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Residual deformation assessment of earth structure against earthquake and its application for design

土结构抗震残余变形评估及其设计应用

基本信息

批准号：
07455190
负责人：
MATSUO Minoru
金额：
$ 4.29万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

This study presents new stability methods of earth structures against earthquakes and rigid-plastic dynamic deformation analysis, and discusses their applicability in practice.1. Consideration on safety factor of earth structure against earthquakesA new stability method based on the shakedown theory considers the acceleration time history of earthquake exactly. The applicability of this method is examined for both sine and irregular acceleration waves enforced at the bedrock. The conclusions in this study were as follows : 1) The effects of periods in enforced accelerations on embankment stability were suitably evaluated. The stability depended on not only the enforced acceleration, but also the dynamic properties of the ground. 2) The applicability of new method is discussed in comparison with the conventional seismic coefficient method.2. Development of rigid-plastic dynamic deformation analysisThe dynamic deformation analysis based on rigid-plastic assumption was developed in purpose of residual deformation assessment of earth structure against earthquakes. The results obtained in this study were as follows : 1) THe rigid-plastic dynamic deformation analysis could simulate the behavior of the geotechnical structures properly which changes their states between rigid body and plastic flow. 2) With the use of the stress history model of clays for repeated loads, the liquifaction process of plane strain repeated test was fairly simulated by rigid-plastic dynamic deformation analysis.

本文提出了土结构抗震稳定的新方法和刚塑性动力变形分析方法，并讨论了它们在实际应用中的适用性。土结构抗震安全系数的考虑基于安定理论的一种新的稳定方法准确地考虑了地震加速度时程。对基岩处施加的正弦波和不规则加速波的适用性进行了检验。研究结果表明：1)较好地评价了加力周期对路堤稳定性的影响。这种稳定性不仅取决于强制加速度，还取决于地面的动力特性。并与传统的地震系数法进行了比较，讨论了新方法的适用性。刚塑性动力变形分析的发展基于刚塑性假设的动力变形分析是为了评估土结构在地震作用下的残余变形而发展起来的。研究结果表明：1)刚塑性动力变形分析可以较好地模拟土工结构在刚体和塑性流动之间转换的行为。2)采用重复加载粘土的应力历史模型，通过刚塑性动态变形分析较好地模拟了平面应变重复试验的液化过程。