Abstract
The relation between the total kinematic energy and dislocation energy of soil in poie-water is derived from a physical premise and the conservation law of the multiphase-continuum, assuming that the internal friction of soil is idealized by the sliding block model. A pair of material constants are identified to characterize the strength of soil against liquefaction. The procedure to measure them from the cyclic undrained test data is developed. This method is applyed to the liquefaction observed in the Kawagishi-cho during the 1964 Niigata earthquake.
