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GEO- AND HYDRO-MECHANICAL EVALUATION OF SLOPE FAILURE INDUCED BY TORRENTIAL RAINS IN NORTHERN-KYUSHU AREA, JULY 2009
http://hdl.handle.net/10069/30993
http://hdl.handle.net/10069/3099301917b12-cabd-48ab-9663-157af1abbb41
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
SAF51_575.pdf (2.5 MB)
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||
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| 公開日 | 2013-03-14 | |||||
| タイトル | ||||||
| タイトル | GEO- AND HYDRO-MECHANICAL EVALUATION OF SLOPE FAILURE INDUCED BY TORRENTIAL RAINS IN NORTHERN-KYUSHU AREA, JULY 2009 | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Direct box shear test | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Rainfall | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Saturated-unsaturated seepage analysis | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Slope stability | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | Stability analysis | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | journal article | |||||
| 著者 |
Kasama, Kiyonobu
× Kasama, Kiyonobu× Jiang, Yujing× Hiro-oka, Akihiko× Yasufuku, Noriyuki× Sato, Hidefumi |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Torrential rainfall in mid-July 2009 triggered numerous geodisasters such as slope failure and debris flow in Chugoku and Northern Kyushu areas of Japan. A number of slope failures and debris flows occurred in Yamaguchi and Fukuoka prefectures resulting in extensive damage to human life and infrastructure. One of the most serious geodisasters included a slope failure followed by debris flow at Sasaguri-machi and Fukuchi-machi, Fukuoka prefecture, Japan. This paper summarizes the results of geotechnical investigations on the geodisaster sites in Fukuoka prefecture. The geotechnical investigation included determining a series of grain size distributions, consistency limits and conducting direct box shear tests for collapsed soils collected at six disaster sites. The generation mechanisms of slope failure followed by debris flow were also investigated by analyzing the precipitation, topography, geology, and strength properties of the collapsed soils. Moreover, slope deformation and stability analyses were coupled with an unsaturatedsaturated seepage analysis to investigate the slope failure mechanism. The main findings from the study are summarized as: The physical properties, such as the grain size distribution, the plastic limit and liquid limit of collapsed soils, are summarized and compared with the results of other failure slopes in the literature. The collapsed soil was characterized as being a well grained soil (the uniformity coefficient >50) and highly weathered (the ignition loss >5z), however, with regard to the liquid limit and plastic index, there were no remarkable findings. The original shear strength for collapsed soils with natural water content is relatively large and slope failure doesn't occur because the cohesion in the shear strength is induced by a suction force between the soil particles under unsaturated condition. However, water seepage into the soil induces a drastic decrease in the shear strength, which is mainly caused by a decrease in cohesion (losing suction) resulting from soil saturation. In addition, the drained/undrained condition in the shear process is also sensitive to shear strength. For example, both water seepage and the shear process with constant volume cause an approximate 30z reduction in shear strength for Fukuchi-machi and Sasaguri-machi soil samples. Therefore, the reduction of cohesive strength due to water seepage and the low permeability of the slope are the parameters which trigger geodisaster. Based on the results of slope deformation and a stability analyses which took the change in water pressure and cohesive strength into account, the geodisaster at Fukuchi-machi was simulated, it is reasonable to assume that the shallow failure near the top of slope occurred due to torrential precipitation of about 100 mm per hour which triggered a debris flow. | |||||
| 書誌情報 |
SOILS AND FOUNDATIONS 巻 51, 号 4, p. 575-589, 発行日 2011-09-02 |
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| 出版者 | ||||||
| 出版者 | 地盤工学会 | |||||
| 出版者別言語 | ||||||
| 値 | Japanese Geotechnical Society | |||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 00380806 | |||||
| EISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 18811418 | |||||
| DOI | ||||||
| 関連タイプ | isIdenticalTo | |||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.3208/sandf.51.575 | |||||
| 権利 | ||||||
| 権利情報 | © 2011 The Japanese Geotechnical Society | |||||
| 著者版フラグ | ||||||
| 出版タイプ | VoR | |||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
| 引用 | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | SOILS AND FOUNDATIONS, 51(4), pp.575-589; 2011 | |||||
