Since the pioneering work of Seed and Lee (32), the potential for liquefaction of saturated sands under seismic loading conditions has been carefully considered by many investigators. Typical of these investigations is the laboratory determination of cyclic strength of sands by means of cyclic triaxial tests (3,14,19,20,2 1, 31,35,37,38, 41, 42), cyclic simple shear tests (8,10,28,34), cyclic torsional shear tests (6, 11, 12, 13,44,45), and shaking table tests (5,7,9,30,33,36,40,43).