Abstract
This paper investigates the behavior of EPS geofoam in a true triaxial apparatus using 70 mm×70 mm×140 mm prismatic brick-shaped specimens. The specimens are subjected to different stress paths in the deviator (π) plane by means of stress-controlled loading, in which the axial stress is imposed at a rate of 75 kPa/min in the major principal direction. Stress-strain characteristics and volume change behavior have been recorded, and the yield surface has been deduced from the experimental data. The following observations have also been made for the geofoam: (a) it is an elastoplastic hardening material with plastic contractive volume change under compressive loading, (b) it softens stiffness-wise under confining stress, (c) the onset of contractive volume change corresponds quite well to the proportional limit, and (d) yielding is a slightly decreasing function of the intermediate principal stress. The study found that yielding can be represented reasonably well by a Drucker-Prager yield surface.
Original language | English |
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Pages (from-to) | 175-180 |
Number of pages | 6 |
Journal | Geotextiles and Geomembranes |
Volume | 26 |
Issue number | 2 |
DOIs | |
Publication status | Published - 1 Apr 2008 |
Keywords
- Constitutive model
- EPS geofoam
- Radial stress path
- True triaxial test
- Volumetric contraction
- Yield locus
ASJC Scopus subject areas
- Materials Science(all)
- Geotechnical Engineering and Engineering Geology