Simple model for transient soil loading in earthquake analysis. I. Basic model and its application

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Abstract
Several models describing soil response under cyclic loading and the ‘liquefaction’ potential have been introduced in recent years with limited success. Most of these are over‐complex for realistic parameter identification and have not been widely adopted for practical use. In this paper we introduce a relatively simple modification of the well‐known critical state model which accounts reasonably well for the phenomena observed under cyclic tests and indeed improves the performance of critical state, models in monotonic loading.This model is compared with experimental results and with the ‘densification model’ introduced earlier by the authors and shows good predicitive capacity.The model is of a generalized plasticity‐bounding surface type. In its simplest form, suitable for clay‐like materials, it requires the identifications of a single parameter additional to those required for a standard, critical state model.

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