Study on the stress-strain characteristics of light heterogeneous soil mixed with expanded polystyrene

The influences of cement content, density, water content and age on the deformation behavior of the light heterogeneous soil are studied based on the uniaxial and triaxial stress-strain curves. The type of stress-strain curves is that of strain hardening with different cell pressures, but the principal stress difference varies with variation of confining pressure. The results of tests indicates that a hyperbolic model and a flexible-linear hardening model can reasonably simulate the stress-strain relations under uniaxial and triaxial stresses conditions respectively.