Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Fast Consolidation Test Using Seepage Forces : Method and Validation

침투압을 이용한 급속압밀시험 : 방법 및 검증

  • Published : 2009.04.30
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Abstract

A continuous, fast, and convenient experimental method, replacing recent tests such as standard oedometer or self weight consolidation test, is needed for the determination of the consolidation behavior of unformed soft soils. This study introduced the seepage induced fast consolidation test using the flow pump technique. It can obtain the consolidation characteristics of unformed soft soils conveniently and fast. The seepage induced consolidation test apparatus consists of a modified triaxial cell, differential pressure transducer, flow pump, and displacement transducer. The test continuously proceeds with starting seepage forces induced consolidation, loading consolidation, and permeability test on the same sample. In addition, this test result was compared with the standard oedometer test result to make this method valid. From this study it was found that this method is a convenient and time saving effective method for obtaining data required for calculation of consolidation settlement of unformed soft soils.

최근의 압밀시험(표준압밀시험 또는 자중압밀시험)을 대신하여 성형되는 않은(또는 성형이 불가능한 상태의) 연약한 흙의 압밀거동을 연속적으로 빠르고 편리하게 결정할 수 있는 실험방법이 요구된다. 그래서 본 연구에서는 이와 같은 흙의 압밀 거동을 플로우 펌프에서 발생된 침투압을 이용하여 연속적으로 빠르게 획득할 수 있는 급속압밀실험을 제안하였다. 실험 장치는 삼축셀, 플로우 펌프, 변환기, 데이터처리장치 등으로 구성되고, 실험의 과정은 동일 시료에 대해 침투압에 의한 압밀, 하중재하에 의한 압밀, 압밀 후 투수시험 순으로 연속적으로 진행된다. 또한 본 실험법의 검증을 위해 기존의 표준압밀시험으로부터 얻은 결과와 비교 검토도 이루어졌다. 연구 결과 급속압밀실험법이 연약한 흙의 압밀 침하량 산정에 필요한 데이터를 쉽고 빠르게 산정할 수 있는 방법임을 알 수 있었다.

Keywords

References

  1. 김형주, 오근엽 (1999), "연약한 준설매립 점성토지반의 자중압밀 과정에 관한 연구", 한국지반공학회논문집, 제 15권, 제 2호, pp.129-138
  2. 이범준, 이무천, 이송 (2007), "세립분 함유량에 따른 준설토의 침강 및 자중압밀특성", 한국지반공학회논문집, 제 23권, 제 8호, pp.129-135
  3. Abu-Hejleh, A. N. (1993), "Desiccation theory for soft soils", Ph.D. dissertation, Civil Engineering Department, University of Colorado at Boulder
  4. Abu-Hejleh, A. N. and Znidarcic, D. (1994), "Estimation of the consolidation constitutive relations", Computer Methods and Advances in Geomechanics, Siriwardance & Zaman (eds) Balkema, Rotterdam, pp.499-504
  5. Abu-Hujleh, A. N. and Znidarcic, D. (1995), "Desiccation theory for soft cohesive soils", ASCE Journal of Geotechnical Engineering, Vol.121, No.6, pp.493-502 https://doi.org/10.1061/(ASCE)0733-9410(1995)121:6(493)
  6. Abu-Hejleh, A. N. and Znidarcic, D. (1996), "Consolidation characteristics of phosphatic clays", ASCE Journal of Geotechnical Engineering, Vol.122, No.4, pp.295-301 https://doi.org/10.1061/(ASCE)0733-9410(1996)122:4(295)
  7. Aiban, S. A. and Znidarcic, D. (1989), "Evaluation of the flow pump and constant head technique for permeability measurement"", Geotechnique, Vol.39, pp.655-666 https://doi.org/10.1680/geot.1989.39.4.655
  8. Gibson, R. E., England, G. L., and Hussey, M. J. L. (1967), "The theory of one dimensional consolidation of saturated clays", Geotechnique, Vol.17, No.3, pp.261-273 https://doi.org/10.1680/geot.1967.17.3.261
  9. Gibson, R. E., Schiffman R. L. and Cargill, K. W. (1981), "The theory of one dimensional consolidation of saturated clays II. Finite nonlinear consolidation of thick homogeneous layers", Canadian Geotechnical Journal, Vol.18, pp.280-293 https://doi.org/10.1139/t81-030
  10. Gjerapic, G. and Znidarcic, D. (2000), "Consolidation and desiccation analysis for poplar island site development plan", Baltimore Harbor, Technical Report to Gahagan & Byrant Associates, Inc., by University of Colorado at Boulder
  11. Krizek, R. J. (2004), Slurries in geotechnical engineering, The twelfth Spencer J. Buchanan Lecture, University of Texas at A&M
  12. Kynch, E. J. (1952), "A theory of sedimentation", Transaction of the Faraday Society, Vol.48, pp.168-176 https://doi.org/10.1039/TF9524800166
  13. Leonards, G. A., and Altschaeffl, A. G. (1964), Compressibility of clay, Journal of the Soil Mechanics and Foundation Division, ASCE, 90, SM5, pp.133-155
  14. Liu, J. C. and Znidarcic, D. (1991), "Modeling one-dimensional compression characteristics of soils", ASCE Journal of Geotechnical Engineering, Vol.117, No.1, pp.164-171 https://doi.org/10.1061/(ASCE)0733-9410(1991)117:1(162)
  15. McNabb, A. (1960), "A mathematical treatment of one-dimensional soil consolidation", Quarterly of Applied Mathematics, Vol.17, pp.337-347 https://doi.org/10.1090/qam/113405
  16. Monte, J. L. and Krizek, R. J. (1976), "One-dimensional mathematical model for large-strain consolidation", Geotechnique, Vol.26, pp.495-510 https://doi.org/10.1680/geot.1976.26.3.495
  17. Schmertmann, J. H., 1955, The undisturbed consolidation behavior of clay, Transactions, ASCE, Vol.120, pp.1201-1233
  18. You, Z. (1993), "Flow channeling soft clays and its influence on consolidation", Ph. D. dissertation, Civil Engineering Department, University of Colorado at Boulder
  19. Yao, D.T.C, Oliveira-Filho, W. I., Cai, X. C. and Znidarcic, D. (2002), "Numerical solution for consolidation and desiccation of soft soils", International Journal for Numerical and Analytical Methods in Geomechanics, Vol.26, No.2, pp.139-161 https://doi.org/10.1002/nag.196