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Mechanism of shear band formation in Ko-consolidated clayey soil--experimental and theoretical approaches by naked hollow-cylindrical soil specimen--

Research Project

Project/Area Number 02805057
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 基礎・土質工学
Research InstitutionKanazawa university, Dept. of Civil Engineering

Principal Investigator

OHTA Hideki  Kanazawa Univ., Dept. of Civil Engrg., Associate Professor, 工学部, 教授 (80026187)

Co-Investigator(Kenkyū-buntansha) IIZUKA Atsushi  Kanazawa Univ., Dept. of Civil Engrg., Instructor, 工学部, 助手 (40184361)
松本 樹典  金沢大学, 工学部, 助教授 (10143877)
Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1991: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1990: ¥800,000 (Direct Cost: ¥800,000)
KeywordsStrength of material / Stress-strain relation / Shear band formation / ko-consolidation / Compression shear / Strain localization / Elasto-plastic theory / すべり線(面) / 異方圧密粘土 / すべり線 / 負の間隙水圧 / ピ-ク強度 / 歪軟化 / 残留強度 / 3軸試験 / 中空円筒供試体
Research Abstract

The purpose of this research is to give theoretical and experimental bases to capture the failure mechanism of the ground material. The development of localized deformation and its prominence may cause the instability of foundation ground and lead to its failure. Such localized deformation is commonly observed during large deformation of soils, for instance, slip lines observed in the laboratory, the sliding failure of embankment foundation and the fault caused by the orogenic movement. The simulation of shear bands formation may lead to clarify the occurrence mechanism of their phenomena and also make it possible to explain the soil behaviors consistently from the beginning of deformation up to the limit failure state.
In this research, the theoretical basis of bifurcation problem is summarized and classified in regard to the formation of shear band. In particular, the mathematical conditions of the formation of shear band under axisymmetric condition discussed relating to the non-coax … More iality of the elasto-plastic constitutive model for Ko-consolidated clay specimen proposed by Sekiguchi and Ohta (1977). As to experimental study, a new shear test equipment is designed and developed to observe the development of shear band with increase of shear strain in the axisymmetric soil specimen. The distinctive features of it are : 1) able to carry out Ko-consolidation, 2) able to measure Ko-value, 3) able to observe the development of shear bands (slip lines), because a rubber membrane is not used (naked specimen like the unconfined compression test specimen), 4)able to estimate parameters in terms of effective stresses, because the pore water pressure can be measured using measurement system of negative pressure with the ceramic disk.
It was found in this research that the apparent strain-softening stress strain relation in axisymmetric soil specimen is not an essential phenomenum of material but the consequence of inhomogeneous distribution of stress and strain in the specimen as a boundary-value problem. Less

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (31 results)

All Other

All Publications (31 results)

