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INVESTIGATION FOR NEW TEST METHOD OF WATER RETENTIVITY AND SEEPAGE OF UNSATURATED SOILS

非饱和土保水性及渗水性测试新方法的探讨

基本信息

批准号：
16560440
负责人：
ABE hirofumi
金额：
$ 1.41万
依托单位：
NAGANO 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：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

项目摘要

The result of this investigation was to have clarified that the method of the new proposal for the water retentivity test of soil was a very useful technique.The characteristic of water retention and the infiltration for the unsaturated soils are applied to the slope stability problems at the rainfall. Moreover, the character of the unsaturated soil is paid to attention for application to the soil pollution problem in recent years. However, the weak point of a current testing method for water retentivity is to need very long time for the test. A current testing method needs the testing time from several days of at least to about one month or more. Therefore the experimental data is not accumulated in a situation necessarily. it is one of the causes to not become widespread of the test equipments.The purpose of this investigation is to establish the testing method to put into the water retentivity test of the soils more promptly. The new method to load the suction continuously for the specimen was adopted, and tried and erred research on the new test method was advanced. As a result, it was clarified to be able to shorten the testing time greatly compared with a current test method for water retentivity. Moreover, the examination that repeated tests for process to drain and absorption became possible in a new testing method.It is confidented that the spread of this new technique and the test equipments contributes to the development of the investigation for the unsaturated soil in the future.

研究结果表明，本文提出的土的保水性试验方法是一种很实用的试验方法，将非饱和土的保水性和入渗特性应用于降雨条件下的边坡稳定性问题。近年来，非饱和土的特性在土壤污染问题中的应用也受到重视。然而，现有的保水性测试方法的缺点是测试时间很长。目前的测试方法需要从至少几天到大约一个月或更长的测试时间。因此，实验数据不一定是在一种情况下积累的。本研究的目的是建立一种能更快地应用于土壤保水性试验的测试方法。采用了对试件连续加载吸力的新方法，并对新试验方法进行了试错研究。其结果是，与目前的保水性试验方法相比，能够大大缩短试验时间。新的试验方法使排水和吸水过程的重复试验成为可能，相信新技术和试验设备的推广将有助于非饱和土研究的进一步发展。