Abstract
In this report, the writers examined shear characteristic of sliding surface clay and movement mechanism of re-slide type landslides through ring shear test results. Consequently, if sliding force is smaller than residual strength, transformation will not take place and strain will keep null. Because relationship between the ring shear test result (φr', WL, Wp, Ip) and clay fraction is examined by multivariate analysis, φr' can be assumed from WL and WP.
