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Engineering Approach to the Evaluation of Bearing Capacity of Pile Considering the Ground Crushability

Research Project

Project/Area Number 09450182
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Geotechnical engineering
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

OMINE Kiyoshi (1998)  Kyushu Univ., Civil Eng., Research Associate, 工学部, 助手 (60248474)

安福 規之 (1997)  九州大学, 工学部, 助教授 (20166523)

Co-Investigator(Kenkyū-buntansha) SATO Ken-ichi  Fukuoka Univ., Civil Eng., Research Associate, 工学部, 助手 (20235336)
OHNO Shiro  Kyushu Univ., Civil Eng., Research Associate, 工学部, 助手 (70274488)
YASUFUKU Noriyuki  Kyushu Univ., Civil Eng., Associate Professor, 工学部, 助教授 (20166523)
大嶺 聖  九州大学, 工学部, 助手 (60248474)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥13,900,000 (Direct Cost: ¥13,900,000)
Fiscal Year 1998: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1997: ¥12,300,000 (Direct Cost: ¥12,300,000)
KeywordsBEARING CAPACITY / SKIN FRICTION / END BEARING CAPACITY / PARTICLE CRUSHING / COMPRESSIBILITY / INITIAL STRESS / CALCAREOUS SAND / FAILURE MODE
Research Abstract

Crushable sandy soils can be found throughout the world and are characterized very compressible. It have engineering problems of very low bearing capacity and large settlement of the pile foundation in such grounds. In this study, in order to develop a rational geotechnical method for the evaluation of the bearing capacity of pile, it showed the mechanisms of the mobilized bearing capacity. And then the influence of the stress condition and the soil properties on the bearing capacity in sands is discussed based on the theoretical considerations and the experimental results of the individual particle fragmentation tests, the triaxial tests, the ring shear tests and the loading tests of model pile in some types of sand with different crushabilities at various constant stress levels.
The main conclusions obtained are :
(1) Crushable soil particles are generally angular and easy to break as compared with standard geomaterials. The crushable soils have material properties such as high compressibility, large shear modulus and large internal friction angle. And a large deformation is needed to get enough soil strength.
(2) For such soils, the mechanism for the much lower mobilizing bearing capacity of the pile against settlement is clear. The end bearing capacity is caused by the material properties of crushable soils and by the effects of boundary stress around the pile.
(3) The skin friction of the pile with a smooth surface is usually occurred between the pile and the soil on slip failure. At that case it can be expressed by Coulomb's law which is the component of the friction angle and the normal pressure in different crushabilities of sands. On the other hands, it pays attention to estimate the skin friction in the case of large stress ratio.
(4) It can be shown a rational method to evaluate the bearing capacity from the results of(1)-(3).

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (23 results)

All Other

All Publications (23 results)

