Development of permeation grouting using ultra microfine cement for liquefaction mitigation

• Project/Area Number: 17K06563
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Geotechnical engineering
• Research Institution: Tokyo University of Science
• Principal Investigator: Tsukamoto Yoshimichi 東京理科大学, 理工学部土木工学科, 教授 (50253505)
• Co-Investigator(Kenkyū-buntansha): 野田 翔兵 東京理科大学, 理工学部土木工学科, 助教 (30749289) ; 兵動 太一 富山県立大学, 工学部, 講師 (80749078)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2018: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000); Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• Keywords: 液状化対策 / 浸透固化 / 1地盤改良 / 微粒子セメント浸透 / 地盤の細粒分 / 浸透促進 / 改良体形状 / 液状化 / 地盤改良 / セメント / 細粒分 / 浸透

Outline of Final Research Achievements

Permeation grouting by means of microfine cement was examined as a countermeasure against soil liquefaction. Multiple series of laboratory tests were conducted to investigate the possible range of soil conditions that this grouting method can be used as well as the optimum injection criteria. This grouting method is found to be applicable for sand deposits having fines content of up to Fc = 25%. For such silty sand deposits, the use of water permeation following the microfine cement grouting was found to work as a good facilitator, and the process of cement and water permeation was monitored to disclose the mechanism and effectiveness of the use of water permeation. The re-injection of microfine cement following this water permeation was also examined and worked well. For sand deposits containing many fines, the optimum value of cement concentration was found to be w/c = 8, based on the results of the series of laboratory tests that have observed the volume and shape of grouted soils.

Academic Significance and Societal Importance of the Research Achievements

2011年東日本大震災を受けて、社会基盤施設のみならず、戸建て住宅などの小規模構造物の液状化対策技術の開発が急務となってきている。さまざまな用途に応じることができる、多様な技術の開発が期待されている。本研究では、既設小規模構造物に適用が期待される極超微粒子セメントを利用した浸透固化技術について検討を加え、その適用可能な地盤条件や最適な注入条件の模索を実施し、提示することができた。
今後は、最近の地震被害が目立ち始めている火山灰質土による埋め立て地盤などへの適用の可否について検討を加えていくことが望まれる。

Research Products

• [Journal Article] Examining strength characteristics of improved soil by permeation grouting of ultra microfine cement for soil liquefaction countermeasure (2019)
  • Author(s): Hashimoto, K., Hyodo, T., Tsukamoto, Y. and Arai, Y.
  • Journal Title: Proceedings of International Conference on Earthquake Geotechnical Engineering Volume: 印刷中
  • Peer Reviewed
• [Presentation] 細粒分を多く含む砂質地盤の室内三次元浸透固化実験 (2019)
  • Author(s): 王サイ・野田翔兵・塚本良道
  • Organizer: 地盤工学会関東支部発表会講演集
• [Presentation] 極超微粒子セメント注入材の浸透促進効果の検討 (2018)
  • Author(s): 橋本和佳、王維弘、塚本良道、兵動太一、荒井靖仁、木内浩二
  • Organizer: 第53回地盤工学研究発表会
• [Presentation] 室内三次元注入試験における極超微粒子セメント注入材の浸透性 (2018)
  • Author(s): 王維弘、橋本和佳、兵動太一、塚本良道
  • Organizer: 第53回地盤工学研究発表会
• [Presentation] Building up design basis for permeation grouting using ultra microfine cement to locally countermeasure against soil liquefaction (2017)
  • Author(s): Hashimoto, K., Wang, W., Hyodo, T., Tsukamoto, Y., Nishihara, S., Oji, S., Nishie, S.,Seko, I.
  • Organizer: Proceedings of International Conference on Performance-based Design in Earthquake Geotechnical Engineering, Vancouver, July 16 to 20, 2017
  • Int'l Joint Research
• [Presentation] 液状化対策のための極超微粒子セメントを用いた浸透固化工法における固化特性について (2017)
  • Author(s): 橋本和佳・西原聡・王寺秀介・西江俊作・王維弘・塚本良道・兵動太一・金沢智彦
  • Organizer: 第52回地盤工学研究発表会
• [Presentation] 高水セメント比の極超微粒子セメント注入材を用いた室内浸透試験 (2017)
  • Author(s): 王維弘・橋本和佳・塚本良道・兵動太一・梶原沢・宇田川幹
  • Organizer: 第52回地盤工学研究発表会