ANALYSIS ON PERMANENT DEFORMATION OF EMBANKMENTS CAUSED BY EARTHQUAKES
ANALYSIS ON PERMANENT DEFORMATION OF EMBANKMENTS CAUSED BY EARTHQUAKES
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地震引起的路堤永久变形分析
DOI：
10.3208/sandf1972.31.3_97
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
Futoshi Izu
中科院分区：
文献类型：
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作者：
J. Kuwano;K. Ishihara;H. Haya;Futoshi Izu
摘要首先简要介绍了作者提出的一种方法的框架，以评估由于地震运动引起的永久变形。在所提出的方法中，静态和动态应力分析进行了有限元技术，以确定在地震前和地震过程中的有限元在路堤中的应力条件。根据地震时动应力的特点，在实验室试件上施加静、动应力，以尽可能精确地模拟地应力。在原静态分析中使用的土壤模量修改通过软化参数根据每个单元的残余应变电位。利用修正后的模量，计算路堤的残余变形。该方法适用于在日本遭受严重破坏，在过去的地震中的两个水库。第一个案例研究给出了一个计算的永久位移高达1.81米，表明相当不稳定的路堤，实际上完全失败。在第二个案例研究中，计算沉降为27 cm，而观测沉降为21 cm。因此，分析的结果显示出相当好的协议与观测到的变形，由于地震。
ABSTRACT The framework of a methodology proposed by the authors to evaluate the permanent deformation of embankments due to earthquake motions is briefly presented first. In the proposed method, both static and dynamic stress analyses are performed by the finite element technique to determine the stress conditions of the finite elements in an embankment both before and during an earthquake. Based on the characteristic features of the dynamic stresses during earthquakes, static and dynamic stresses are applied to laboratory specimens to simulate the in-situ stresses as precisely as possible. The moduli of the soils used in the original static analysis are modified through softening parameters in accordance with the residual strain potentials of each element. Using the modified moduli, the residual deformation of the embankment is evaluated. The methodology is applied to two embankments in Japan which suffered severe damage during past earthquakes. The first case study gives a calculated permanent displacement as large as 1.81 m, indicating considerable instability of the embankment which actually failed completely. In the second case study, the calculated settlement is 27 cm, compared to the observed settlement of 21 cm. Therefore, the results of the analyses show reasonably good agreement with the observed deformations of the embankments due to the earthquakes.