Abstract
Considering that water films formed beneath low permeable layers in liquefied sand have a great influence on lateral flow mechanism, shaking table tests for saturated sand slopes are carried out. In a saturated uniform sand, flow deformation occurs almost exclusively during shaking, while in a sand slope with a sandwiched silt arc, large flow deformation occurs like a rigid body by the water film effect in the upper layer after shaking even under small accelerations. Results of energy analysis during the post-shaking flow reveals that the shear strength exhibited along the slip surface passing through the water film decreases to 20% of that of uniform sand. It takes non-zero value presumably due to the roughness of the water film.
