The levels of demand associated with railways for high-speed trains imply great accuracy in the definition of numerical models for the prediction of its behaviour, Therefore, it is increasingly important to account for the nonlinear behaviour of foundation soils of these railways. These soils are subject to cyclic and dynamic loadings, and so, their dynamic response is highly affected by the induced level of cycling shear strain. Several studies have been done to characterize the stiffness and damping variation with cycling shear strain. In this study, this variation is formulated using the proposal of Ishibashi e Zhang (1993) and is used to study the influence of the cycling shear strain on soil foundations in the behavior of the high-speed tracks.
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机译：与高速列车的铁路相关的需求水平暗示着在预测其行为的数值模型的定义中具有很高的准确性，因此，考虑这些铁路的基础土壤的非线性行为变得越来越重要。这些土壤承受周期性和动态载荷，因此，其动态响应受循环剪切应变诱导水平的高度影响。已经进行了一些研究来表征刚度和阻尼随循环剪切应变的变化。在这项研究中，这种变化是根据Ishibashi e Zhang（1993）的建议制定的，用于研究高速剪切行为中循环剪切应变对土壤基础的影响。
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