+ps)) and the specific volume. Therefore, these results can be interpreted that the critical state for unsaturated soil exists in the unconfined compression test under the low confining pressure.

Original languageEnglish
Title of host publication5th Asia-Pacific Conference on Unsaturated Soils 2012
Pages195-200
Number of pages6
Publication statusPublished - Nov 27 2012
Externally publishedYes
Event5th Asia-Pacific Conference on Unsaturated Soils 2012 - Pattaya, Thailand
Duration: Feb 29 2012Mar 2 2012

Publication series

Name5th Asia-Pacific Conference on Unsaturated Soils 2012
Volume1

Other

Other5th Asia-Pacific Conference on Unsaturated Soils 2012
CountryThailand
CityPattaya
Period2/29/123/2/12

Keywords

  • Constant water content compression test
  • Critical state
  • Low confining pressure
  • Suction stress
  • Unconfined compression test
  • Unsaturated soil

ASJC Scopus subject areas

  • Soil Science

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  • Cite this

    Kim, B. S., Kato, S., & Park, S. W. (2012). Examination of critical state for unsaturated soils using the suction stress in unconfined compression test. In 5th Asia-Pacific Conference on Unsaturated Soils 2012 (pp. 195-200). (5th Asia-Pacific Conference on Unsaturated Soils 2012; Vol. 1).