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Experimental studies on collapse prediction of Shirasu slopes in consideration of the variation of shearing resistance and infiltrationflow caused by various rainfalls on earthquake

考虑地震不同降雨引起的抗剪力和入渗流变化的Shirasu边坡崩塌预测试验研究

基本信息

批准号：
11650518
负责人：
OKABAYASHI Takumi
金额：
$ 1.47万
依托单位：
KAGOSHIMA NATIONAL COLLEGE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

A series of undrained cyclic and monotonic triaxial tests has been performed on a volcanic soil "Shirasu" which has crushable particles. Testing was performed on loose and dense specimens and the results were compared with those of Toyoura sand. As a result, the undrained cyclic and monotonic shear behavior of "Shirasu" is found to be greatly dependent on the confining pressure and its density.In-situ tests for measuring unsaturated permeability of Shirasu are carried out by means of two methods. The first is the method that measures the variation of infiltration rates from the doublering infiltrometer. The other is one that does the variation of water depth in the recharging holes. Unsteady infiltration in the tests are numerically simulated to identify the parameters of Mualem's equation. The parameters are also identified from the laboratory test values that measured from the undisturbed soil. These results are compared and confirmed to be coincide with each other. However, evident difference is revealed in the numerical simulation ; i.e. the computation for the recharging hole needs great amount of running time. From the results, it is cleared that infiltration test with infiltrometer is easy handling and useful method for the measurement in many locatins.

对含有可压碎颗粒的火山土“白须”进行了一系列不排水循环和单调三轴试验。对松散和密实试样进行了试验，并将结果与丰浦砂的结果进行了比较。结果表明，“Shirasu”的不排水循环单调剪切特性对围压和密度有很大的依赖性。第一种方法是通过倍增入渗仪测量入渗速率的变化。另一种是研究回灌孔水深变化的方法。对试验中的非稳定入渗过程进行了数值模拟，确定了Mualem方程的参数。并根据原状土的室内试验值确定了各参数。并对这些结果进行了比较，证实了它们的一致性.但数值模拟结果与实际情况有明显的差别，即回灌孔的计算需要大量的运行时间。结果表明，入渗仪入渗试验操作简便，是一种适用于许多地区的测定方法。

项目成果

期刊论文数量（19）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

岡林巧: "しらす地盤の不飽和浸透特性と非排水せん断挙動"鹿児島工業高等専門学校研究報告. 34. 29-37 (1999)

Takumi Okabayashi：“银鱼地基的不饱和渗流特性和不排水剪切行为”鹿儿岛国立工业大学研究报告书34. 29-37（1999）。

DOI：
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期刊：
影响因子：
0
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通讯作者：

上園健吾・岡林巧・兵動正幸・荒牧憲隆・日下部伸・森尾敏: "水搬送工法により埋立てられたしらすの非排水単調三軸せん断特性"土木学会西部支部研究発表会講演概要集. 第一分冊. A208-A209 (2001)

Kengo Uezono、Takumi Okabayashi、Masayuki Hyodo、Noritaka Aramaki、Shin Kusakabe 和 Satoshi Morio：“通过输水方法回收的银鱼的不排水单调三轴剪切特性”日本土木工程师学会西部分部研究报告的演讲摘要集。第 1 卷 A208-A209 (2001)