Abstract
Large-scale triaxial, K0 compression and constant stress ratio path tests were carried out on two kinds of coarse-grained soils. Stress-strain relationships of these tests were simulated by using UH model for sands to study the applicability of the model to different stress paths of coarse-grained soil, and the results were compared with those of Duncan’s E-B model. It is shown that the mechanical behaviors of coarse-grained soil can be well described by the UH model, and overall its capacity to reflect stress-strain relationship under different stress paths is better than that of Duncan’s E-B model. Finally, the UH model and Duncan’s E-B model were used for stress-deformation analysis of a core rockfill dam. The applicability of UH model for sands to coarse-grained soil was verified.
Highlights
With the challenges of climate change and for reducing the emission of greenhouse gas, the renewable energy, such as the hydropower, has been rapidly developed in China [1]
Based on special laboratory tests, a constitutive model has been verified for this type of soil, and the model has been applied to a rockfill dam
The test results were predicted by unified hardening (UH) model and by E-B model
Summary
With the challenges of climate change and for reducing the emission of greenhouse gas, the renewable energy, such as the hydropower, has been rapidly developed in China [1]. The rockfill material is usually scaled into smaller sized material called coarse-grained soil for laboratory test. The model parameters used for analysis are still mainly gained by laboratory test [4]. In this context, a series of research on the coarse-grained soil was carried out, with the laboratory test and the numerical approaches. Based on special laboratory tests, a constitutive model has been verified for this type of soil, and the model has been applied to a rockfill dam. Most of the models were proposed for clay or sand, and few constitutive models for coarse-grained soil. In order to describe the similarities and differences between clays and sands in a unified constitutive model, Yao et al [16] developed the UH model for clays and sands, called UH model for sands
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