A New Creep-Fatigue Interaction Model for Predicting Deformation of Coarse-Grained Soil.

Studying the creep-fatigue interaction of the coarse-grained soil (CGS) is very important for safety assessment and disaster prevention in subgrade engineering. Current research work is mainly focused on single creep or fatigue deformation. In this paper, a new creep-fatigue interaction model is established to predict the creep-fatigue interaction deformation of different gradation CGS based on the rheological mechanics and the interactive relationship between creep and fatigue complex compliance method. Triaxial creep-fatigue interaction tests of different gradations CGS under different average stresses and frequencies were conducted to verify the new creep-fatigue interaction model. Research results show that for the creep-fatigue and fatigue-creep interaction, the fatigue deformation is always larger than the creep deformation under the same stress level. For the creep-fatigue multi-interaction, the second creep and fatigue deformation are always smaller than the first creep and fatigue deformation. The results of the triaxial creep-fatigue interaction tests verify the validity of this new model.