Modeling Stress-Strain Behavior of Sand-EPS Beads Lightweight Fills Based on Cam-Clay Models
Publication: Recent Advancement in Soil Behavior, in Situ Test Methods, Pile Foundations, and Tunneling: Selected Papers from the 2009 GeoHunan International Conference
Abstract
A lightweight fill was produced by blending expanded polystyrene (EPS) beads and sands in proportions. Such formed granular geomaterials, known as sand-EPS lightweight fills, have potentials of being lightweight compared to traditional fills, thus are suitable for many infrastructure works where less overburdens are expected, e.g., utilities trench backfills. Consolidated drained triaxial compression (TC) tests were conducted on the lightweight fills to observe materials' stress-strain relationships, specifically, the stress-strain variations associated with the mixing ratios of EPS beads. EPS beads were incorporated into the mixtures based on their mass ratios over sands, i.e., 0.5%, 1.5% and 2.5%. It was found that confining pressures and mixing proportions played important roles in affecting the stress-strain behaviors of lightweight fills. The materials underwent shear contraction, which is related to the inclusion of EPS beads. The constitutive law of the lightweight fills was derived based on Cam-clay model and modified Cam-clay model, and verified by the test results.
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Copyright
© 2009 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
ASCE Technical Topics:
- Clays
- Compression tests
- Earth materials
- Engineering fundamentals
- Fills
- Geomaterials
- Geomechanics
- Geotechnical engineering
- Laboratory tests
- Soil mechanics
- Soil properties
- Soil stress
- Soil tests
- Soils (by type)
- Stress (by type)
- Stress strain relations
- Structural analysis
- Structural engineering
- Tests (by type)
- Triaxial tests
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