Abstract
The creep problems are often involved in soil under cyclic loading, and its behaviors of soil under cyclic loading sparks many arguments in current research field. To propose one new model to demonstrate these creep behaviors of soil under cyclic loading, the cyclic loading was simplified equivalently, and the elastic-viscoplastic model (EVPM) for soil under cyclic loading was established based on the Bingham model. The yield criterion for soil under cyclic loading with constant amplitude was proposed following the simplified load. A constitutive equation based on the EVPM was constructed by using the flow criterion related to the yield criterion. Meanwhile, the parameters of EVPM were identified and discussed. In addition, the case analysis of the EVPM was also performed. The results indicate that the stable and destructive creep behaviors of soil under cyclic loading could be well described by the recommended EVPM, and the obtained parameters in the model exhibited a clear regularity with the increase of dynamic stress amplitude. Besides, the established model could be selected to predict the stable and destructive creep behavior of soil under cyclic loading.
Highlights
In geotechnical engineering, the building foundations often involves creep behaviors of soil under cyclic loading, such as earth dams under the conditions of cyclical changes in water level of reservoir and subgrade soil under traffic load and tunnels under high-speed railway load. e strength and creep characteristics of soil under cyclic loading are critical to the safety of engineering [1]
When the peak deviatoric stress σ1 max − σ3 of cyclic loading is less than the critical dynamic stress σcr of soil, the creep rate soil is faster at the initial stage of loading; as the loading time is prolonged, the strain does not increase but stabilizes; in this case, the creep behavior of soil belongs to stable creep
The elastic-viscoplastic model of soil under cyclic loading is established based on the Bingham model and the yield criterion of soil under equal amplitude cyclic loading is proposed. e major findings are summarized as follows: (1) Cyclic loading is simplified equivalently; a dynamic yield criterion of soil under cyclic loading is proposed in view of the simplified load
Summary
The building foundations often involves creep behaviors of soil under cyclic loading, such as earth dams under the conditions of cyclical changes in water level of reservoir and subgrade soil under traffic load and tunnels under high-speed railway load. e strength and creep characteristics of soil under cyclic loading are critical to the safety of engineering [1]. When the peak deviatoric stress σ1 max − σ3 of cyclic loading is less than the critical dynamic stress σcr of soil, the creep rate soil is faster at the initial stage of loading; as the loading time is prolonged, the strain does not increase but stabilizes; in this case, the creep behavior of soil belongs to stable creep. When the peak deviatoric stress σ1 max − σ3 of cyclic loading is near the critical stress value σcr of soil, the strain of soil sometimes increases and sometimes decreases with the increase of cyclic times N. In this case, the creep behavior of soil belongs to critical creep. The creep constitutive equation was obtained. e parameters of the model were identified and application analysis was conducted on the proposed model
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