Cyclic-loading ring-shear tests to study high-mobility of earthquake-induced-landslides

To study the mechanical behavior of sandy soils under cyclic-loading, a ser ies of undrained cyclic-loading ring-shear tests were conducted. The stress condition of the tests simulated the stress condition of a soil element su bjected to a horizontal seismic force in the sliding zone of an infinitely long slope. Osaka group coarse, sandy soil, silica sand and Toyoura standar d sand were used. The sliding surface liquefaction behavior of different so ils shows a relation dependent on grain crushing susceptibility. The effect s of the initial stress state and frequency of cyclic loading on the high-m obility were also analyzed.