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砂土液化导致的地基侧向大变形是地震中许多重要的工程设施和建筑物破坏的主要原因之一。简要介绍了可进行液化大变形分析的散粒体材料本构模型——应变空间多机构CG模型,基于FLIP ROSE程序平台,建立了预测和研究倾斜地基砂土液化导致侧向大变形的二维有限元数值分析方法。采用该模型对相同工况的土工动态离心模型试验进行了模拟,通过对比超孔隙水压力、剪切波水平加速度以及地基侧向位移发现,数值预测与试验结果吻合良好,从而验证了该有限元数值分析模型的可靠性。最后利用该数值分析模型预测了倾斜率不同的地基受到相同剪切波作用时,倾斜地基不同深度产生的侧向位移。预测结果显示,随着地基深度的减小,倾斜率对于地震液化导致倾斜地基侧向大变形的影响越来越显著。
One of the major causes of the destruction of many important engineering facilities and structures in the earthquake is the lateral deformation of the foundation caused by sand liquefaction. This paper briefly introduces the CG model of bulk material which can be used for large deformation analysis of liquefaction. Based on the FLIP ROSE program platform, a two-dimensional (3D) model for predicting and studying lateral liquefaction caused by liquefaction of sandy soil is established. Finite element numerical analysis method. The model was used to simulate the geotechnical dynamic centrifuge model test under the same working conditions. Comparing the excess pore water pressure, shear wave horizontal acceleration and foundation lateral displacement, the numerical prediction is in good agreement with the experimental results, which verifies the finite element Reliability of numerical analysis models. Finally, the numerical analysis model is used to predict the lateral displacements at different depths of inclined foundation when the same shear wave is applied to the foundation with different inclination. The prediction results show that as the depth of foundation decreases, the effect of slope on the lateral deformation of inclined foundation caused by earthquake liquefaction is more and more obvious.