Creep behavior of cohesive soils associated with different plasticity indexes

摘要

The creep behavior of cohesive soils is highly related to the plasticity index. To study the relationship between the creep and the plasticity index of soils, a creep model is proposed to apply to the creep behavior of several soils with different plasticity indexes, especially covering the very long 80 year monitoring data on-site and 3.5 year test data in the lab. For the same type of soil, the creep exponent does increase with the plasticity index; however, for different types of soils, there is not a clear trend between them. Besides, because the risk of creep failure depends on the creep exponent and the (normalized) stress-strain curve, it is not certain that the creep failure of one type of soil with a larger creep exponent will be quicker than another type of soil with a lower creep exponent.