Development of cost effective liquefaction countermeasure technique by air injection and evaluation of its impact to on geo-environment.

• Project/Area Number: 21360226
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Geotechnical engineering
• Research Institution: Ehime University
• Principal Investigator: OKAMURA Mitsu 愛媛大学, 大学院・理工学研究科, 教授 (50251624)
• Co-Investigator(Kenkyū-buntansha): YASUHARA Hideaki 愛媛大学, 大学院・理工学研究科, 准教授 (70432797)
• Project Period (FY): 2009 – 2012
• Project Status: Completed (Fiscal Year 2012)
• Budget Amount: ¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000); Fiscal Year 2012: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000); Fiscal Year 2011: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2010: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000); Fiscal Year 2009: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
• Keywords: 液状化 / 液状化対策 / 不飽和 / 飽和度 / 遠心模型実験 / 三軸試験 / 設計法

Research Abstract

Objective of this research is to develop a cost effective liquefaction countermeasure technique by air injection and to propose a design and execution manual. The following items are in particularly studied.
(1) Mechanism of instability of existing structures when foundation soil immediately below the structures is desaturated.
(2) Evaluation of effectiveness to reduce deformation and settlement during strong base shaking.
(3) Relationship between liquefaction strength ration and volumetric strain for silt and silt mixed sand.
(4) A design and execution manual is published.

