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Experimental Study on Mechanical Properties of Soil mixed with Deformable Particles

掺有变形颗粒土力学性能试验研究

基本信息

批准号：
15580216
负责人：
KIMATA Takashi
金额：
$ 1.15万
依托单位：
Osaka Prefecture University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15580216/
关键词：
Deformable Particles Mixed Soil Consolidation Test X-ray CT Triaxial Compression Test Compressive Properties Creep Properties Physical Properties of Soil 透水性保水性画像解析

项目摘要

In this study, mechanical properties, such as deformability, of deformable particle mixed soil using expanded plastic wastes were investigated. At first, one-dimensional compression mechanism of soil which containing deformable particles in the soil skeleton was examined using the results of one-dimensional consolidation tests. As a result, two extra types of compression structural configurations of the components in addition to the ordinary volumetric compression caused by the rearrengement of a rigid particle skeleton as in the case of the deformable particle mixed soil. One of them was the volumetric compression of the deformable particle itself and the other was a further pore phase reduction caused by the deformation of the deformable particles. Then, microscopic observation using X-ray CT was carried out to evaluate the volumetric compression of deformable particles. Consequently, it was quantitatively confirmed that above-mentioned classification of extra components was valid. And in parallel, triaxial compression tests using double cell apparatus were conducted to attempt the individual measurement of volumetric compressive strain into the compression of deformable particle itself and the amount of pore space reduction. However, it was impossible to estimate these two extra types of components individually, because of the existence of the water getting into the pore spaces of expanded plastic particle's surfaces. Therefore, the latter term of this study, creep property and permeability & water retentivity of soils were investigated, for the purpose of the actual application of this expanded plastic wastes into the lightweight geomaterials. As a result, the amount of settlement caused by creep was in proportion to the mixing ratio of the plastic wastes. And as for the physical properties, it was clarified that the permeability and water retentivity were improved in addition to lightening effect, in case of mixing this plastic wastes with soil.

本研究以废发泡塑料为主要原料，探讨可变形颗粒混合土之变形特性。首先，利用一维固结试验的结果，对土骨架中含有变形颗粒的土的一维压缩机理进行了研究。其结果是，除了在变形颗粒混合土的情况下由刚性颗粒骨架的后增强引起的普通体积压缩之外，部件的两种额外类型的压缩结构配置。其中之一是可变形颗粒本身的体积压缩，另一个是由可变形颗粒的变形引起的进一步的孔相减少。然后，使用X射线CT进行显微镜观察，以评估可变形颗粒的体积压缩。因此，定量地证实了上述额外组分的分类是有效的。与此同时，进行了使用双室装置的三轴压缩试验，以尝试将体积压缩应变单独测量为可变形颗粒本身的压缩和孔隙空间减少量。然而，由于存在进入膨胀塑料颗粒表面孔隙的水，因此不可能单独估计这两种额外类型的组分。因此，本研究后期对土的蠕变特性、渗透性和保水性进行了研究，旨在为废弃发泡塑料在轻质土工材料中的实际应用奠定基础。结果表明，蠕变引起的沉降量与废塑料的掺量成正比。在物理性质方面，明确了在将该塑料废弃物与土壤混合的情况下，除了减轻效果之外，还提高了渗透性和保水性。