Shear behavior of sand-expanded polystyrene beads lightweight fills

来源期刊：中南大学学报(英文版)2008年第z2期

论文作者：邓安 肖杨

文章页码：174 - 179

Key words：expanded polystyrene； lightweight fills； shear strength； mixing ratios； strength envelope； sands

Abstract: Through direct shear and triaxial compression tests, effects of expanded polystyrene (EPS) mass ratios in sand-EPS mixtures and stress status on materials’ shear behavior were investigated. Hyperbolic curves were used to fit relationship between shear stress and shear displacement. The shear behavior is marginally associated with the EPS ratios and normal/confining stresses. Increases of EPS ratios and decreases of normal/confining stresses result in shear strength decreases. The shapes of Mohr-Coulomb’s envelope include linear and piecewise linear types, which are basically determined by the EPS ratio. Such difference is thought related to the embedding or apparent cohesion effect under relatively high EPS ratio conditions. Shear strength parameters can be used for further modeling and design purposes.