Amplitication of earthquake motion by surface soft deposits

地表软沉积物对地震运动的放大

• 批准号: 04302041
• 负责人: TOWHATA Ikuo
• 金额: $ 22.91万
• 依托单位: UNIVERSITY of TOKYO
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Co-operative Research (A)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-04302041/
• 关键词: dynamic responce; amplication; earthquake; alluvium; damage; 常時微動; 原位置調査; 地震被害; 軟弱地盤; 動的応答解析; 等価線型化法; 地震動増幅; 遠心載荷実験; 数値計算; 現地調査

Soil amplification of earthquake motion was investigated. It has been known that the existing technique of earthquake response analysis on soft alluvium underestimates the surface motion. Since this is against the empirical knowledge that the damage is more intense upon the soft alluvium, study was needed to understand the cause of the discrepancy. Centrifuge tests were run to obtain the stress-strain behavior of sand undergoing shaking which was compared with the behavior obtained by conventional element tests without shaking. Field investigation by using micro-tremor technique was conducted in Kushiro City to compare the nature of ground with and without seismic damages during the earthquake in 1993. Finally, One proposes to consider the shear stiffness and damping ratio to vary with the frequency. The other takes the vertically-continuous variation of soil properties into account and solves the equation of wave propagation. Both can give a greater response upon alluvium that conventional types of analysis.

研究了地震运动的土壤扩增。众所周知，对软冲积的现有地震反应分析技术低估了表面运动。由于这违背了经验知识，即对软冲积的损害更为严重，因此需要进行研究以了解差异的原因。进行离心测试以获得经受震动的沙子的应力 - 应变行为，这与传统元素测试所获得的行为相比而不摇动。在Kushiro City进行了使用微型群体技术进行现场调查，以比较1993年地震期间有和没有地震损害的地面的性质。最后，有人建议考虑将剪切刚度和阻尼比与频率变化。另一个考虑了土壤特性的垂直连续变化，并解决了波传播的方程。两者都可以对冲积的常规分析产生更大的反应。

项目成果

神山 眞: "表層地盤条件による最大地動(最大加速度、最大速度、最大変位)の増幅特性について" 軟弱地盤における地震動増幅シンポジウム発表論文集. 126-137

Makoto Kamiyama：“关于取决于表面地面条件的最大地面运动（最大加速度、最大速度、最大位移）的放大特性”软土地基地震运动放大研讨会论文集126-137。

T.Toshinawa and T.Ohmachi: "Ground Motion Simulation by Vsing Simplified Three-Dimensional Finite Element Method" Proceedings of the tenth World Conference on Earthquake Engineering. 2. 851-856 (1992)

T.Toshinawa 和 T.Ohmachi：“用 Vsing 简化三维有限元法进行地面运动模拟”第十届世界地震工程学会论文集。

柳澤栄司: "一斉微動観測の概要" 軟弱地盤における地震動増幅シンポジウム発表論文集. 59-68 (1994)

Eiji Yanagisawa：“同步微震观测概述”软土地基地震运动放大研讨会论文集 59-68 (1994)。

Y.Sasaki,I.Towhata,K.Tokida,K.Yamada,H.Matsumoto,Y.Tamari and S.Saya: "Mechanism of Permanent Displacement of Ground Caused by Seismic Liquefaction" Soils and Foundations. Vol.32No.3. 79-96 (1992)

Y.Sasaki，I.Towhata，K.Tokida，K.Yamada，H.Matsumoto，Y.Tamari 和 S.Saya：“地震液化引起的地面永久位移的机制”土壤和基础。

M.Kamiyama,MJ.O'Rourke,R.Flores-Berrones: "A semi-empirical model of strong-motion peaks with appropriate comparisons to the 1989 Loma Prieta.the 1985 Michoacan and the 1971 San Fernando earthquakes" 土木学会論文集. 483. 29-39 (1994)

M. Kamiyama、MJ. ORourke、R. Flores-Berrones：“强震峰值的半经验模型，并与 1989 年洛马普里塔地震、1985 年米却肯地震和 1971 年圣费尔南多地震进行了适当比较”日本会议记录土木工程师协会。483。29-39（1994）。