  • [Publications] 坪内 正記,太田 秀樹,飯塚 敦,北 倫彦: "Ko圧密履歴を受けたハダカ中空円筒供試体のせん断試験" 第27回土質工学研究発表会概要集.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 飯塚 敦,太田 秀樹,坪内 正記,北 倫彦: "中実および中空円筒供試体に発生するすべり線について" 第27回土質工学研究発表会概要集.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 小島 謙一,飯塚 敦,太田 秀樹: "せん断帯生成シミュレ-ションにおける有限要素の選択について" 第27回土質工学研究発表会概要集.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Iizuka,A.,Yatomi,C.,Yashima,A.,Sano,I.,and Ohta,H.: "The effect of stress induced anisotropy on shear band formation" Archive of Applied Mechanics.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Ohta,H.: "Embankment and excavation under construction" Proc.9th Asian Regional Conf.Soil Mech. & Foundation Engrg.,Bangkok,. 2. 12 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Ohta,H.: "Role of constitutive model in estimating design strength" Proc.Int.Conf.Geotechnical Engrg for Coastal Development-Theory and Practice on Soft Ground-Geo-Coast '91.2. (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] R. Fukagawa, H. Ohta, A. Iizuka, A. Nishihara & Y. Morita: "Effects of drainage on interpretation of pressuremeter tests in clay." Proc. 3rd Int. Symp. on Pressuremeter, oxford. 189-198 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] M. Shoji, H. Ohta, K. Arai, T. Matsumoto & T. Takahashi: "Two-dimensional consolidation back-analysis." Soils and Foundations. 30, No. 2. 60-78 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] H. Ohta, T. Muta, K. Kaneko, M. Ohtake & A. Iizuka: "Strength of compacted earth fill." Proc. 10th Int. Conf. ISTVS, Kobe. 1123-1128 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] E. Ichimoto, M. Nozu, K. Okuyama, H. Ohta & A. Iizuka: "Strain-softening analysis of composite ground. (in Japanese)" Proc. 35th Symp. Geotechnical Engrg, Tokyo. 39-46 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] H. Ohta: "Specification of mechanical parameters of soft foundations. (in Japanese)" Proc. 35 Symp. Geotechnical Engrg, Tokyo. 65-70 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K. Matsumoto, H. Ohta & A. Kobayashi: "Evaluation of initial stress condition subjected to stress history of soft clay ground. (in Japanese)" Proc. 35th Symp. Geotechnical Engrg, Tokyo. 77-84 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] H. Ohta, K. Ohmori & T. Terada: "Identification of sliding block and stability of discontinuous rock mass. (in Japanese)" Proc. JSCE. No. 424, III-14. 217-225 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] R. Fukagawa, M. Fahey & h. Ohta: "Effect of partial drainage on pressuremeter test in clay." Soils and Foundations. 30, No. 4. 134-146 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] H. Ohta: "Strength obtained by in-situ tests and triaxial tests. (in Japanese)" Proc. Symp. Triaxial Testing Methods, Tokyo. 35-38 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] H. Ohta, A. Iizuka, A. Nishihara, R. Fukagawa & Y. Morita: "Design strength su derived from pressuremeter tests." Proc. 7th Int. Conf. Computer Methods and Advanced in Geomechanics, Cairns. 1. 273-278 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K. Arai, H. Ohta & M. Miyata: "Comparison of static and statistical methods for back-analysis of elastic consolidation problems." Proc. 7th Int. Conf. Computer methods and Advanced in Geomechanics, Cairns. 2. 949-954 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] H. Ohta, A. Iizuka, Y. Mitsuhashi & M. Nabetani: "Deformation analysis of anisotropically consolidated clay foundation loaded by 5 embankments." Proc. 7th Int. Conf. Computer methods and Advanced in Geomechanics, Cairns. 2. 1017-1022 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] E. Ichimoto, M. Nozu, K. Okuyama, A. Iizuka & H. Ohata: "Analysis of post peak behaviour of foundations." Proc. 7th Int. Conf. Computer methods and Advanced in Geomechanics, Cairns. 2. 1165-1170 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] H. Ohta, A. Iizuka, Y. Omote & S. Sugie: "3-D analysis of soil/water coupling problems using elasto-viscoplastic constitutive relationships." Proc. 7th Int. Conf. Computer methods and Advanced in Geomechanics, Cairns. 2. 1191-1196 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] H. Ohta & A. Nishihara: "Parameter determination for soft clay foundations." Proc. int. Conf. Geotechnical Engrg for coastal Development. 1. 51-56 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] H. Ohta, M. Itoh, T. Ishiguro & S. Yonetani: "Precompaction pressure and strength of compacted cohesive soils." Proc. JSCE. No. 436, III-16. 27-36 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] H. Ohta: "Embankment and excavation under construction" Proc. 9th Asian Regional Conf. Soil Mech. & Foundation Engrg, Bangkok. 2. (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] M. Itoh, H. Ohta, T. Ishiguro & S. yonetani: "Precompaction Pressure and strength of compacted soil-gravel mixture" Proc. JSCE. No. 439, III-17. 27-36 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K.スベリセンProc.Int.Conf.Geotechnical Engrg for Coastal DevelopmentーTheory and Practice on Soft GroundーGcoーCoast '91.

    • Related Report
      1991 Annual Research Report
  • [Publications] 坪内 正記,太田 秀樹,飯塚 敦,北 倫彦: "Ko圧密履歴を受けたハダカ中空円筒供試体のせん断試験" 第27回土質工学研究発表会概要集.

    • Related Report
      1991 Annual Research Report
  • [Publications] 飯塚 敦,太田 秀樹,坪内 正記,北 倫彦: "中実および中空円筒供試体に発生するすべり線について" 第27回土質工学研究発表会概要集.

    • Related Report
      1991 Annual Research Report
  • [Publications] 小島 謙一,飯塚 敦,太田 秀樹: "せん断帯生成シミュレ-ションにおける有限要素の選択について" 第27回土質工学研究発表会概要集.

    • Related Report
      1991 Annual Research Report
  • [Publications] Iizuka,A.,Yatomi,C.,Yashima,A.,Sano,I.,and Ohta,H.: "The effect of stress induced anisotropy on shear band formation" Archive of Applied Hechanics.

    • Related Report
      1991 Annual Research Report
  • [Publications] Ohta,H.: "Embankment and excavation under construction" Proc.9th Asian Regional Conf.Soil Hech.& Foundation Engrg.,Bangkok,. 2. 12 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] Ohta,H.: "Role of constitutive model in estimating design stcength" 2. (1991)

    • Related Report
      1991 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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