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A Study on Change in Microstructures and Mechanical Properties of Clayey Soils Subjected to High Temperature Histories

高温历史作用下粘土微观结构和力学性能变化研究

基本信息

批准号：
11650508
负责人：
MORIWAKI Takeo
金额：
$ 2.37万
依托单位：
Hiroshima University
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

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650508/
关键词：
High Temperature Triaxial Test Microstructures Consolidation Properties Shear Properties High Temperature History Temperature Effect Clavev Soil

项目摘要

A triaxial test apparatus which can conduct consolidation, shear and permeability tests under high temperature conditions from 50℃ to 2OO℃ was developed in this study. In order to clarify consolidation and shear characteristics of clayey soils a series of consolidated-undrained triaxial compression tests was carried out using the developed triaxial test apparatus for kaolin clay and bentonite clay under several temperature conditions. As the results, it was found that mechanical properties of clay under 1OO℃ are on the extended lines forecasted from temperature effects below 1OO℃ and no significant change in mechanical properties of clay appears under about 1OO℃. It was also found that the compression strength increases for both kaolin and bentonite clays with the increase of test temperature, and the gradient of the critical state line decreases for kaolin clay but increases for bentonite clay with the increase of test temperature. Moreover, it was found that although the compression strength increases for both clays with the increase of test temperature, the increment of the compression strength corresponding to the decrease of the void ratio due to the increase of test temperature does not appear for both clays.A computer image processing method was developed in order to evaluate quantitative microstructures of clays. Density distributions of Scanning Electron Microscope photographs were measured and their power spectrum were analyzed in this method. It was found from the results obtained by this evaluation method that high temperature reconsolidated clays have a random structure and room temperature reconsolidated clays have an oriented structure.

本文研制了一种可进行50 ~ 200 ℃高温条件下固结、剪切和渗透试验的三轴试验装置。为了研究粘性土的固结和剪切特性，利用自行研制的三轴试验装置，对高岭土和膨润土进行了不同温度条件下的固结不排水三轴压缩试验。结果表明，粘土在100 ℃以下的力学性质处于100 ℃以下温度效应预测的延长线上，在100 ℃左右的力学性质变化不明显。随着试验温度的升高，高岭土和膨润土的抗压强度均增大，高岭土的临界状态线斜率减小，膨润土的临界状态线斜率增大。结果表明，两种粘土的抗压强度均随试验温度的升高而增大，但并没有出现与孔隙比随试验温度升高而减小相对应的抗压强度增大的现象。用该方法测量了扫描电镜照片的密度分布，并对其进行了功率谱分析。结果表明，高温再固结粘土具有随机结构，室温再固结粘土具有定向结构。