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

本研究的目的不仅是观察混合土的渗透性，而且是利用x射线CT扫描仪定量评估这种行为。本研究使用的土壤是所谓的“空气泡沫轻质土壤”。在此，为了获得较好的定量结果，研制了一种新的渗透性测试仪器，该仪器特别适用于x射线CT系统。为了使定量讨论成为可能，采用了适当的图像处理分析。以下是本研究的结果列表：1)为了确保本研究中x射线CT扫描仪的能力，作为先前的研究，我们使用x射线CT扫描仪对简单的渗透行为进行了可视化。2)研制了一种专门用于x射线CT系统的新型渗透试验装置，在空气泡沫轻质混合土中进行了不同围压条件（100和300kPa）下的一系列渗透试验。3)为了成功地进行定量讨论，提出了一种适当的图像处理分析方法，并利用该技术对渗透行为进行了视觉和定量的讨论。4)除了这些结果之外，该技术在地球环境工程中的应用也被期望，在这里，使用该测试设备与x射线CT扫描仪尝试可视化污染水在饱和土壤中的扩散。5)最后，基于本研究的结果，验证了工业x射线CT扫描仪在岩土工程中的有效性。

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.