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Dynamic behavior of sandy gravel and dense sand during level II earthquake motion considering the properties of soils

考虑土体特性的砂砾石和密砂在II级地震中的动力行为

基本信息

批准号：
14350254
负责人：
GOTO Satoshi
金额：
$ 3.97万
依托单位：
University of Yamanashi
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14350254/
关键词：
Liquefaction gravel Dense sands Level II earthquake motion Standard penetration test liquefaction criteria Undisturbed sample Dynamic behavior

项目摘要

The purpose of this study is to consider the liquefaction properties of gravelly soils and dense sands during level II earthquake motion and to propose highly accurate present-liquefaction criteria or newly developed liquefaction criteria. Following results were obtained:1.Liquefaction properties of gravelly soil and dense sand depositsLiquefaction properties of gravelly soils and dense sands were considered by using undisturbed freezing sample of the Kuzuryu and Edo River sand in laboratory liquefaction tests.2.Scattering reason of liquefaction strength and N-value for gravelly soils and dense sandsDifferent liquefaction strengths were obtained among almost the same sample with similar N-value and fine contents from the liquefaction tests of undisturbed samples. This may be due to the accuracy of N-value, incorrectness using fine contents to evaluate the viscosity and so on, but the aging effects like cementation may be one of the moss important factors to evaluate the in-situ liquefaction strength.3.Proposal of newly developed liquefaction criteriaAs the process to reach the liquefaction stage is also important properties, newly developed liquefaction criteria using an index to show the continuous properties of soils during the earthquake were proposed.

本研究的目的是考虑碎石土和密实砂在II级地震运动的液化特性，并提出高精度的当前液化标准或新开发的液化标准。结果表明：1.砾质土和密砂层的液化特性利用Kuzuryu河砂和江户河砂的原状冻结试样进行室内液化试验，考虑了砾质土和密砂的液化特性; 2.砾质土和密砂液化强度和N值的离散原因原状试样的液化试验中，几乎相同的试样在N值和细粒含量相近的情况下，得到的液化强度不同。这可能是由于N值的准确性、用细粒含量来评价粘度的不正确性等原因造成的，但胶结作用等老化效应可能是评价苔藓原位液化强度的重要因素之一。3.新发展的液化判据的提出由于达到液化阶段的过程也是重要的性质，提出了一种新的液化准则，该准则使用一个指标来表示地震过程中土壤的连续性质。