Abstract
This paper comprehensively describes the characteristics of undrained shear behavior of partly saturated sandy soils, in which flow failure due to liquefaction in alluvial deposits is generally caused. In this study, in order to obtain the relationship between shear stress and strain under partly saturated condition, undrained triaxial compression tests of reconstituted Toyoura sand samples and undisturbed Koshigaya sand samples at various B-values were conducted. It is found that the different evaluation of in-situ flow failure of partly unsaturated sandy soil layers can be revealed because the undrained shear behavior was influenced by relative density and partly saturated condition.
