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Microscopic investigation on the physical and mechanical meanings of liquid limit tests on clayy soils.

粘性土液限试验物理力学意义的微观研究

基本信息

批准号：
08660282
负责人：
FUJII Katsumi
金额：
$ 1.41万
依托单位：
Iwate University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08660282/
关键词：
Clayy Soil Yield Stress Tensile Strength Interaction between Clay Particles Liquid Limit

项目摘要

Liquid limit (LL) is defined as the water content in which the soil ceases to flow easily like a liquid and becomes plastic. The two alternative liquid limit tests are standardized in general. One is the Casagrande test which is popular in Japan and the U.S.A., and the other is the fall cone test spread in Europe. The purpose of this study is to experimentally examine the mechanical characteristics of both two tests and investigate their physical meanings from microscopic view point on clay-water system.Two typical clay minerals ; montmorillonite (M) and kaolinite (K) were adopted and their mixture samples were tested according to both standards. In case of K=100% sample, LL values from both tests almost agreed as 30.2%. In proportion to the montmorillonite content, clay samples exhibited a fluidity and their LL values increased linearly. However, increasing degrees were different between them. At the extreme, M=100% sample took 895% from the Casagrande test, while 552% from the fall cone test.This discrepancy proved to result from the differences in physical procedures of both tests and from thixotropic properties of montmorillonite clay. Tensile strengths were also measured for the same samples with the use of simple force gauge. They expressed substantially the same tendency with LL tests and their tensile strengths were evaluated as 20-50 kPa in the state of LL.

液体极限（LL）被定义为土壤不再像液体一样容易流动并变得具有可塑性的含水量。这两种可选的液限试验一般都是标准化的。一种是在日本和美国流行的卡萨格兰德测试，另一种是在欧洲流行的秋锥测试。本研究的目的是通过实验研究这两种试验的力学特性，并从微观角度探讨其对粘土-水体系的物理意义。两种典型粘土矿物；采用蒙脱石(M)和高岭石(K)，按两种标准对其混合试样进行测试。在K=100%样本的情况下，两个测试的LL值几乎一致为30.2%。随着蒙脱土含量的增加，粘土样品呈现流动性，其LL值呈线性增加。然而，他们之间的增长程度有所不同。在极端情况下，M=100%的样本从Casagrande检验中获得895%，从fall cone检验中获得552%。这种差异被证明是由于两种试验的物理程序不同以及蒙脱土的触变特性造成的。用简易测力仪测定了同一试样的抗拉强度。它们与LL试验表现出基本相同的趋势，其抗拉强度在LL状态下被评估为20-50 kPa。