  • [Publications] N.Yasufuku, H.Ochiai, J.M.Kwag, K.Miyazaki: "Effectiveness of critical state friction angle of volcanic osh soils in design applications" Proceedings of the international symposium on problematic soils, IS-TOHOKU'98. 189-194 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] S.Ohno, H.Ochiai, N.Yasufuku, T.Shimizu, S.Sawada: "Geotechnical Considerations of Skin Friction of Piles in Sands" Proceedings of 13th Southeast Asian Geotechnical conference, Southeast Asian Geotechnical Society. 539-544 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] J.M.Kwag,H.Ochiai,N.Yasufuku,S.Ohno,M.Nakashima: "An Angle of Repose of Weak Sands and Its Evaluation" Proceedings of 13th Southeast Asian Geotechnical conference, Southeast Asian Geotechnical Society. 93-97 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] S.Ohno, H.Ochiai, N.Yasufuku: "Estimation of Pile Settlement in Calcareous Sands" Proceedings of 2nd International Conference on Engineering for Calcareous Sediments, ASCE-SAS. Printing. (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] J.M.Kwag,H.Ochiai,N.Yasufuku,S.Ohno,M.Nakashima: "Yielding Stress Characteristics of Carbonate Sand in Relation to Individual Particle Fragmentation Strength" Proceedings of 2nd International Conference on Engineering for Calcareous Sediments, ASCE.SAS. Printing. (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] N.Yasufuku, J.M.Kwag: "Significance of soil particle fragmentation strength related to soil crushability" 11th Asian Regional Conference, ISSMGE. Accepted. (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] N.Yasufuku, H.Ochiai and Y.Maeda: "Geotechnical Analysis of Skin Friction of Cast-in-Place Piles." Proceedings of 14th International Conference on Soil Mechanics and Fundation Engineering. Vol.2. 921-924 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] N.Yasufuku, H.Ochiai, J.M.Kwag & K.Miyazaki: "Effectiveness of critical state friction angle of volcanic ash soils in design applications." Proceedings of the international symposium on problematic soils, IS-TOHOKU'98. 189-194 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] S.Ohno, H.Ochiai, N.Yasufuku, T.Shimizu and S.Sawada: "Geotechnical Considerations of Skin Friction of Piles in Sands." Proceedings of 13th Southeast Asian Geotechnical conference, Southeast Asian Geotechnical Society. 539-544 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] J.M.Kwag, H.Ochiai, N.Yasufuku, S.Ohno and M.Nakashima: "An Angle of Repose of Weak Sands and Its Evaluation." Proceedings of 13th Southeast Asian Geotechnical conference, SOutheast Asian Geotechnical Society. 93-97 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] S.Ohno, H,Ocniai & N.Yasufuku: "Estimation of Pile Settlement in Calcareous Sands." Proceedings of 2nd International Conference on Engineering for Calcareous Sediments. ASCE-SAS. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] J.M.Kwag, H.Ochiai, N.Yasufuku, S.Ohno & M.Nakashima: "Yielding Stress Characteristics of Carbonate Sand in Relation to Individual Particle Fragmentation Strength." Proceedings of 2nd International Conference on Engineering for Calcareous Sediments. ASCE-SAS. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] S.Ohno & S.Sawada: "Bearing capacity of piles in sands with different crushabilities under various stress conditions." 11th Asian Regional Conference. ISSMGE. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] N.Yasufuku & J.M.Kwag: "Significance of soil particle fragmentation strength related to soil crushability." 11th Asian Regional Conference. ISSMGE. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] N.Yasujuku,H.Ochiai,J.M.Kang,K.Miyazaki: "Eftextiveness of critical state Jriction angle of volcanic ashsoils in design applicotions" Proceedings of the international symposium on problematic soils,IS-TOHKU‘98. 189-194 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] S.Ohno,H.Ochiai,N.Yasuka,T.Himizu. S.Sawada: "Geotechnical Considerations of Skin Friction of Piles in Sands" Proceedings of 13th Soufheast Asior Geotechnical conference,Southeast Asion Geotechnicol Society. 539-544 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] J.M.Kuga,H.Ochiai,N.Yasutuku.S.Ohno M.Nakajima: "An Angle of Repose of Weak Sands and Its Evaluation" Proceedings of 13th Soufheast Asior Geotechnical conference,Southeast Asion Geotechnicol Society. 93-97 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] S.Ohno,H.Ochiai,N.Yasufuku: "Estimation of Pile Settlement in Calcareous Sands" Proceedings of 2th Internationa Conference on Engineering for Calareous Sediments,ASCE-SAS(Printng). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] J.M.Kuang,H.Ochiai,N.Ysufuku S.Ohno M.Nakashima: "Yeilding Stress Characteristics of Carbonate Sand in Relation to Individuol Particle Fragmintation Strength" Proceedings of 2th Internationa Conference on Engineering for Calareous Sediments,ASCE,SAS(Printng). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] N.Yasufuku,J.M.Kung: "Significance of soil particle frgmontation strength related tosoil crusha bility" 11th Asion Regional Conference,IDDMGE. (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 郭 〓敏: "砂の強度パラメーターと破砕性についての一考察" 九州大学工学集報. 第70巻・第4号. 307-314 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 郭 〓敏: "砂の状態量としての単粒子破砕強度について" 九州大学工学部集報. 第71巻・第2号. 95-102 (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 清水敬広: "杭の先端支持力特性に及ぼす初期応力の影響" 九州大学工学部集報. 第71巻・第2号. 103-109 (1998)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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