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首页> 外文会议>Collaborative management of integrated watersheds >NON-LINEAR NUMERICAL MODELING OF CENTRIFUGE-TEST RESULTS FOR EMBANKMENTS UNDERLAIN BY LIQUEFIED SOIL
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NON-LINEAR NUMERICAL MODELING OF CENTRIFUGE-TEST RESULTS FOR EMBANKMENTS UNDERLAIN BY LIQUEFIED SOIL

机译：液化土下路堤离心试验结果的非线性数值模拟

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摘要

Non-linear numerical analyses are frequently used to predict the seismic deformation of dams affected by liquefaction within the structure or its foundation. Ideally, these numerical analyses should be validated using a wide range of information from laboratory tests, centrifuge tests, and, most importantly, well-documented case histories. Case histories of dams affected by liquefaction are, however, limited in number and detail. For this and other reasons it can be advantageous to evaluate the numerical tools using a broader range of physical model and case history data. This paper will provide one such comparison by presenting analysis results of dynamic centrifuge model tests involving bridge approach embankments underlain by liquefied soil. Each of the three centrifuge tests considered two identical approach embankments of dry sand, each 8 m high, separated by a channel. One embankment had a pile group at the crest. The piles extended through the dry embankment and the underlying 5 m of saturated loose sand into a saturated dense sand layer. The embankment, loose sand, and dense sand units were separated by thin silt layers. The numerical simulations were conducted using the program FLAC with the behavior of the soil modeled with the UBCSAND constitutive model. The patterns of deformation predicted by the numerical simulations were similar to those observed from each of the three centrifuge tests. Representative results are presented and discussed in this paper.
机译：非线性数值分析通常用于预测受结构或地基内液化影响的大坝的地震变形。理想情况下，应使用来自实验室测试，离心测试以及最重要的是记录良好的病历的广泛信息来验证这些数值分析。但是，受液化影响的大坝的病历在数量和细节上受到限制。由于这个和其他原因，使用更广泛的物理模型和案例历史数据来评估数字工具可能是有利的。本文将通过提供动态离心机模型试验的分析结果来提供这种比较，该试验涉及液化土壤下的桥梁引道堤。三个离心机测试中的每一个都考虑了两个相同的干砂路堤，每个路堤高8 m，由一个通道隔开。一个路堤在山顶有一个桩群。桩延伸穿过干燥的路堤和下面的5 m饱和疏松砂岩，进入饱和致密砂层。路堤，松散的沙子和稠密的沙子单元被薄薄的淤泥层隔开。使用FLAC程序进行了数值模拟，并使用UBCSAND本构模型对土壤的行为进行了建模。通过数值模拟预测的变形模式类似于从三个离心机测试中观察到的变形模式。本文介绍并讨论了代表性的结果。

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