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A Study on Effects of Earthquake Ground Motion and Subsoil Conditions on Liquefaction of Sandy Ground

地震地震动和地基条件对沙地液化的影响研究

基本信息

批准号：
08558037
负责人：
YANAGISAWA Eiji
金额：
$ 8.38万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08558037/
关键词：
Characteristics of input earthquakes Accumulated dissipation energy Maximum velocity Velocity response spectrum Nonlinear behavior Amplification by ground Constitutive equation of sands Dilatancy Characteristics 地震の増巾度特性液状化指数スペクトル強度

项目摘要

Because the fiscal year of 1998 was the last year of this research project, all the researchers of this research group tried to contact each other to keep the good relationship between articles and concentrated to bring their research works to conclusions. The head investigator studied relationship between input earthquake characteristics and liquefaction indices such as degree plasticity and accumulated dissipation energy, and found out the relation between nonlinear behaviors of soil layers due to liquefaction and the seismic parameters such as maximum velocity and maximum response velocity spectrum using the seismic records obtained during the Kobe EarthquakeInvestigators studied on the method of estimation of earthquakes for the design of structures considering the amplification by the surface subsoil and non-stationality of the seismic waves in terms of nonlinearity appeared in the velocity response spectra. A nonlinear incremental constitutive model was also proposed for the three dimensional stress state needed for the liquefaction analyses, which is applicable even to deformation under the stress conditions of rotating principal stresses. To evaluate the actual deformation characteristics, a large scale simple shear apparatus was developed and several tests were performed on the soils containing cobbles and boulders and fundamental deformation characteristics such as dilatancy behaviors and shear strength were studied.

由于1998年度是本研究项目的最后一年，本研究组的所有研究人员都努力相互联系，以保持论文之间的良好关系，并集中精力完成他们的研究工作。首席研究员研究了输入地震特性与液化指标（如塑性度和累积耗散能）之间的关系，利用科比大地震的地震记录，研究了液化引起的土层非线性特性与最大速度、最大反应速度谱等地震参数之间的关系。结构设计中应考虑表层土的放大作用和速度反应谱中出现的非线性地震波的非平稳性。针对液化分析所需的三维应力状态，提出了一种非线性增量本构模型，该模型甚至适用于旋转主应力应力条件下的变形。为了评价土的实际变形特性，研制了大型单剪试验装置，并对含卵石和孤石的土进行了试验，研究了土的变形特性，如粘性特性和抗剪强度。