Abstract
Post-liquefaction response and residual strength play important roles in stability assessment of liquefied ground. Considering the recent advancements in the application of induced partial saturation for liquefaction mitigation, the state of knowledge in estimating the residual strength should be extended for liquefied desaturated soils. In this paper, the residual strength response of a clean sand at different saturation levels was investigated using a ring shear device. Direct air injection was used to desaturate the soil, which helped with mitigating the liquefaction under cyclic loading. However, by raising the shear strain level, both saturated and partially saturated soils were liquefied, followed by residual strength measurement. Results indicate that the residual strength increased with a reduction of the saturation level because of the change in compressibility and consequent volume reduction. In addition, the strain-rate dependency of the residual strength was confirmed because an increase of shear strain rate resulted in an increase in residual strength under both saturated and partially saturated conditions.
