Mechanics of rapid flowing granular materials

• Project/Area Number: 18560482
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Geotechnical engineering
• Research Institution: Saitama University
• Principal Investigator: IWASHITA Kazuyoshi Saitama University, 大学院・理工学研究科, 教授 (40203377)
• Co-Investigator(Kenkyū-buntansha): SUZUKI Kiichi 埼玉大学, 大学院・理工学研究科, 准教授 (70282423)
• Project Period (FY): 2006 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥2,890,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥390,000); Fiscal Year 2008: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2007: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2006: ¥1,200,000 (Direct Cost: ¥1,200,000)
• Keywords: 地盤工学 / 自然災害 / 土砂災害 / 斜面崩壊 / 粒状体 / マイクロメカニクス / 防災

Research Abstract

粒状体斜面が高速流動に移行する課程を高速せん断実験と数値実験により再現した。その結果、粒子からなる微視的構造が崩壊する際に粒子回転が生じる、微視的構造のサイズは流れが遅いと大きくなるが流れの密度の影響は受けない、粒状体斜面の崩壊解析より粗い床面では粒子流の全層で粒子間の衝突や転がりで運動量が消散されるが滑らかな床面では粒子群のなかのある層のみがせん断帯として変形しその内部で粒子回転が卓越していることが確認された

Research Products

• [Journal Article] Measurement of particle dynamics inrapid granular shear flows, Journal ofEngineering Mechanics (2009)
  • Author(s): Mahmood S., Dhakal K. and Iwashita
  • Journal Title: ASCE Volume 135(4) Pages: 285-294
  • Peer Reviewed
• [Journal Article] Measurement of particle dynamics in rapid granular shear flows, (2009)
  • Author(s): Z. Mahmood
  • Journal Title: Journal of Engineering Mechanics, ASCE 135(4) Pages: 285-294
  • Peer Reviewed
• [Journal Article] Detecting collisions and findingcontact durations in experimentalgranular flow, Journal of AppliedMechanics (2008)
  • Author(s): S. Dhakal, K. Iwashita and M. Oda
  • Journal Title: JSCE Volume.11 Pages: 477-486
  • Peer Reviewed
• [Journal Article] Modeling ofmicrostructural evolution to simulateundrained shear strength variation ofKaolin clay (2008)
  • Author(s): Minh N.H., Oda M., Suzuki K. and Kurukulasuriya L.C
  • Journal Title: Journal of AppliedMechanics, JSCE Vol.11 Pages: 389-398
  • Peer Reviewed
• [Journal Article] A constitutive model of sand withinherent transverse isotropy, considering effects of b values (2008)
  • Author(s): Suzuki K., Yanagisawa E. and Odajima M
  • Journal Title: Australian Geomechanics Vol.43, No.4 Pages: 89-98
  • Peer Reviewed
• [Journal Article] Detecting collisions and finding contact durations in experimental granular flow (2008)
  • Author(s): S. Dhakal
  • Journal Title: Journal of Applied Mechanics 11 Pages: 477-486
  • Peer Reviewed
• [Journal Article] Modeling of microstructural evolution to simulate undrained shear strength variation of Kaolin clay (2008)
  • Author(s): Minh, N.H.
  • Journal Title: Journal of Applied Mechanics, JSCE 11 Pages: 389-398
  • Peer Reviewed
• [Journal Article] A constitutive model of sand with inherent transverse isotropy. Considering effects of b values (2008)
  • Author(s): Suzuki, K
  • Journal Title: Australian Geomechanics 43(4) Pages: 89-98
  • Peer Reviewed
• [Journal Article] Simulation of upwardseepage flow behavior using one-columnmodel by DEM taking an interaction withfluid into account (2007)
  • Author(s): K.Suzuki, J.P.Bardet, M.Oda, K.Iwashita, Y.Tsuji, T.Tanaka, T.Kawaguchi
  • Journal Title: J. Geotech. andGeoenvir. Engrg., ASCE Volume 133, Issue 1 Pages: 104-109
  • Peer Reviewed
• [Journal Article] 高速せん断を受ける円盤粒子流に生じるせん断応力の特性 (2007)
  • Author(s): 一場勝幸, 岩下和義, 小田匡寛
  • Journal Title: 土木学会論文集, 土木学会論文集C Vol.63 No.3 Pages: 763-771
  • Peer Reviewed
• [Journal Article] 高速せん断を受ける円盤粒子流に生じるせん断応力の特性 (2007)
  • Author(s): 一場 勝幸, 岩下 和義, 小田 匡寛
  • Journal Title: 土木学会論文集C Vol.63-3 Pages: 763-771
  • Peer Reviewed
• [Journal Article] Simulation of upward seepage flow behavior using one-column model by DEM taking an interaction with fluid into account (2007)
  • Author(s): Suzuki, K, Iwashita, Kら(計7名)
  • Journal Title: J.Geotech.and Geoenvir.Engrg., ASCE 133-1 Pages: 104-109
  • Peer Reviewed
• [Journal Article] Effects of confining pressure on the strength behaviour of granular material simulated by the discrete element method (2007)
  • Author(s): Alim, M. A., Suzuki, K and Iwashita, K.
  • Journal Title: Proceedings of the Tenth Interllational Association for Engineering Geology and the EnVironment Congress (CD-ROM) Pages: 1-4
• [Journal Article] Simulation of upward seepage flow behavior using one-column model by DEM taking an interaction with fluid into account (2007)
  • Author(s): Suzuki, K., Iwashita, K.ら(計7名)
  • Journal Title: J. Geotech. and Geoenvir. Engrg., ASCE, 133-1,
• [Presentation] Discrete element simulation of 1D upward seepage flow with particle-fluid interaction using coupled open source software (2008)
  • Author(s): Chen, F.
  • Organizer: 12th Int. Conf. of International Association for Computer Methods and Advances in Geomechanics
  • Place of Presentation: ゴア、インド
  • Year and Date: 2008-10-05
• [Presentation] Reliability based design safety factorfor soil liquefaction(93-96) (2008)
  • Author(s): Jha S.K., Suzuki K. and Oda M
  • Organizer: Proceedings ofthe Tenth International Summer Symposium
  • Place of Presentation: 埼玉大学
• [Presentation] Effects of confining pressure on thestrength behaviour of granular materialsimulated by the discrete elementmethod (2007)
  • Author(s): Alim M.A., Suzuki K. and Iwashita K
  • Organizer: Proceedings of the TenthInternational AssociationforEngineering Geology and the EnvironmentCongress
  • Place of Presentation: 埼玉大学
  • Year and Date: 2007-09-10