Microstructural changes due to loss of fine particles and mechanism of induced macroscopic degradation of soils

2016 Fiscal Year Final Research Report

• Project/Area Number: 26289153
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Geotechnical engineering
• Research Institution: Kyoto University
• Principal Investigator: HIGO Yosuke 京都大学, 工学(系)研究科(研究院), 准教授 (10444449)
• Co-Investigator(Kenkyū-buntansha): 木元 小百合 京都大学, 工学(系)研究科(研究院), 准教授 (70362457)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 内部侵食 / X線CT

Outline of Final Research Achievements

In this study, a series of permeability tests and triaxial compression tests were conducted using x-ray tomography in order to visualize the process of occurrence of internal erosion, in which the effect of confining pressure on internal erosion is investigated. Under two different confining pressures, considering soils located near surface and rather deep in ground, the specimens were tested. In addition, CT image analyses including segmentation and morphology analysis were carried out to clearly visualize the distribution of the pore water phase as a result of internal erosion.
From the experimental results, it has been found that a rise in confining pressure strengthens the resistance of soils to internal erosion. Morphology analysis clarified the development of water pathway in the specimens due to non-homogeneous internal erosion. Furthermore, Macroscopic strength and stiffness of the soils degrade due to the internal erosion.

Free Research Field

地盤工学