Study on factors affecting liquefaction characteristics of sandy deposits considering issues arose after the 2011 off Pacific Coast of Tohoku Earthquake
| Project/Area Number |
24360189
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Geotechnical engineering
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| Research Institution | The University of Tokyo |
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Principal Investigator |
KIYOTA Takashi 東京大学, 生産技術研究所, 准教授 (70431814)
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| Co-Investigator(Renkei-kenkyūsha) |
KONAGAI Kazuo 横浜国立大学, 大学院都市イノベーション学府, 教授 (50126471)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥9,490,000 (Direct Cost: ¥7,300,000、Indirect Cost: ¥2,190,000)
Fiscal Year 2014: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2012: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
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| Keywords | 液状化 / 三軸試験 / 微小変形特性 / 地盤改良 / フライアッシュ / ハザードマップ / 不攪乱試料 / 東日本大震災 / 液状化対策 / 年代効果 / 中空ねじり試験 / 弾性波速度 / 不撹乱試料 / 東北地方太平洋沖地震 / 地盤沈下 |
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| Outline of Final Research Achievements |
This study investigated issues on soil liquefaction after the 2011 off Pacific Coast of Tohoku Earthquake based on comprehensive laboratory tests. The aging effects of soils on liquefaction and small strain characteristics were investigated. A rational liquefaction assessment method could be developed based on not only SPT-N value but also the small strain characteristics. In addition, we pointed out a problem of current liquefaction assessment with an undisturbed soil sample taken by conventional tube sampling method. This study also verified experimentally the effects of flyash on liquefaction resistance buildup and excavatability of the improved soil. Finally, we conducted a simple liquefaction assessment in Urayasu city, and the relationship between liquefaction potential and road subsidence were extracted based from the DSMs. Based on the result, an attempt was made to apply the obtained PL and road subsidence relations to attain a unique hazard map.
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Report
(4 results)
Research Products
(54 results)
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[Journal Article] Use of ‘Gel-Push’ sampling to obtain undisturbed sandy samples for liquefaction analyses2015
Author(s)
Chiaro, G., Kiyota, T., Umehara, Y., Hosono, Y., Yagiura, Y. and Chiba, H.
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Journal Title
Bulletin of Earthquake Resistant Structure, Institute of Industrial Science University of Tokyo
Volume: 48
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Acknowledgement Compliant
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[Journal Article] Maps of soil subsidence for Tokyo bay shore areas liquefied in the March 11th off the Pacific coast of Tohoku earthquake2013
Author(s)
Konagai, K., Kiyota, T., Suyama, S., Asakura, T., Shibuya, K. and Eto, C.
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Journal Title
Soil Dynamics and Earthquake Engineering
Volume: 53
Pages: 240-253
Related Report
Peer Reviewed
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[Journal Article] Mitigation of liquefaction-induced damage to residential houses by shallow ground improvement2013
Author(s)
Kiyota, T., Tani, K., Matsushita, K., Hashimoto, T., Yamamoto, A., Takeuchi H., Noda, T., Kiku, H. and Obayashi, J.
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Journal Title
Proc. of New Zealand-Japan Workshop on Soil Liquefaction during Recent Large-Scale Earthquakes
Volume: 1
Pages: 141-150
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Peer Reviewed
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[Journal Article] Subsidence map of Tokyo bay area liquefied in the March 11th Great East Japan Earthquake2012
Author(s)
Konagai, K., Kiyota, T., Asakura, T., Suyama, S., Kyokawa. H., Shibuya, K. and Eto. C.
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Journal Title
Proc.of 15tn World Conference of Earthquake Engineering
Volume: (CD-ROM)
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[Journal Article] Template matching method for soil subsidence maps of the areas liquefied in the March 11th off the coast of Tohoku Earthquake2012
Author(s)
Konagai, K., Asakura, T., Suyama, S., Kyokawa, H., Kiyota, T., Eto, C. and Shibuya, K.
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Journal Title
Bulletin of Earthquake Resistant Structure Research Center, Institute of Industrial Science
Volume: 45
Pages: 8-17
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