抄録
Landslides due to piping have occurred frequently in rainy season recently. Piping, known as a complex phenomenon of internal erosion, has not been quantitatively studied in laboratory by element experiment. As an attempt to achieve piping effect, artificial pipes both in vertical and horizontal were created by dissolving glucose in Toyoura sand. A series of hollow cylindrical torsional shear tests were conducted for specimens with and without pipes under different confining pressure. Strains during piping propagation were measured locally by clip gauges. Small strain stiffness of sand was investigated by applying small torsional cyclic loading under different principal stress directions. In addition, failure behavior of sand subjected to piping effect was studied. It was observed that shear band propagated partially along the piping plane in specimen with horizontal pipe.
