Optimum geosynthetic-reinforcement effect for unsaturated soil structures and evaluation of quality change with time

2004 Fiscal Year Final Research Report Summary

• Project/Area Number: 15560425
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Geotechnical engineering
• Research Institution: Kobe University
• Principal Investigator: IIZUKA Atsushi Kobe University, Associate Professor, 都市安全研究センター, 助教授 (40184361)
• Project Period (FY): 2003 – 2004
• Keywords: shear deformation / dilatancy / unsaturated soils / maintenance / soil / water coupled problem / strength / F.E.simulation

Research Abstract

The modeling of the composite soil-geosynthetic structure is presented and the effect of the reinforcement arising from the confining of the deformation of the soil by geosynthetics is descussed. A series of compressive shear tests for compacted sandy soil specimens, wrapped in geosynthetics, is carried out for the purpose of quantitatively examining the effect of the geosynthetic reinforcement arising from the confining of the deformation of compacted soils during shearing. Furthermore, an elasto-plastic modeling for compacted soil and a rational determination procedure for input parameters, needed in the elasto-plastic modeling, are presented. Then, the subloading yielding surface is introduced to the elasto-plastic modeling in order to describe the irreversible deformation characteristics of compacted soil during shearing. Since compacted soil is essentially unsaturated and its mechanical behavior is influenced by the suction working in the compacted soil media, the suction effect is taken into account in estimating of the degree of compaction. Finally, an elasto-plastic finite element simulation is conducted and the geosynthetic-reinforcement effect is presented.