Research Products

• [Journal Article] Seismic stability of embankments subjected to pre-deformation due to foundation consolidation (2013)
  • Author(s): Mitsu Okamura 他
  • Journal Title: Soils and Foundations Volume: Vo. 53, No. 1 Issue: 1 Pages: 11-33
  • DOI: 10.1016/j.sandf.2012.07.015
  • Peer Reviewed
• [Journal Article] Experiments and predictions of physical properties of sand cemented by enzymatically-induced carbonate precipitation (2012)
  • Author(s): Hideaki Yasuhara, Mitsu Okamura 他 2名
  • Journal Title: Soils and Foundations Volume: Vol. 52, No. 3 Issue: 3 Pages: 539-549
  • DOI: 10.1016/j.sandf.2012.05.011
  • Peer Reviewed
• [Journal Article] 新しい液状化対策技術－空気注入不飽和化工法（Air-Des 工法）－ (2012)
  • Author(s): 岡村未対
  • Journal Title: 地盤工学会誌 Volume: 60(5) Pages: 12-15
  • NAID: 110009444805
• [Journal Article] In-Situ Desaturation Test by Air Injection and Its Evaluation through Field Monitoring and Multiphase Flow Simulation (2011)
  • Author(s): Mitsu Okamura,Hideaki Yasuhara 他6名
  • Journal Title: JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING, ASCE Volume: Vo.137, No. 6 Pages: 643-652
  • Peer Reviewed
• [Journal Article] Seismic stability of embankment on soft soil deposit (2011)
  • Author(s): M, Okamura and S. Tamamura
  • Journal Title: Int. J. Physical Modelling in Geotechnics Volume: Vol. 11 Pages: 1-8
  • Peer Reviewed
• [Journal Article] In-Situ Desaturation Test by Air Injection and Its Evaluation through Field Monitoring and Multiphase Flow Simulation (2011)
  • Author(s): Mitsu Okamura, 他7名
  • Journal Title: JOUENAL OF GEOTECHNICAL AND GEOENVI RONMENTAL ENGINEERING, ASCE Volume: Vo.137,No.7 Issue: 7 Pages: 643-652
  • DOI: 10.1061/(asce)gt.1943-5606.0000483
  • Peer Reviewed
• [Journal Article] Seismic stability of embankment on soft soil deposit (2011)
  • Author(s): M, Okamura, S, Tamamura
  • Journal Title: Int.J.Physical Modelling in Geotechnics Volume: 11 Pages: 1-8
  • Peer Reviewed
• [Journal Article] Preparation of fully saturated model ground (2010)
  • Author(s): M. Okamura and T. Inoue
  • Journal Title: Proc. Int. Conf. Physical Modelling in Geotechnics Volume: Vol. 1 Pages: 147-152
  • Peer Reviewed
• [Journal Article] Preparation of fully saturated model ground (2010)
  • Author(s): M.Okamura, T.Inoue
  • Journal Title: Proc.Int.Conf.Physical Modelling in Geotechnics Volume: 1 Pages: 147-152
  • Peer Reviewed
• [Presentation] Remedial Measure for Highway Embankments on Liquefaction Prone Foundation (2012)
  • Author(s): Mitsu Okamura
  • Organizer: 2nd Int. Conf. on Performance＿Based Design in Earthquake
  • Place of Presentation: タロマニア（イタリア）
• [Presentation] Centrifuge Tests on Seismic Behavior of Spread Foundation on Liquefiable Soil with (2012)
  • Author(s): Narayan Marasini
  • Organizer: 平成24 年度地盤工学会四国支部技術研究発表会
  • Place of Presentation: 喜多郡内子町
• [Presentation] 道路盛土直下への空気注入による液状化対策効果の実験的検討 (2012)
  • Author(s): 冨田雄一
  • Organizer: 第47回地盤工学研究発表会
  • Place of Presentation: 八戸市
• [Presentation] 空気注入不飽和化工法の現地実証実験 その1：徳島県鳴門市での実験概要 (2012)
  • Author(s): 岡田克寛
  • Organizer: 第47回地盤工学研究発表会
  • Place of Presentation: 八戸市
• [Presentation] 空気注入不飽和化工法の現地実証実験 その2：注入孔間隔の検討 (2012)
  • Author(s): 山浦昌之
  • Organizer: 第47回地盤工学研究発表会
  • Place of Presentation: 八戸市
• [Presentation] 空気注入不飽和化工法の現地実証実験 その3：注入空気のモニタリング (2012)
  • Author(s): 新川直利
  • Organizer: 第47回地盤工学研究発表会
  • Place of Presentation: 八戸市
• [Presentation] 空気注入不飽和化工法の現地実証実験 その4：事後調査 (2012)
  • Author(s): 藤井直
  • Organizer: 第47回地盤工学研究発表会
  • Place of Presentation: 八戸市
• [Presentation] 空気注入不飽和化工法の現地実証実験 その5：千葉県袖ケ浦市での実験概要 (2012)
  • Author(s): 太田正規
  • Organizer: 第47回地盤工学研究発表会
  • Place of Presentation: 八戸市
• [Presentation] 空気注入不飽和化工法の現地実証実験 その6：千葉県袖ケ浦市での実験結果 (2012)
  • Author(s): 三枝弘幸
  • Organizer: 第47回地盤工学研究発表会
  • Place of Presentation: 八戸市
• [Presentation] 空気注入不飽和化工法を適用した場合の耐震補強工法 (2012)
  • Author(s): 曽根照人
  • Organizer: 第47回地盤工学研究発表会
  • Place of Presentation: 八戸市
• [Presentation] 空気注入不飽和化工法の開発 その1：現地実験（徳島県鳴門市）の概要 (2012)
  • Author(s): 岡田克寛
  • Organizer: 土木学会第67回年次学術講演会
  • Place of Presentation: 名古屋市
• [Presentation] 空気注入不飽和化工法の開発 その3：注入口配置に関する解析検討 (2012)
  • Author(s): 山浦昌之
  • Organizer: 土木学会第67回年次学術講演会
  • Place of Presentation: 名古屋市
• [Presentation] 空気注入不飽和化工法の開発 その4：空気注入とそのモニタリング (2012)
  • Author(s): 新川直利
  • Organizer: 土木学会第67回年次学術講演会
  • Place of Presentation: 名古屋市
• [Presentation] 空気注入不飽和化工法の開発 その8：設計法の概要 (2012)
  • Author(s): 小泉勝彦
  • Organizer: 土木学会第67回年次学術講演会
  • Place of Presentation: 名古屋市
• [Presentation] 道路盛土直下への空気注入による液状化対策効果の実験的検討 (2012)
  • Author(s): 冨田雄一
  • Organizer: 土木学会第67回年次学術講演会
  • Place of Presentation: 名古屋市
• [Presentation] 地盤の不飽和化が地震時の過剰間隙水圧の発生と地盤の変形に及ぼす影響 (2012)
  • Author(s): 岡本辰也
  • Organizer: 土木学会第67回年次学術講演会
  • Place of Presentation: 名古屋市
• [Presentation] In-Situ Air Injection as a Liquefaction Countermeasure (2011)
  • Author(s): M. Okamura
  • Organizer: Proceedings of the International Geotechnical Symposium
  • Place of Presentation: ハバロフスク,ロシア
  • Year and Date: 2011-07-27
• [Presentation] Centrifuge Tests on Effects of Soil Desaturation as a Liquefaction Countermeasure on Embankment Settlement (2011)
  • Author(s): T. Okamoto and M. Okamura
  • Organizer: Proceedings of the International Geotechnical Symposium
  • Place of Presentation: ハバロフスク,ロシア
  • Year and Date: 2011-07-27
• [Presentation] In-Situ Air Injection as a Liquefaction Countermeasure (2011)
  • Author(s): M.Okamura
  • Organizer: Proceedings of the International Geotechnical Symposium
  • Place of Presentation: ロシア・ハバロフスク(招待講演)
  • Year and Date: 2011-07-26
• [Presentation] Centrifuge Tests on Effects of Soil Desaturation as a Liquefaction Countermeasure on Embankment Settlement (2011)
  • Author(s): T.Okamoto, M.Okamura
  • Organizer: Proceedings of the International Geotechnical Symposium
  • Place of Presentation: ロシア・ハバロフスク
  • Year and Date: 2011-07-26
• [Presentation] 塑性のある細粒分を含む不飽和砂質土の液状化強度特性 (2011)
  • Author(s): 竹上和希・岡村未対
  • Organizer: 第46回地盤工学研究発表会
  • Place of Presentation: 神戸
  • Year and Date: 2011-07-07
• [Presentation] 地盤の不飽和化が液状化地盤上の盛土の沈下量に及ぼす影響 (2011)
  • Author(s): 岡本辰也・岡村未対
  • Organizer: 第46回地盤工学研究発表会
  • Place of Presentation: 神戸
  • Year and Date: 2011-07-05
• [Remarks]
  • URL: http://www.cee.ehime-u.ac.jp/~gm/Air-des.html
• [Remarks] 地盤マネジメント研究室
  • URL: http://www.cee.ehime-u.ac.jp/~gm/
• [Remarks]
  • URL: http://www.cee,ehime-u.ac.jp/~gm/
• [Patent(Industrial Property Rights)] 空気注入による地盤の飽和度の計測方法 (2009)
  • Inventor(s): 神宮司元治,岡村未対,西垣誠,武林昌哉,武藤雅俊,藤井直,今里武彦
  • Filing Date: 2009-11-12