Suction-Volume Change Indices for Natural and Recompacted Clay Soils

Austin H. Olaiz, Sandra Houston, Claudia E. Zapata, Mohammad Mosawi

Research output: Contribution to journalConference articlepeer-review


The mechanical response of unsaturated soil is controlled by the two stress state variables of matric suction and net normal stress. Modern geotechnical laboratory devices allow for the direct measurement of unsaturated soil volumetric response under controlled conditions of both stress state variables. The oedometer pressure plate device (OPPD) is one apparatus that can impose suction-induced partial wetting conditions under constant or varying vertical stress conditions while measuring vertical deformations. This study brings together three extensive laboratory investigations of the mechanical response of fine-grained soil specimens to variations in both matric suction and net normal stress, which were conducted using a series of OPPDs located at Arizona State University's Geotechnical Laboratory. The effects of differing soil index properties, sample preparation, and stress path history on the moisture-driven volumetric response is evaluated. A comparison between the suction-volume change indices of reconstituted clay specimens to those of relatively intact clay specimens is also included.

Original languageEnglish (US)
Pages (from-to)681-692
Number of pages12
JournalGeotechnical Special Publication
Issue numberGSP 343
StatePublished - 2023
Event2023 Geo-Congress: Sustainable Infrastructure Solutions from the Ground Up - Geotechnical Systems from Pore-Scale to City-Scale - Los Angeles, United States
Duration: Mar 26 2023Mar 29 2023

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Architecture
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology


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