Evaluation of the overall strength of cement-treated soil ground with spatial variability

• Project/Area Number: 22560505
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Geotechnical engineering
• Research Institution: Shibaura Institute of Technology (2011-2012); Kobe City College of Technology (2010)
• Principal Investigator: NAMIKAWA Tsutomu 芝浦工業大学, 工学部, 准教授 (50455151)
• Co-Investigator(Renkei-kenkyūsha): KOSEKI Junichi 東京大学, 生産技術研究所, 教授 (30272511)
• Project Period (FY): 2010 – 2012
• Project Status: Completed (Fiscal Year 2012)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2012: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2011: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2010: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
• Keywords: 土質力学 / 地盤工学 / 地盤改良 / セメント改良土 / ばらつき / 自己相関 / 強度

Research Abstract

Laboratory tests and finite element analyses were conducted to develop the design procedure for evaluating the overall strength of a cement-treated column where strength varies spatially. Unconfined compression tests were mainly carried out for the sample consisting of different strength parts. The comparison between the laboratory and numerical results indicates that the finite element method used in this study can describe the behavior of the cement-treated sample consisting of different strength parts. The finite element analyses are conducted to evaluate the behavior of a full scale column where strength varies spatially. The numerical results suggest that the autocorrelation distance affects significantly the overall strength of the full scale column. The probability of failure of the full scale column for a compression load is calculated from the numerical results.

