| Issue |
E3S Web of Conf.
Volume 415, 2023
8th International Conference on Debris Flow Hazard Mitigation (DFHM8)
|
|
|---|---|---|
| Article Number | 01009 | |
| Number of page(s) | 4 | |
| Section | Processes and Mechanics | |
| DOI | https://doi.org/10.1051/e3sconf/202341501009 | |
| Published online | 18 August 2023 | |
Critical states observed in triaxial compression tests on volcanic pumice soil related to debris flow in the 2008 Iwate-Miyagi Nairiku Earthquake
1 The University of Tokyo, Department of civil engineering, 7-3-1 Hongo, Bunkyo, Tokyo, Japan
2 Port and Airport Research Institute, Geotechnical Engineering Department, 3-1-1 Nagase, Yokosuka, Kanagawa, Japan
3 The University of Tokyo, Institute of Industrial Science, 4-6-1 Komaba, Meguro, Tokyo, Japan
* Corresponding author: hsmt@iis.u-tokyo.ac.jp
The Iwate-Miyagi Nairiku Earthquake (M7.2) that occurred on June 14, 2008, caused a slope failure in Dozo-zawa River near the summit of Mt. Higashi-Kurikoma. The debris flow caused by the slope failure flowed for about 10 km and took the lives of 7 people. The mechanisms of the slope failure and long-distance debris flow have not yet been well understood. In this study, a series of triaxial compression tests was conducted using a highly crushable pumice soil collected from the collapsed area, and shear behavior and particle breakage were discussed. Both reconstituted specimens and intact specimens showed contractancy and reached critical states that implies high flow potential. However, intact specimens preserved looser structure during consolidation and showed stronger contractancy during shearing than the reconstituted specimens, due to their natural soil structure. Significant particle breakage was observed in the tests with reconstituted specimens.
© The Authors, published by EDP Sciences, 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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