Various effects on small strain characteristics of gravelly materials

• Project/Area Number: 19760323
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Geotechnical engineering
• Research Institution: Tokyo University of Science
• Principal Investigator: KIYOTA Takashi Tokyo University of Science, 理工学部, 助教 (70431814)
• Project Period (FY): 2007 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥2,640,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥240,000); Fiscal Year 2008: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2007: ¥1,600,000 (Direct Cost: ¥1,600,000)
• Keywords: 土質力学 / 地盤工学 / 三軸試験 / 微小変形特性 / 年代効果 / 礫質土 / 不撹乱試料 / 異方性 / せん断弾性波速度 / せん断剛性率 / S波速度 / ヤング率

Research Abstract

室内試験による供試体の微小変形特性(ひずみレベル10-5程度)の計測は、実地盤の弾性的挙動の把握や地震時の応答解析、液状化特性の検討などに用いられている。本研究では、高品質な不撹乱試料を含む礫質土試料の微小変形特性(静的鉛直ヤング率・動的せん断剛性率)について実験的に検討した。使用した大型三軸試験機(供試体高さ60cm、直径30cm)は、我が国の試験機でも最大級である。結果より、礫質土の微小変形特性に及ぼす応力状態依存性は概ね砂質土の値と同等であった。また、動的に計測された微小変形特性の方が静的なものよりも高い値が得られた。微小変形特性の値は礫質土の締め固め度だけでなく、締め固め時の含水比にも影響することを示した。更に、小型三軸試験機による液状化試験中に礫混じり砂質土の動的せん断剛性率を計測したが、液状化による洪積試料と沖積試料の年代効果の喪失を動的せん断剛性率の変化により表現できることを示した。

