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.

本研究的对象是粘性土固结过程中的微观结构变化、一维固结方法、Ko方法和各向同性固结方法的固结特性和抗压强度。此外，还研究了抗剪强度各向异性和颗粒定向的相关性。本研究使用了五种重固结粘土和大约二十种原状粘性土。这些样品进行了一维、Ko 和各向同性固结试验。对这些固结样品进行了无侧限压缩试验和固结不排水三轴压缩和延伸试验。采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 固结检验的一维固结特征与趋势相似。但各向同性固结的平均主应力体积应变比一维固结小，轴向应变与偏应力成正比。 2．一方面，随着固结压力的增加，一维固结和Ko固结中各粘土颗粒和/或ped的取向一般变为平行于水平面，另一方面各向同性固结变为随机结构。 3．在相同孔隙比下，一维固结试件的无侧限抗压强度高于各向同性固结试件。强度差与各向同性固结压力成正比减小。 4．阐述了孔隙率、颗粒取向与无侧限抗压强度或渗透率之间的关系。