ABSTRACT
Since damage due to liquefaction occurs every year or two in Japan, liquefaction potential is considered in the design of most structures in the country. Simple methods based on the SPT N-value and particle size are used to judge liquefaction potential. More than 10 methods are used, depending on the type of structure. A method to judge liquefaction potential was introduced into a design standard in 1970, and since then, the simple judgment methods for each structure have been revised several times based on the results of cyclic triaxial tests and case studies of earthquake damage. Nevertheless, there are still some issues to be noted in the application of current judgement methods and several problems to be studied in the future.
