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Structures and physical properties of soil in shear layr

剪切层土的结构和物理性质

基本信息

批准号：
03452269
负责人：
KISHIMOTO Ryojiro
金额：
$ 3.26万
依托单位：
Iwate University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03452269/
关键词：
progress of shear layr orientation of soil particle structure of voik in soil X-ray stereoradiograph scanning electron microscope permeability coefficient N_2-gas adsorption method specific surface area 一面剪断試験剪断変位剪断面土構造土中空隙土

项目摘要

Though shear phenomena of soil are often observed, studies of physical properties of the phenomena are very few. The purposes of this study are to find the soil structures which is formed in the process of shear, and to find physical properties of the structure.Soil samples containning shear layrs at several stages in shear process by box shear tests were tested1.structures of shear layrsX-ray stereoradiographs and scanning electron micrographs were taken. It is found that the shear layrs at the stages of shear failure and creep are formed with very many small shear planes which link together in chains like tree branches.2.Permeability of the shear layrs are measured, and they are larger than that of soil which have not been failed by shear stress.3.influences of soil water content for physical properties of the shear layrsThe structures vary according to water contents, and the shear strength rapidly decrease when water is added.4.void volume and specific surface area of the layrs were measured by H_2O gas and N_2 gas adsorption method. The application conditions of these methods to shear layrs are found.

土的剪切现象是经常观察到的，但对其物理性质的研究却很少。为了揭示剪切过程中形成的土体结构及其物理性质，本文对剪切过程中不同阶段的含剪切层土样进行了箱剪试验，1.对剪切层结构进行了X射线体视照相和扫描电镜照相。结果表明：剪切破坏和蠕变阶段的剪切层是由许多小剪切面组成的，这些小剪切面呈树枝状链状连接在一起; 2.测定了剪切层的渗透率，它们大于未受剪应力破坏的土的渗透率; 3.土壤含水量对剪切层物理性质的影响剪切层的结构因含水量的不同而不同，4.用H_2O气体吸附法和N_2气体吸附法测定了层间空隙体积和比表面积。找出了这些方法对剪切层的适用条件。