Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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A Study on the Characteristics of Stress History of Kwang-Yang Port Clayey Soil Based on the Long-term Consolidation Test

장기압밀시험에 의한 광양항 점성토의 응력이력 특성 연구

  • Kim, Jin-Young (Dept. of Rural & Bio-Systems Engrg. Chonnam National Univ.) ;
  • Ryu, Seung-Seok (Dept. of Civil Engrg. Chonnam National Univ.) ;
  • Baek, Won-Jin (Dept. of Rural & Bio-Systems Engrg. Chonnam National Univ.) ;
  • Shim, Jae-Rok (Dept. of Rural & Bio-Systems Engrg. Chonnam National Univ.) ;
  • Oh, Jong-Shin (Dept. of Civil Engrg. Chonnam National Univ.) ;
  • Kim, Seong-Gon (Dept. of Civil Engrg. Chonnam National Univ.)
  • 김진영 (전남대학교 지역.바이오시스템공학과) ;
  • 류승석 (전남대학교 토목공학과) ;
  • 백원진 (전남대학교 지역.바이오시스템공학과) ;
  • 심재록 (전남대학교 지역.바이오시스템공학과) ;
  • 오종신 (전남대학교 토목공학과) ;
  • 김승곤 (전남대학교 토목공학과)
  • Received : 2011.09.30
  • Accepted : 2012.06.04
  • Published : 2012.06.29
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Abstract

In this present study, the long-term consolidation tests were performed using the remolded Kwang-Yang port clayey soil to clarify the effect of stress history and over-consolidation ratio (OCR) on the long-term consolidation characteristics of the soft clayey soil. For the over-consolidated state clayey soils, in case OCR exceeds 1.5, there are no great differences of secondary consolidation settlement and final settlement even if OCR increases from 2.0 to 3.0. Therefore, it has been understood that the value of OCR applied on the field site to reduce the secondary consolidation settlement and the final settlement is about 1.5. In addition, in order to investigate the relationship between the pre-loading period and the characteristics of long-term consolidation behavior obtained from the test results using the remolded Kwang-Yang port clayey soils, the influence on long-term consolidation behavior was not large though the pre-load was unloaded with the consolidation degree 70~80% exceeded.

본 연구에서는 재성형한 광양항 점성토를 이용하여 응력이력과 OCR이 연약 점성토의 장기압밀특성에 미치는 영향을 규명하기 위해 표준압밀시험기를 개조하여 장기압밀 시험을 수행하였다. 과압밀상태의 점토 시료에 대해, OCR이 1.5를 초과한 경우, 이차압밀 및 최종침하량은 OCR이 2.0에서 3.0으로 증가함에도 큰 차이를 보이지 않았으며, 이로부터 이차압밀과 최종침하량을 저감하기 위해 현장적용 OCR은 1.5로 나타났다. 더욱이 선행하중 재하기간과 장기압밀 거동 특성사이의 관계를 알아보기 위해 광양항 재성형 점토를 이용한 실험결과로부터 압밀도 70~80%를 초과하여 재하하중을 제거하여도 장기압밀에 미치는 영향은 크지 않은 것으로 나타났다.

Keywords

References

  1. Kim, J. Y. (2011), "Charanteristics of 1D-Consoliation for Soft Clay Ground based on a Elasto-Vsicsous Model", Master Thesis, Chonnam National University.
  2. 中野 坦. (1969), "サーチャージ工法に関する一考察", 土質工学会誌, Vol.14, No.5, pp.39-43.
  3. Adachi, T. and Oka, F. (1982), "Constitutive equations for normally consolidated clay based on elsto-viscoplasticity", Soils and Foundations, Vol.22, No.4, pp.57-70.
  4. Baek, W. J. and Moriwaki, T. (2004), "Internal behavior of clayey ground improved by vertical drains in 3D consolidation process", Soils and Foundations, Vol.44, No.3, pp.25-37.
  5. Bjerrum, L. (1967), "Engineering geology of Norwegian normally consolidated marine clays as related to settlements of buildings", Geotechnique, Vol.17, pp.81-118.
  6. Fukuzawa, E. and Kurihara, H. (1991), "Field measurements of long-term settlement", Tchi-to-Kiso, JSSMFE, Series 403, Vol.39, No.8, pp.103-117.
  7. Kamao, S., Yamada, K., and Aita, K. (1995), "Characteristics of long- term resettlement of soft ground after removal of the pre-load", Proceedings of International Symposum on Compression and Consolidation of Clayey Soil (IS-Hiroshima'95), Hiroshima, Balkema, pp.75-78.
  8. Imai, G., Tanaka, Y. and Saegusa, H. (2003), "One-dimensional consolidation modeling based on the isotache law for normally consolidated clays", Soils and Foundations, Vol.43, No.4, pp.173-188.
  9. Kutter, B. L. and Sathialingam, N. (1992), "Elastic-visco plastic modeling of the rate-dependent behaviour of clays", Geotechnique, Vol.42, No.3, pp.427-441. https://doi.org/10.1680/geot.1992.42.3.427
  10. Olson, R. E. and Ladd, C. C. (1979), "One dimensional consolidation problems", Proc. ASCE, Vol.105, No.GT1, pp.11-33.
  11. Taylor, D. W. (1948), "Fundamentals of soil mechanics." John Wiley & Sons, pp.208-249.
  12. Terzaghi, K. and Peck, R. B. (1948), "Soil mechanics in engineering practice", John Wiley and sons.
  13. Yoshikuni, H. and Kusakabe, O., Hirao, T. & Ikegami, S. (1994), "Elasto-viscous modeling of time dependent behaviour of clay", Proc. of the 13th ICSMFE, New Delhi, Vol.1, pp.417-420.
  14. Yoshikuni, H. and Okada, M., Ikegami, S. & Hirao, T. (1995), "One-dimensional consolidation analysis based on an elasto-viscous liquid model", Proc. of the International Symposium on Compression and Consolidation of Clayey Soils, IS-Hiroshima'95, Vol.1, pp.233-238.