Visualization of permeability in light weight soil with air foam and its quantitative evaluation using X-ray CT

空气泡沫轻质土渗透性可视化及其 X 射线 CT 定量评估

• 批准号: 13650546
• 负责人: OTANI Jun
• 金额: $ 2.3万
• 依托单位: Kumamoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650546/
• 关键词: Mixed soils; Permeability; Visualization; X-ray CT scanner; Non-destructive testing; Image processing analysis

The objective of this study is not only to visualize permeability in the mixed soil but also to evaluate this behavior quantitatively using X-ray CT scanner. The soil used in this study was so called "light weight soil with air foam". Here, in order to obtain the well quantified results, a new testing apparatus for permeability test was developed, in which this apparatus is especially for the purpose of the use in the X-ray CT system. The proper image processing analysis was used in order to make quantitative discussion possible.Following is the list of the results from this study:1) In order to make sure capability of X-ray CT scanner in this study, the simple permeable behavior was visualized using X-ray CT scanner as a previous study.2) A new type of permeability testing apparatus especially for X-ray CT system was developed and a series of permeability test was conducted with different confining conditions (100 and 300kPa) in the mixed soil which is called light weight soil with air foam.3) In order to make successful quantitative discussion, a method of proper image processing analysis was developed and using this technique, the permeable behavior was discussed not only visually but also quantitatively.4) In addition to those results, the application of this technique to geo-environmental engineering is also expected and here, the diffusion on the contaminant water in the saturated soil was tried to visualize using this testing apparatus with X-ray CT scanner.5) Finally, the effectiveness of industrial X-ray CT scanner in geotechnical engineering was confirmed based on these results in this study.

本研究的目的不仅是可视化的渗透性在混合土，但也定量评估这种行为使用X射线CT扫描仪。本研究中使用的土壤是所谓的“空气泡沫轻质土壤”。为了获得较好的定量结果，研制了一种新的渗透率测试装置，该装置专门用于X射线CT系统中。使用适当的图像处理分析，以使定量讨论成为可能。以下是本研究的结果列表：1）为了验证X射线CT扫描仪的性能，本文在前人研究的基础上，利用X射线CT扫描仪对储层的简单渗透性进行了可视化研究; 2）研制了一套适合于X射线CT系统的渗透性测试装置，并在不同的围压条件下进行了一系列的渗透性测试（100和300 kPa）在混合土中的膨胀系数，称为空气泡沫轻质土。3）为了进行成功的定量讨论，提出了一种图像处理分析方法，并利用该技术对渗透性进行了可视化和定量化的研究。4）除此之外，还对该技术在环境地质工程中的应用进行了展望，利用该试验装置和X射线CT扫描仪对污染水在饱和土壤中的扩散进行了可视化试验。5）最后，在此基础上，证实了工业X射线CT扫描仪在岩土工程中的有效性。

项目成果

J. Otani, T. Mukunoki, K. Nagatome, Y. Kikuchi, T. Sato: "Characterization of seepage and drying on light weight soil with air foam using X-ray CT method"Journal of Civil Engineering, JSCE. No. 701, III-58. 293-302 (2002)

J. Otani、T. Mukunoki、K. Nagatome、Y. Kikuchi、T. Sato：“使用 X 射线 CT 方法对空气泡沫轻质土的渗流和干燥进行表征”土木工程学报，JSCE。

J.Otani: "Evaluation of hydraulic property of light weight soil with air foams"Proceedings of International Workshop on Lightweight Geo-Materials. 159-164 (2002)

J.Otani：“用空气泡沫评估轻质土的水力特性”国际轻质土工材料研讨会论文集。

J.Otani: "Evaluation of hydraulic property of light weight soil with air foams"Proceedings of International Workshop on Lightweight Geo-Materials. 159-164 (2003)

J.Otani：“用空气泡沫评估轻质土的水力特性”国际轻质土工材料研讨会论文集。

大谷 順: "X線CT法を用いた変形の局所化進展現象の可視化"土と基礎. Vol.50 No.2. 49-54 (2002)

Jun Otani：“使用 X 射线 CT 方法可视化局部变形过程”Soil and Foundation Vol.50 No.2 (2002)。

J Otani: "Evaluation of hydraulic property of mixed soil with air foam using X-ray CT method"Proceeding of 2^<nd> Asian Conference on Unsaturated Soils. (掲載決定). (2004)

J Otani：“使用 X 射线 CT 方法评估混合空气泡沫的水力特性”第二届亚洲非饱和土会议论文集（2004 年）。