Research Products

• [Journal Article] Effects of spatial correlation on the compression behavior of a cement-treated column (2013)
  • Author(s): Namikawa T., Koseki J
  • Journal Title: Journal of Geotechnical and Geoenvironmental Engineering, ASCE Volume: 139(8)
  • Peer Reviewed
• [Journal Article] Effects of spatial correlation on compression behavior of cement-treated column (2013)
  • Author(s): Namikawa T.
  • Journal Title: Journal of Geotechnical and Geoenvironmental Engineering Volume: 139
  • Peer Reviewed
• [Journal Article] Numerical study of compression behavior of cement-treated columns with strength fields following normal and lognormal distribution (2012)
  • Author(s): Namikawa T
  • Journal Title: Ground Improvement and Ground Control Volume: 2 Pages: 1193-1200
  • DOI: 10.3850/978-981-07-3560-9_05-0505
  • Peer Reviewed
• [Journal Article] コア強度分布が与えられた条件でのセメント改良柱の圧縮挙動の評価 (2012)
  • Author(s): 並河努
  • Journal Title: 第10回地盤改良シンポジウム論文集 Volume: No.10 Pages: 347-352
  • Peer Reviewed
• [Journal Article] 強度の確率分布がセメント改良柱の一軸圧縮強さに与える影響 (2012)
  • Author(s): 並河努
  • Journal Title: 土木学会論集C Volume: Vol.68, No.4 Pages: 695-706
  • NAID: 130004961951
  • URL: http://dx.doi.org/10.2208/jscejge.68.695
  • Peer Reviewed
• [Journal Article] コア強度分布が与えられた条件でのセメント改良柱の圧縮挙動の評価 (2012)
  • Author(s): 並河努
  • Journal Title: 地盤改良シンポジウム論文集 Volume: 10 Pages: 347-352
  • Peer Reviewed
• [Journal Article] Characterization of strength variability of cement-treated soil column (2012)
  • Author(s): Namikawa T.
  • Journal Title: Proceedings of the 4th Central Asian Geotechnical Symposium Volume: 1 Pages: 172-177
• [Journal Article] Numerical study of failure behavior of cement-treated column with spatial variability (2011)
  • Author(s): Tsutomu Namikawa
  • Journal Title: 14th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering Volume: (CD-ROM)
  • Peer Reviewed
• [Journal Article] Numerical Study of Bending Strength of Cement-treated Column with Spatial Variability (2011)
  • Author(s): Tsutomu Namikawa
  • Journal Title: Proceedings of the International Conference on Advances in Geotechnical Engineering Volume: 1 Pages: 579-586
  • Peer Reviewed
• [Journal Article] ばらつきを有するセメント改良コラムの一軸圧縮強度の統計的特徴 (2010)
  • Author(s): 並河努
  • Journal Title: 第9回地盤改良シンポジウム論文集 Volume: No.9 Pages: 259-264
  • Peer Reviewed
• [Journal Article] ばらつきを有するセメント改良コラムの一軸圧縮強度の統計的考察 (2010)
  • Author(s): 並河努
  • Journal Title: 第9回地盤改良シンポジウム論文集 Volume: 1 Pages: 259-264
  • Peer Reviewed
• [Presentation] Unconfined compression behavior of cement-treated soil sample consisting of different strength parts (2013)
  • Author(s): Namikawa T., Hiyama S., Nakashima Y
  • Organizer: The 2ndInternational Conference on Geotechnics for sustainableDevelopment
  • Place of Presentation: Hanoi, Vietnam
  • Year and Date: 2013-11-28
• [Presentation] セメント改良土の直接一軸引張試験 (2013)
  • Author(s): 檜山将太, 並河努, 谷中祐人, 草薙裕樹
  • Organizer: 土木学会第68回年次学術講演会
  • Place of Presentation: 東京
  • Year and Date: 2013-09-04
• [Presentation] Characterization of strength variability of cement-treated soil column (2012)
  • Author(s): Namikawa T
  • Organizer: Proceedings of the 4th Central Asian Geotechnical Symposium
  • Place of Presentation: Samarkand, Uzbekistan
  • Year and Date: 2012-09-22
• [Presentation] FEM解析による強度のばらつきを有するセメント改良土の一軸圧縮試験のシミュレーション (2012)
  • Author(s): 並河努
  • Organizer: 土木学会第67回年次学術講演会
  • Place of Presentation: 名古屋
  • Year and Date: 2012-09-06
• [Presentation] 強度のばらつきを有するセメント改良土の一軸圧縮試験 (2012)
  • Author(s): 檜山将太, 並河努
  • Organizer: 土木学会第67回年次学術講演会
  • Place of Presentation: 名古屋
  • Year and Date: 2012-09-06
• [Presentation] 強度の確率分布の違いが改良柱の圧縮挙動に与える影響の評価 (2012)
  • Author(s): 並河努
  • Organizer: 第47回地盤工学研究発表会講演集
  • Place of Presentation: 八戸
  • Year and Date: 2012-07-16
• [Presentation] 強度の確率分布の違いが改良柱の圧縮挙動に与える影響の評価 (2012)
  • Author(s): 並河努
  • Organizer: 第47回地盤工学研究発表会講演集
  • Place of Presentation: 八戸工業大学
• [Presentation] 強度のばらつきを有するセメント改良土の一軸圧縮試験 (2012)
  • Author(s): 並河努
  • Organizer: 土木学会第67回年次学術講演会
  • Place of Presentation: 名古屋大学
• [Presentation] FEM解析による強度のばらつきを有するセメント改良土の一軸圧縮試験のシミュレーション (2012)
  • Author(s): 並河努
  • Organizer: 土木学会第67回年次学術講演会
  • Place of Presentation: 名古屋大学
• [Presentation] Numerical Study of Bending Strength of Cement-treated Column with Spatial Variability. (2011)
  • Author(s): Namikawa T
  • Organizer: Proceedings of the International Conference on Advances in Geotechnical Engineering
  • Place of Presentation: Perth, Australia
  • Year and Date: 2011-11-08
• [Presentation] 格子状セメント地盤改良による液状化対策工における部分破壊挙動 (2011)
  • Author(s): 並河努
  • Organizer: 地盤工学会研究発表会
  • Place of Presentation: 神戸
  • Year and Date: 2011-07-07
• [Presentation] Numerical study of compression and tension behaviors of cement-treated column with spatial variability. (2011)
  • Author(s): Namikawa T.
  • Organizer: 14th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering
  • Place of Presentation: Hong Kong
  • Year and Date: 2011-05-24
• [Presentation] 自己相関距離がセメント改良コラムの引張強度特性に与える影響 (2010)
  • Author(s): 並河努
  • Organizer: 地盤工学研究発表会
  • Place of Presentation: 愛媛大学
• [Presentation] 空間自己相関特性がセメント改良コラムの曲げ強度に与える影響 (2010)
  • Author(s): 村上一馬 並河努
  • Organizer: 土木学会全国大会
  • Place of Presentation: 北海道大学