Numerical Study of Undrained 1D Compression for Unsaturated Soil

Kaitlin M. Hall, Patrick J. Fox, Ning Lu

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


This paper presents a new numerical analysis method for one-dimensional, large strain compression of a single undrained, unsaturated soil element. The method builds on the framework of the consolidation model, CS2, which has been used successfully for many consolidation-related engineering applications. In this work, soil properties and relationships are used to model undrained compression from first principles. A numerical study is performed to investigate the effect of increasing applied total stress on element compression and corresponding soil properties. Results indicate that volume change is non-linear and, as the element approaches saturation, an increase in total stress yields a nearly equivalent increase in pore air pressure. Ultimately, this work will serve as a point of departure for the development of a new large strain consolidation model for unsaturated soil.

Original languageEnglish (US)
Pages (from-to)313-322
Number of pages10
JournalGeotechnical Special Publication
Issue numberGSP 303
StatePublished - 2018
Event2nd Pan-American Conference on Unsaturated Soils: Swell-Shrink and Tropical Soils, PanAm-UNSAT 2017 - Dallas, United States
Duration: Nov 12 2017Nov 15 2017

All Science Journal Classification (ASJC) codes

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


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