EQUIVALENT TIME AND ELASTIC VISCO-PLASTIC MODELLING OF GEOMATERIALS
等效时间和岩土材料的弹粘塑性模型

The concepts of equivalent time, reference time line etc. are introduced and a simple onedimensional elastic viscoplastic model(1D EVP) is derived. Yin and Grahams 1D EVP model and its verification are also introduced. The creep data of a marine clay and a soft salt rock are used to examine the loadinghistory independence of equivalent time and creep strain rate. It is shown that the general 1D EVP model will approach to the elastic line and the reference time line(elasticplastic line)when the creep parameter /V approches to zero.