Debris Flow Disaster in Hofu city, Japan, Induced by the July 2009 Chugoku - Northern KyushuHeavy Rainfall
| Autor: | FUKUOKA, Hiroshi, HADANO, Kesayoshi, YAMAMOTO, Haruhiko, MIYATA, Yuichiro, WANG, Fawu, WANG, Gonghui |
|---|---|
| Jazyk: | japonština |
| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | 京都大学防災研究所年報. A. 53:85-91 |
| ISSN: | 0386-412X |
| Popis: | 平成２１年７月中国・九州北部豪雨により防府市で土石流が多発し１4名が死亡した。調査の結果，主要な災害発生の要因は防府で観測された6時間雨量220.0mmが245.9年確率の集中豪雨であったこと，谷頭において防府市に広く分布するマサが崩壊し，土石流を引き起したことがわかった。一面せん断試験と水圧制御リングせん断試験により崩壊発生過程の再現を試みた。 Since July 19 to 26, 2009, Hofu and surrounding cities in the western Japan had a extremely severerainfall and it caused numerous debris flows in the torrents which claimed lives of 14 residents. Those debrisflows started as small debris slides mostly in the "masa" (weathered granite soils) slope. The return period ofthe 6-hours cumulative precipitation just before the disaster is evaluated to be about 250 years. Pore pressurecontrolled ring shear test was conducted to reproduce the debris slide by raising the pore pressure (backpressure) at a constant and slow rate. A sudden big drop of shear resistance accelerated the sheardisplacement. This was caused by excess pore pressure generation due to the negative dilatancy. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|