研究者詳細 - 廣岡　明彦

論文 - 廣岡　明彦

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2009年7月九州北部豪雨災害における崩壊斜面の地盤特性と復旧状況(<特集>地盤災害と復旧)

笠間清伸，安福規之，廣岡明彦

地盤工学会誌 59 ( 11 ) 18 - 21 2011年11月

種々の土粒子密度を有する砂の液状化および流動特性査読有り

永瀬英生, 廣岡明彦, 三井清志, 濵地将平, 増田雄太郎

構造物の安全性および信頼性（JCOSSAR2011）論文集 7 649 - 656 2011年10月

産業廃棄物汚泥の埋立材としての強度特性評価査読有り

三井清志, 永瀬英生, 廣岡明彦, 太田勇希, 竹下亮, 高橋里世

構造物の安全性および信頼性（JCOSSAR2011）論文集 7 587 - 592 2011年10月

Geo-and hydro-mechanical evaluation of slope failure induced by torrential rains in Northern-Kyushu area, July 2009 査読有り

Kasama K., Jiang Y., Hiro-Oka A., Yasufuku N., Sato H.

Soils and Foundations 51 ( 4 ) 575 - 589 2011年08月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

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.

DOI： 10.3208/sandf.51.575

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84867903404&origin=inward

DS-6 平成21年7月豪雨による山口・九州北部土砂災害とその教訓(ディスカッションセッション,<特集>第45回地盤工学研究発表会) 招待有り

廣岡明彦

地盤工学会誌 58 ( 12 ) 19 - 19 2010年12月

地盤工学会創立60周年・九州支部60年記念事業報告(<特集>九州支部特集号)

廣岡明彦

地盤工学会誌 ( 地盤工学会 ) 58 ( 6 ) 32 - 33 2010年06月

九州支部ここ10年の歩み(<特集>九州支部特集号)

廣岡明彦，北村良介

地盤工学会誌 ( 地盤工学会 ) 58 ( 6 ) 4 - 5 2010年06月

固化材を用いて改良した産業廃棄物汚泥の強度及び溶出特性査読有り

三井清志,永瀬英生,廣岡明彦,武下俊宏,井上玄己

土木構造・材料論文集 ( 25 ) 152 - 161 2009年11月

Influence of ground condition and rainfall intensity on failure mechanism of embankment due to heavy rainfall 査読有り

M．KOBAYASHI,A．HIROOKA

Proc. of the International Joint Symposium on Geodisaster Prevention and Geoenvironment in Asia (JS-Fukuoka 2009) 96 - 101 2009年11月

Strength characteristics of industrial waste sludges mixed with stabilizers 査読有り

K. Mitsui,H. Nagase,A. Hirooka,T. Takeshita

Proc. of the Internatial Joint Symposium on Geodisaster Prevention and Geoenvironment in Asia 129 - 136 2009年11月

2004年インド洋津波におけるスマトラ島北西部沿岸の被災橋梁に関する数値計算査読有り

鴫原良典，藤間功司，幸左賢二，廣岡明彦，二井伸一，庄司　学，宮島昌克，小野祐輔

土木学会論文集B2（海岸工学） 56 ( 1 ) 311 - 315 2009年10月

Stability of embankment and reclaimed land composed of industrial wastes during earthquake 査読有り

H. Nagase,A. Hirooka,S. Nakamura,T. Monzen

Proc. of the Internatial Conference on Performance-Based Design in Earthquake Geotechnical Engineering (IS-Tokyo 2009) 2009年06月

複合構造物・地中構造物((2)土構造物,盛土,抗土圧構造物他,6.地盤と構造物-動的問題,<特集>第43回地盤工学研究発表会) 招待有り

廣岡明彦

地盤工学会誌 56 ( 12 ) 33 - 33 2008年12月

複合構造物・地中構造物((2)土構造物,盛土,抗土圧構造物他,6.地盤と構造物-動的問題,<特集>第43回地盤工学研究発表会) 招待有り

廣岡明彦

地盤工学会誌 56 ( 12 ) 33 - 33 2008年12月

豪雨時の斜面崩壊機構に関する遠心力場散水シミュレーション

小林睦,廣岡明彦,西垣見歩子

地盤工学会誌 56 ( 10 ) 34 - 37 2008年10月

Zoning for Liquefaction and Damage to Structures during the 2005 Fukuoka-ken Seiho-oki Earthquake 査読有り

H. Nagase,K. Zen,A. Hiro-oka,N. Yasufuku,and K. Kasama

Proc. of the 14th World Conference on Earthquake Engineering 2008年04月

Characteristics of Liquefaction Strength of Sand under Overconsolidation and Long-term Consolidation Conditions 査読有り

H. Nagase,A. Hiro-oka,S. Sawada,S. Nakamura and G. Inoue

Proc. of the 14th World Conference on Earthquake Engineering 2008年04月

Liquefaction Strength Characteristics of Compacted Sand Samples Containing Fines 査読有り

H. Nagase,A. Hirooka,N. Tabata,T. Monzen

Proc. of the 13th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering 2007年04月

Geodisasters in Kyushu Area Caused by Typhoon No.14 in September 2005 査読有り

Mitsuhiro SEZAKI,Ryosuke KITAMURA,Noriyuki YASUFUKU,Akihiro HIROOKA,Hidetoshi OCHIAI,Hiroshi YOKOTA,Shigeki SAWAYAMA,Hiromi IMANISHI,Kazuharu MATSUMOTO

Soils and Foundations 46 ( 6 ) 855 - 867 2006年12月

Zoning for Liquefaction and Damage to Port and Harbor Facilities and Others during the 2005 Fukuoka-ken Seiho-oki Earthquake 査読有り

H. Nagase,K. Zen,A. Hirooka,N. Yasufuku,K. Kasama,T. Kobayashi,Y. Maeda,K. Uno,K. Hashimura,G. Chen

Soils and Foundations 46 ( 6 ) 805 - 816 2006年12月

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