Parameters of Hardening Soil Model with Small Strain of Shallow Sandy Silt in Shanghai Lin-Gang Special Area

Abstract:

The hardening soil model with small strain (HSS model) has become one of the most widely used constitutive models in numerical analysis of excavations because it can reflect the attenuation of soils with strain in tiny strain range. The research on small strain shear modulus of silty sand is inconsistent, despite the fact that great progress has been made in the research of typical soft soils in Shanghai. In this study, through triaxial consolidated drained test, triaxial loading-unloading-reloading drained test, consolidation test and resonance column test to measure the small strain stiffness properties of silty sand in Shanghai. The parameters for Lin-Gang involved in the hardening soil model with small strain stiffness, including the initial shear modulus, the soil strength parameters and unloading and reloading modulus. The measured parameters are compared with other soils in Shanghai and verified through practical engineering. The test results can be used as references for numerical analysis of excavation in Shanghai. It is of reference value to similar engineering.

Key words:hardening soil model with small strain(HSS Model);small-strain stiffness;triaxial test;oedometer test;resonant column