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Microstructual Changes and Compressive Strength by means of Consolidation Methd,

通过固结法观察微观结构变化和抗压强度，

基本信息

批准号：
60550343
负责人：
KAZAMA Hidehiko
金额：
$ 0.83万
依托单位：
Saitama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60550343/
关键词：
Anisotropy Clay Compressive strength Consolidation test Microscopy Permeability Shear strength 粘土

项目摘要

The objects in this study are microstructual changes in consolidation process, the characteristics of consolidation and compressive strength by means of one-dimentional, Ko, and isotropic consolidation methods, in cohesive soils. Furthermore the correlations of shear strength anisotropy and orientation of peds are investigated.Five kinds of reconsolidated clayey soiles and approximately twenty kinds of undisturbed cohesive soils were used in this study. Theses samples were carried out one-dimentional, Ko, and isotropic consolidation tests. Unconfined compression test and consolidated undrained triaxial compression and extension tests were performed on these consolidated samples. A scanning electron microscope were used to observe the changes in particle orientation.The main results obtained are as follows:1. The characteristics in one-dimentional consolidation of Ko consolidation test are similar to tendancy. But the volumetric strain of isotropic consolidation in terms of the mean principal stress is smallev than one-dimentional consolidation, and the axial strain is proportional to the deviator stres.2. On the one hand the orientation of each clay particle and / or ped in one-dimentional and Ko consolidation generally becomes parallel to horizontal plane with the increase in consolidation pressure, the other hand in isotropic consolidation becoms to ramdom structure.3. In same void ratio, unconfined compressive strength in one-dimentional consolidation specimen is higher than isotropic consolidation specimen. The differen of strength decreases in proportinal to isotropic consolidation pressure.4. It is illustrated that the relationship between the void ration, orientafion of peds, and unconfined compressive strength or permeability.

本文以粘性土中固结过程的微观结构变化、一维固结、Ko固结和各向同性固结的固结特性和抗压强度为研究对象。此外，还研究了PED的抗剪强度、各向异性和取向之间的关系。本研究使用了5种重固结粘性土和大约20种原状粘性土。对这些试件进行了一维固结、Ko固结和各向同性固结试验。对这些固结试件进行了无侧限压缩试验和固结不排水三轴压缩和拉伸试验。用扫描电子显微镜观察了颗粒取向的变化，得到的主要结果如下：1.KO固结试验的一维固结特性与倾向性相似。但各向同性固结的体积应变与平均主应力成正比，轴向应变与偏应力成正比。一方面，随着固结压力的增大，各粘粒在一维和Ko固结中的取向一般变得平行于水平面；另一方面，在各向同性固结中，各向同性固结的取向逐渐变得杂乱无章。在相同孔隙比条件下，一维固结试件的无侧限抗压强度高于各向同性固结试件。在各向同性固结压力下，强度差减小。阐明了PED的空隙率、取向与无侧限抗压强度或渗透率之间的关系。