PROCEDURES FOR ELASTOPLASTIC LIQUEFACTION MODELING OF SANDS

When subjected to undrained cyclic loading, cohesionless soils are kno wn to build up pore-water pressure to the extent that the soil loses t he effective confining pressure completely, leading to what is known i ts liquefaction. Presented in this paper is an elastoplastic model tha t is capable of describing the stress-strain behavior of sands during such an event. The model is developed by modifying an earlier model, w hich was shown to be capable of modeling the behavior of sands during monotonic loading. Two procedures, one employing an associated flow ru le and another employing a nonassociated flow rule, are proposed for m odeling the pore pressure and strain responses during stress reversal, and their potential for modeling liquefaction behavior is explored. T he model's capability is examined by comparing the theoretical predict ions with experimental triaxial responses.