Research Products

• [Journal Article] Changes in the instantaneous shear modulus of normally consolidated clay with shear history (2005)
  • Author(s): Iizuka, A., Tachibana, S., Kawai, K., Ohta, H.
  • Journal Title: Soils and Foundations Vol.45, No.2(in printing)
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Elasto-plastic constitutive equation to describe re-liquefaction phenomenon, in the book of Dislocations, Plasticity, Damage and Metal Forming : Material Response and Multiscale Modeling (2005)
  • Author(s): Ohno, S., Iizuka, A., Kawai, K., Ohta, H.
  • Journal Title: Proc.of PLASTICITY'05 : the 11^<th> International Symposium on Plasticity and its Current Applications(edited by A.S.Khan, A.R.Khoei) Pages: 286-288
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] The non-coaxiality induced by stress rate on the instantaneous shear modulus of clays, in the book of Dislocations, Plasticity, Damage and Metal Forming : Material Response and Multiscale Modeling, Key-note-lecture (2005)
  • Author(s): Iizuka, A., Tachibana, S., Kawai, K., Ohta, H.
  • Journal Title: Proc.of PLASTICITY'05 : the 11^<th> International Symposium on Plasticity and its Current Applications(edited by A.S.Khan, A.R.Khoei) Pages: 265-267
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Modeling of the confining effect due to the geosynthetic wrapping of compacted soil specimens (2004)
  • Author(s): Iizuka, A.
  • Journal Title: Journal of Geotextiles and Geomembranes, Elsevier Vol.22, No.5 Pages: 329-358
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] 土構造物の維持補修への構成式の応用 (2004)
  • Author(s): 石井 武司
  • Journal Title: 土と基礎,地盤工学会 Vol.52, No.8 Pages: 25-27
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] 既存の不飽和土構成モデルの解釈および水分特性曲線ヒステリシスを考慮したモデルの一般的な表現方法 (2004)
  • Author(s): 河井 克之
  • Journal Title: 応用力学論文集(土木学会) Vol.7, No.1 Pages: 505-513
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Modeling of the confining effect due to the geosynthetic wrapping of compacted soil specimens (2004)
  • Author(s): Iizuka, A., Kawai, K., Kim, E.R., Hirata, M.
  • Journal Title: Journal of Geotextiles and Geomembranes(Elsevier) Vol.22, No.5 Pages: 329-358
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] The role of numerical simulation for geosynthetic reinforced soil structures - from laboratory tests to full scale structures -, GeoAsia2004 (2004)
  • Author(s): Iizuka, A., Hirata, M., Ohta, H., Kawai, K., Yokota, Y.
  • Journal Title: Invited Lecture at ISSMGE TC9 Sponsored Session, Proceedings of the 3rd Asian regional Conference on Geosynthetics, Seoul, Korea Pages: 153-172
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Modeling of the confining effect due to the geosynthetics wrapping of compacted soil specimen considering suction effect, GeoAsia2004 (2004)
  • Author(s): Kim, E.R., Kim, Y.S., Iizuka, A, Kawai, K.
  • Journal Title: Proceedings of the 3^<rd> Asian regional Conference on Geosynthetics, Seoul, Korea, June Pages: 707-714
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] 'Safety and Symbiosis' from viewpoint of geomechanics (2004)
  • Author(s): Iizuka, A., Kawai, K., Wang, W.
  • Journal Title: Proc.KU-UW International Symposium #1 on Design Strategy towards Safety and Symbiosis of Urban Space, Seattle, USA, June 14-15 Pages: 81-88
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Mechanical behavior of partly saturated ground considering the effect of evaporation and transpiration (2004)
  • Author(s): Iizuka, A., Kawai, K., Wang, W.
  • Journal Title: Proc.of the International Symposium on Numerical Simulation of Environmental Problems, Okayama (in printing)
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Numerical interpretation of a shape of yield surface obtained from stress probe tests (2003)
  • Author(s): Kobayashi, I.
  • Journal Title: Soils and Foundations, JGS Vol.43, No.3 Pages: 95-104
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] 施工履歴の違いを考慮したCAES地下空洞掘削シミュレーション (2003)
  • Author(s): 西田 博文
  • Journal Title: 応用力学論文集(土木学会) Vol.6 Pages: 1131-1139
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Deformation analysis of soft subsoil on sloping bedrock loaded by highway embankment with stabilization methods (2003)
  • Author(s): Iizuka, A.
  • Journal Title: Soils and Foundations, JGS Vol.43, No.5 Pages: 81-92
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Numerical interpretation of a shape of yield surface obtained from stress probe tests (2003)
  • Author(s): Kobayashi, I., Soga, K., Iizuka, A., Ohta, H.
  • Journal Title: Soils and Foundations, JGS Vol.43, No.3 Pages: 95-104
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Deformation analysis of soft subsoil on sloping bedrock loaded by highway embankment with stabilization methods (2003)
  • Author(s): Iizuka, A., Yamamoto, N., Sueoka, M., Satou, N., Kawaida, M., Ohta, H.
  • Journal Title: Soils and Foundations, JGS Vol.43, No.5 Pages: 81-92
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] The deformation and the moisture characteristics of unsaturated soils under isotropic loading and undrained condition (2003)
  • Author(s): Kawai, K., Wang, W., Sakurai, K., Iizuka, A.
  • Journal Title: Proc.of 2^<nd> Asian Conference on Unsaturated Soils Pages: 171-176
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] A study of the relation between volume change characteristics of compacted soil and the condition of compaction (2003)
  • Author(s): Honda, M., Seguchi, H., Kim, E., Kawai, K., Iizuka, A., Karube, D.
  • Journal Title: Proc.of 2^<nd> Asian Conference on Unsaturated Soils Pages: 177-180
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Estimation of the consolidated yielding stress of compacted soil considering the effects of suction (2003)
  • Author(s): Kim, E., Kawai, K., Iizuka, A.
  • Journal Title: Proc.of 2^<nd> Asian Conference on Unsaturated Soils Pages: 271-276
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Computational soil/water coupled unsaturated soil behavior (2003)
  • Author(s): Iizuka, A., Kawai, K., Nishida, H., Honda, M., Karube, D.
  • Journal Title: Proc.of 2^<nd> Asian Conference on Unsaturated Soils Pages: 299-304
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Suction change of compacted soils during static compaction test (2003)
  • Author(s): Kawai, K., Nagareta, H., Hagiwara, M., Iizuka, A.
  • Journal Title: Proc.of 2^<nd> Asian Conference on Unsaturated Soils Pages: 429-434
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Numerical assessment of long term non-uniform settlement of man-made island (2003)
  • Author(s): Iizuka, A., Kawai, K., Nishida, H.
  • Journal Title: Proc.of 13^<th> European Conference on Soil Mechanics and Geotechnical Engineering, Prague Vol.1 Pages: 709-712
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Influence of water level change on the behavior of unsaturated zone (2003)
  • Author(s): Kawai, K., Iizuka, A., Umehara, H., Wang, W., Kato, S.
  • Journal Title: Proc.of 13^<th> European Conference on Soil Mechanics and Geotechnical Engineering, Prague Vol.1 Pages: 735-738
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Undrained strength measured in lab/in-situ tests and strength mobilized at failure in the field (2003)
  • Author(s): Ohta, H., Nishihara, A., Iizuka, A.
  • Journal Title: Proc.of JSPS Core University Program on Environmental Engineering Symposium, 8-9 August 2003, The Peninsula Manila, Makati City, Metro Manila, Philippines Pages: 391-408
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Soil/water coupled response to repeated loading (2003)
  • Author(s): Ohno, S., Iizuka, A., Ohta, H.
  • Journal Title: Proc.of JSPS Core University Program on Environmental Engineering Symposium, 8-9 August 2003, The Peninsula Manila, Makati City, Metro Manila, Philippines Pages: 381-390
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] 15 years continuous settlement of a highway embankment on very soft clay, Keynote Lecture (2003)
  • Author(s): Ohta, H, Iizuka, A., Inagaki, M., Nozu, M., Takeyama, T.
  • Journal Title: Proc.of International Workshop on Geotechnics of Soft Soils, Theory and Practice, Noordwijkerhout Pages: 49-62
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] The change of instantaneous shear modulus associated with non-coaxiality of normally consolidated clays (2003)
  • Author(s): Iizuka, A., Tachibana, S., Kawai, K., Ohta, H.
  • Journal Title: Proc.of the International Workshop on Prediction and Simulation Methods in Geomechanics (IWS-Athens 2003), Athens, Greece Pages: 21-24
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Constitutive parameters of compacted sandy soils (2003)
  • Author(s): Iizuka, A., Hirata, M., Ohta, H.
  • Journal Title: Proc.of 13^<th> Regional Conference for Africa, The Involvement of Geotechnical Engineering in Infrastructure development in Africa(Editors : Sahli, M., Bahi, L., Khalid, R) Pages: 713-719
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Influence of ground improvement on the quality of man-made islands
  • Author(s): Iizuka, A, Kawai, K., Nishida, H.
  • Journal Title: Proc.11^<th> International Association for Computer Methods and Advances in Geomechanics (accepted)
  • Description: 「研究成果報告書概要(欧文)」より