Effects of confinement on the stress-strain behavior of EPS geofoam

Amsalu Birhan, Dawit Negussey

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

2 Scopus citations

Abstract

EPS geofoam blocks underlying compacted soil and structural loads become subjected to multi-axial loading. Effects of confining pressure on the stress-strain behavior of EPS geofoam have been investigated in previous studies. Some studies found increases in confining stress lead to corresponding decreases in both modulus and compressive strength. Increasing confining stress has also been reported to result in higher compressive strength. Regardless of the sense and attributed significance of the effects of confinement on EPS geofoam behavior, the implied effects on performance are generally not considered in practice. A series of triaxial compression tests was conducted on EPS geofoam of different densities and over a range of confining pressures. Results from the investigation indicate increases in confinement lead to decreases in yield stress and post-yield compressive resistances, depending on the EPS density and range of confining pressures. The sense and practical significance of confining stress effects are discussed. An approach for incorporating the more significant effects of confining stress on EPS geofoam behavior is considered.

Original languageEnglish (US)
Title of host publicationGeotechnical Special Publication
PublisherAmerican Society of Civil Engineers (ASCE)
Pages536-546
Number of pages11
Edition238 GSP
ISBN (Print)9780784413401
DOIs
StatePublished - 2014
Event2014 GeoShanghai International Congress: Ground Improvement and Geosynthetics - Shanghai, China
Duration: May 26 2014May 28 2014

Other

Other2014 GeoShanghai International Congress: Ground Improvement and Geosynthetics
CountryChina
CityShanghai
Period5/26/145/28/14

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Keywords

  • confining pressure
  • density
  • EPS geofoam
  • modulus
  • strength
  • yield stress

ASJC Scopus subject areas

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

Cite this

Birhan, A., & Negussey, D. (2014). Effects of confinement on the stress-strain behavior of EPS geofoam. In Geotechnical Special Publication (238 GSP ed., pp. 536-546). American Society of Civil Engineers (ASCE). https://doi.org/10.1061/9780784413401.053