Evaluation of extent of damage of soil structure and its repair

• Project/Area Number: 16H04406
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Geotechnical engineering
• Research Institution: Saitama University
• Principal Investigator: Kuwano Jiro 埼玉大学, 理工学研究科, 教授 (30178149)
• Project Period (FY): 2016-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥18,200,000 (Direct Cost: ¥14,000,000、Indirect Cost: ¥4,200,000); Fiscal Year 2019: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2018: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2017: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000); Fiscal Year 2016: ¥12,350,000 (Direct Cost: ¥9,500,000、Indirect Cost: ¥2,850,000)
• Keywords: 補強土壁 / 被災度評価 / ジオグリッド / ネイリング / 地震 / 壁面傾斜 / すべり面 / 耐震性 / 損傷度 / 補修 / 土構造物 / 修復 / 壁面パネル / 地盤防災 / レジリエンス

Outline of Final Research Achievements

This study focuses on the assessment of seismic stability of geogrid reinforced soil walls using a vertical wall and inclined wall to simulate initial damage. The walls were tilted or shaken to be damaged and finally collapsed. From the deformation of the facing panels and distribution of strain in the backfill, it was found that the increment of tilting angle of facing panel could be a good index to estimate stability of the geogrid reinforced wall. Shaking table tests on MSE/Soil nailed hybrid reinforced soil retaining walls were then carried out. It was shown that the nailing was effective to increase stability of dmaged reinforced soil wall.

Academic Significance and Societal Importance of the Research Achievements

安定性が高いことから、道路盛土構築に際して近年使用されることが多い補強土壁構造であるが、大地震や大雨などの過大な外力が作用した場合に、ある程度損傷を受けることがある。被災後速やかに被災度を評価することは、交通の確保や速やかな復旧へとつながる。また追加的な補修を行うことで十分な安定性が確保できれば、速やかな復旧を経済的に行うことができる。本研究では補強土壁の安定性指標と追加補強法について検討を行い成果を得た。

Research Products

• [Journal Article] SEISMIC BEHAVIOUR OF GEOGRID REINFORCED SOIL WALL CONSTRUCTED WITH MULTIPLE REINFORCEMENT STIFFNESS (2019)
  • Author(s): AJUDA Albano、KUWANO Jiro、HOSHINA Kosuke
  • Journal Title: Geosynthetics Engineering Journal Volume: 34 Issue: 0 Pages: 129-136
  • DOI: 10.5030/jcigsjournal.34.129
  • NAID: 130007831191
  • ISSN: 1344-6193, 1883-146X
  • Peer Reviewed / Open Access
• [Journal Article] Evaluation of seismic stability of an initially tilted geogrid reinforced soil wall (2018)
  • Author(s): Ajuda, A.A., Kuwano, J., Takamine, S. and Yasukawa, K.
  • Journal Title: ジオシンセティックス論文集 Volume: 33 Pages: 9-14
  • NAID: 130007644826
  • Peer Reviewed / Open Access
• [Journal Article] Effects of overburden on behavior of confined-reinforced earth under differential settlement (2017)
  • Author(s): Ho, M.H., and Kuwano, J.
  • Journal Title: ジオシンセティックス論文集 Volume: 32 Pages: 39-44
  • Peer Reviewed
• [Presentation] Shaking table test on seismic performance of geogrid reinforced soil wall (2019)
  • Author(s): Ajuda, A.A., Kuwano, J., Takamine, S. and Yasukawa, K.
  • Organizer: 7th International Conference on Earthquake Geotechnical Engineering
  • Int'l Joint Research
• [Presentation] Effect of reinforcement stiffness arrangement on seismic performance of geogrid reinforced soil wall (2019)
  • Author(s): Ajuda, A.A., Kuwano, J. and Hoshina, K.
  • Organizer: 5th International Conference on Science, Engineering & Environment
  • Int'l Joint Research
• [Presentation] Effect of Reinforcement stiffness arrangement in the performance of segmental geogrid reinforced soil wall under seismic loading (2019)
  • Author(s): Ajuda, A.A., Kuwano, J. and Hoshina, K.
  • Organizer: 第54回地盤工学研究発表会
• [Presentation] Shaking table tests on effecte of reinforcement stiffness on seismic stability of geogrid reinforced soil walls (2019)
  • Author(s): Kuwano, J. and Ajuda, A.A.
  • Organizer: 18th International Symposium on New Technologies for Urban Safety of Mega Cities in Asia
  • Int'l Joint Research
• [Presentation] Effect of lateral confining condition of behaviour of confined-reinforced earth (2018)
  • Author(s): Ho, M.H., and Kuwano, J.
  • Organizer: 9th International Conference on Physical Modelling in Geotechnics
  • Int'l Joint Research
• [Presentation] Confining tie rods in confined-reinforced earth method to reduce differential settlement (2018)
  • Author(s): Ho, M.H., Kuwano, J. and Tachibana, S.
  • Organizer: 11th International Conference on Geosynthetics
  • Int'l Joint Research
• [Presentation] 予め壁面を傾斜させた補強土壁の地震時被災度評価 (2018)
  • Author(s): 高嶺周平，桑野二郎, Ajuda, A.A.
  • Organizer: 第53回地盤工学研究発表会
• [Presentation] 傾斜実験による補強土壁の破壊モードと震度法の検討 (2017)
  • Author(s): 高嶺周平, 桑野二郎
  • Organizer: 第14回地盤工学会関東支部発表会