A series of two-dimensional finite element analyses are performed to simulate the seismic response of slope composed of granular soil. Four sets of input parameters for the nonlinear soil model are used to fit the reference the shear modulus reduction and damping curves, thereby to evaluate the influence of the nonlinear soil model. The first set is fitted to the shear modulus reduction curve. The second and third sets are fitted simultaneously to both shear modulus reduction and damping curves. The final set applied the shear strength adjustment to adequately capture the nonlinear soil response at large strains. The accuracy of each set of parameters are evaluated through comparison with centrifuge model test measurements. It is observed that the nonlinear soil model has a marginal influence on the acceleration response. On the contrary, the vertical settlement is highly influenced by the nonlinear soil model. The discrepancy is shown to increase with an increase in the intensity of the input ground motion. It is demonstrated that the adjustment for the shear strength is important in performing seismic analyses of slopes, which is most often ignored in practice. Based on the results, practical guidelines on how to select the parameters for the nonlinear soil model are provided.

中文翻译：

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非线性土模型对粒状土坡反应的影响

进行了一系列的二维有限元分析，以模拟由粒状土组成的边坡的地震响应。非线性土壤模型的四组输入参数用于拟合参考值的剪切模量减少和阻尼曲线，从而评估非线性土壤模型的影响。第一组拟合到剪切模量降低曲线。第二和第三组同时拟合剪切模量减小和阻尼曲线。最后一组应用抗剪强度调整来充分捕捉大应变下的非线性土壤响应。通过与离心机模型测试测量值进行比较来评估每组参数的准确性。可以看出，非线性土模型对加速度响应具有边际影响。反之，垂直沉降受非线性土模型的影响很大。所示的差异随着输入地面运动强度的增加而增加。结果表明，在进行边坡地震分析时，抗剪强度的调整很重要，而在实践中通常是忽略不计的。根据结果​​，提供了有关如何为非线性土壤模型选择参数的实用指南。