Research Products

• [Journal Article] Aging effects on small strain shear moduli and liquefaction properties of in-situ frozen and reconstituted sandy soils (2009)
  • Author(s): Kiyota, T., Koseki, J., Sato, T. and Kuwano, R
  • Journal Title: Soils and Foundations 49 (2)(in print)
  • NAID: 110007327443
  • Peer Reviewed
• [Journal Article] Aging effects on small strain shear moduli and liquefaction properties of in-situ frozen and reconstituted sandy soils (2009)
  • Author(s): Kiyota, T., Koseki, J., Sato, T. and Kuwano, R.
  • Journal Title: Soils and Foundations 49(2)(印刷中)
  • NAID: 110007327443
  • Peer Reviewed
• [Journal Article] Quasi-elastic bulk modulus of sand based on volume change and local deformation measurement of hollow cylindrical specimen (2008)
  • Author(s): De Silva, L.I.N., Koseki, J., Sato. T., Kiyota, T. and Honda, T
  • Journal Title: Deformation Characteristics of Geomaterials, Proc. of the 4th International Symposium on Deformation Characteristics of Geomaterials (Burns, S.E. et al. eds.), Atlanta, USA Pages: 775-781
  • Peer Reviewed
• [Journal Article] Interpreting natural aging effects on liquefaction properties of sands based on small strain characteristics (2008)
  • Author(s): Kiyota, T., Koseki, J. and Sato, T
  • Journal Title: Deformation Characteristics of Geomaterials, Proc. Of the 4th International Symposium on Deformation Characteristics of Geomaterials (Burns, S.E. et al. eds.), Atlanta, USA Pages: 489-494
  • Peer Reviewed
• [Journal Article] Interpreting natural aging effects on liquefaction properties of sands based on small strain characteristics, Deformation Characteristics of Geomaterials (2008)
  • Author(s): Kiyota, T., Koseki, J. and Sato, T.
  • Journal Title: Proc. of the 4^<th> International Symposium on Def ormation Characteristics of Geomaterials Pages: 489-494
  • Peer Reviewed
• [Journal Article] Quasi-elastic bulk modulus of sand based on volume change and local deformation measurement of hollow cylindrical snecimen (2008)
  • Author(s): De Silva, L. I. N., Koseki, J., Sato. T., Kiyota, T. and Honda, T.
  • Journal Title: Proc. of the 4^<th> International Symposium on Def ormation Characteristics of Geomaterials Pages: 775-781
  • Peer Reviewed
• [Journal Article] Small strain stiffness of Toyoura sand obtained from various techniques in IIS (2008)
  • Author(s): Wicaksono, R. I., De Silva, L. I. N., Mulmi, S., Enomoto, T., Kiyota, T., Tsutsumi, Y., Kuwano. R. and Koseki, J
  • Journal Title: 生産研究 60(6) Pages: 561-564
  • NAID: 130000102315
• [Journal Article] トンネル建設現場から採取した不撹乱礫質土の微小変形特性 (2008)
  • Author(s): 榎本忠夫, 佐藤剛司, 古関潤一, 清田隆
  • Journal Title: 第43回地盤工学研究発表会講演集 Pages: 807-808
• [Journal Article] 円礫を主体とする礫質土の変形強度特性に及ぼす締固め条件の影響 (2008)
  • Author(s): 望月一宏, 龍岡文夫, 清田隆, 原大地
  • Journal Title: 第5回地盤工学会関東支部発表会発表講演集 Pages: 283-285
• [Journal Article] 沖積・洪積試料の非排水繰返し載荷に伴う年代効果の消失とせん断剛性率の関係 (2008)
  • Author(s): 清田隆, 古関潤一, 佐藤剛司
  • Journal Title: 第5回地盤工学会関東支部発表会発表講演集 Pages: 243-246
• [Journal Article] Small strain deformation characteristics of granular materials in torsional shear and triaxial tests with local deformation measurements (2007)
  • Author(s): Kiyota, T., De Silva, L. I. N., Sato, T. and Koseki, J.
  • Journal Title: Soil Stress-Strain Behavior: Measurement, Modeling and Analysis Pages: 557-566
  • Peer Reviewed
• [Journal Article] Use of electronic balance in measurement of small volumetric strain of hollow cylinder sand specimens (2007)
  • Author(s): De Silva, L. I. N., Sato, T., Kiyota, T., Honda, T. and Koseki, J
  • Journal Title: Proc. of the 9th International Summer Symposium, JSCE Pages: 167-170
• [Journal Article] 微小変形特性に基づく凍結採取試料の乱れの評価 (2007)
  • Author(s): 清田隆, 古関潤一, 佐藤剛司
  • Journal Title: 第62回土木学会年次学術講演会概要集 III Pages: 267-268
• [Journal Article] Liquefaction resistance and dynamic shear moduli of in-situ frozen and reconstituted sandy soils (2007)
  • Author(s): Kiyota, T., Koseki, J. and Sato, T.
  • Journal Title: Proc. of Earthquake Hazards and Mitigation Pages: 296-302
  • Peer Reviewed
• [Journal Article] Effects of sample disturbance on liquefaction resistance and small strain characteristics of sandy soils (2007)
  • Author(s): Kiyota, T. and Koseki, J.
  • Journal Title: Bulletin of Earthquake Resistant Structure Research Center 40 Pages: 85-97
• [Presentation] 円礫を主体とする礫質土の変形強度特性に及ぼす締固め条件の影響 (2008)
  • Author(s): 望月一宏
  • Organizer: 第5回地盤工学会関東支部発表会
  • Place of Presentation: 千葉
  • Year and Date: 2008-10-31
• [Presentation] 沖積・洪積試料の非排水繰返し載荷に伴う年代効果の消失とせん断剛性率の関係 (2008)
  • Author(s): 清田隆
  • Organizer: 第5回地盤工学会関東支部発表会
  • Place of Presentation: 千葉
  • Year and Date: 2008-10-31
• [Presentation] Quasi-elastic bulk modulus of sand based on volume change and local deformation measurement of hollow cylindrical specimen (2008)
  • Author(s): De Silva, LIN
  • Organizer: 4^<th> International Symposium on Deformation Characteristics of Geomaterials
  • Place of Presentation: アトランタ, USA
  • Year and Date: 2008-09-22
• [Presentation] Interpreting natural aging effects on liquefaction properties of sands based on small strain characteristics, Deformation Characteristics of Geomaterials (2008)
  • Author(s): 清田隆
  • Organizer: 4^<th> International Symposium on Deformation Characteristics of Geomaterials
  • Place of Presentation: アトランタ, USA
  • Year and Date: 2008-09-20
• [Presentation] トンネル建設現場から採取した不撹乱礫質土の微小変形特性 (2008)
  • Author(s): 榎本忠夫
  • Organizer: 第43回地盤工学研究発表会
  • Place of Presentation: 広島
  • Year and Date: 2008-07-09
• [Presentation] トンネル建設現場から採取した不撹乱礫質土の微小変形特性 (2008)
  • Author(s): 榎本忠夫
  • Organizer: 第43回地盤工学研究発表会講演集
  • Place of Presentation: 広島
  • Year and Date: 2008-07-09
• [Presentation] Liquefaction resistance and dynamic shear moduli of in-situ frozen and reconstituted sandy soils (2007)
  • Author(s): 清田隆
  • Organizer: International Workshop on Earthquake Hazards and Mitigation
  • Place of Presentation: インド、グワハティ
  • Year and Date: 2007-12-05
• [Presentation] Use of electronic balance in measurement of small volumetric strain of hollow cylinder sand specimens (2007)
  • Author(s): De Silva, L. L. I. N.
  • Organizer: 9th International Summer Symposium, JSCE
  • Place of Presentation: 横浜
  • Year and Date: 2007-09-18
• [Presentation] 微小変形特性に基づく凍結採取試料の乱れの評価 (2007)
  • Author(s): 清田隆
  • Organizer: 第62回土木学会年次学術講演会
  • Place of Presentation: 広島
  • Year and Date: 2007-09-14