Study on the remediation of contaminated fine-grained soils based on the effect of permeability increase by freeze-thaw method

基于冻融增透效应的污染细粒土修复研究

• 批准号: 16560438
• 负责人: ITO Yuzuru
• 金额: $ 2.24万
• 依托单位: Setsunan University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16560438/
• 关键词: contaminated soils; permeability; freeze-thaw; frost heave

The purpose of this study is to clarify the influence of freeze-thaw effect on increase in permeability of fine-grained soils. With sample soils such as Fujimori clay and Kanto loam, the influence of freeze method, overburden pressure, difference of soils, water supply condition and so on is examined. As a result, the followings findings were obtained ;1)It is considered from the experiments that the influence of frost heave is very small for increase in permeability after freeze-thaw treatment. In other words, there is no relationship between the degree of permeability increase and such conditions as temperature descent speed, temperature gradient, freezing speed and or water supply condition.2)Besides the properties of soil, it was cooling temperature and overburden pressure that affected the permeability increase after freeze-thaw treatment. As for the cooling temperature, there is no further effect if the temperature around -5 to -7 ℃ is adopted to freeze the soils. As for the overburden pressure, the method might be effective at least to the depth of 10 to 20 meter below the ground surface.3)It is considered that the reason of permeability increase is something related to a change of soil surface. Because there is a difference in an unconfined strength of remolded soils of the freeze-thaw treated specimen and untreated one. In addition, there was a similarity between the permeability freeze-thaw treated soils and oven-dried ones.

本研究的目的是阐明冻融效应对藤森粘土和关东壤土等细粒土渗透性增加的影响，以及冻结方法、覆盖压力、土壤差异、水的影响。结果表明:1)冻胀对冻融处理后渗透率的增加影响很小。也就是说，渗透率增加的程度与温度下降速度、温度梯度、冻结速度和/或供水条件等条件无关。2)除了土体性质外，冷却温度和覆盖压力也影响渗透率。对于冻融处理后的冷却温度，如果采用-5℃至-7℃左右的温度冻结土体，则不会有进一步的影响。对于覆盖压力，该方法至少对土体可能有效。深度为10 3) 认为渗透率增加的原因与土壤表面的变化有关，因为冻融处理的试件与未处理的重塑土的无侧限强度存在差异。其一，经渗透性冻融处理的土壤与烘干的土壤之间存在相似之处。

项目成果

The on-site remediation of contaminated gine-grained soils based on the effect of permeability change after freezing and thawing

基于冻融后渗透率变化影响的污染细粒土现场修复

• 发表时间: 2005
• 期刊: Proc. 16th ICSMGE
• 作者: Y.Ito;K.Nii;K.Aramoto
• 通讯作者: K.Aramoto

The on-site remediation of contaminated fine-grained soils based on the effect of permeability change after freezing and thawing

基于冻融后渗透率变化影响的污染细粒土现场修复

• 发表时间: 2006
• 期刊: Proc. 16th ICSMGE
• 作者: Y.Ito;K.Nii;K.Aramoto
• 通讯作者: K.Aramoto