Stress-strain characteristics of remolded soil in the weathered layer of Beichuan sandy slate in Wenchuan seismic area

摘要

A great amount of surface destruction and soil disturbance are produced after the Wenchuan earthquake. The disturbed soil may easily cause erosion, collapse, landslide and other disasters. This paper studies the stress-strain relationship and strength of remolded soil through variables of confining pressure, shear rates, and consolidation time. The change of shear strength was discussed under different experimental conditions, and shearing process and deformation shapes were analyzed. The results show that stress-strain curves present strain-hardening phenomenon, and the confining pressure is the most influential among the variables. For the remolded soil, the cohesion is 20.99KPa and friction angle is 22.7°. When the soil strain reaches to 20%, there is no obvious failure surface, but only radial barrel deformation and well-balanced outside form.