Journal of the Korean Geosynthetics Society (한국지반신소재학회논문집)

Korean Geosynthetics Society (한국지반신소재학회)
권호 표지
DOI QR코드

DOI QR Code

A Study on the Liquefaction Behavior of Soil in Jangbogo Station

남극 장보고기지 현장시료의 액상화거동 특성 연구

  • Park, Keunbo (Arctic Research Centre, Korea Polar Research Institute) ;
  • Kim, YoungSeok (Geotechnical Engineering Research Division, Korea Institute of Construction Technology)
  • Received : 2014.05.07
  • Accepted : 2014.06.23
  • Published : 2014.06.30
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, in order to take advantage of samples collected in the Jangbogo station, and to grasp the liquefaction resistance characteristics of the dynamic load was performed cyclic triaxial test. Also, through the comparison with the existing literature. The test results, for the relationship between number of cycles for the same cyclic shear stress ratio and the cyclic shear stress ratio to produce an axial strain of 5%, in all samples, the cyclic shear stress ratio to liquefaction for the specimen, which has been liquefied, was increased, whereas number of cycles were reduced. The cyclic shear stress ratio of samples first decrease up to the fine content of about 10%. After this strength level, there is a little increase in cyclic shear stress ratio with increasing fine content. In addition, the cyclic shear stress ratio between cohesive strength, mean particle size, and friction angle decrease but some time later, there was a tendency that cyclic shear stress ratio is a little increased.

본 연구에서는 남극 장보고기지 부근에서 채취한 시료를 활용하여 동하중에 대한 액상화 저항특성을 파악하기 위하여 반복삼축시험을 실시하였다. 또한 기존문헌과의 비교를 통하여 남극에서 퇴적된 지반의 동적거동을 규명하였다. 시험결과 동일한 압밀응력비에 대한 반복회수와 축변형률 5%를 발생시키는데 필요한 반복응력비와의 관계는 모든 시료에서 초기액상화를 발생시킬 수 있는 반복응력비가 증가할수록 반복회수가 감소하였다. 세립분 함유량이 10%로 증가할수록 액상화 저항강도가 감소하다가 다시 증가하는 경향을 나타내었다. 점착력과 액상화 저항강도와의 관계는 세립분 함유량과 액상화 저항강도와의 관계와 같이 점착력이 증가할수록 액상화 저항강도도 감소하지만 어느 시점 이후에는 반복응력비가 증가하는 경향을 보였다. 또한, 마찰각과 평균입경이 증가할수록 반복응력비가 증가하는 경향을 나타내었다.

Keywords

References

  1. Das, B. M. (1993), Principles of Soil Dynamics, PWS-KENT, pp.398-411.
  2. Hwang, Dae Jin (1993), "A Study on the Liquefaction Strength of Silt Containing Sands", Journal of Korean Society of Civil engineers, Vol.13, No.2, pp.243-252 (in Korean).
  3. Ishihara, K. (1985), "Stability of Natural Deposits During Earthquakes", Proceedings of the Eleventh International Conference on Soil Mechanics and Foundation Engineering, San Francisco.
  4. Ishihara, K. (1993), "Liquefaction and flow failure during earthquake", Geotechnique, Vol.3, No.3, pp.351-415.
  5. Korea Institute of Construction Technology (2012), Development of site investigation and monitoring system for extreme cold region (in Korean).
  6. Kuwano, J., Iimura, H., Takahara, K. and Nakazawa, H. (1995), "Undrained cyclic and monotonic shear behaviour of sand-kaolin mixture", Earthquake Geotechnical Engineering, Ishihara (ed.), November, pp.165-170.
  7. Law, K. T. and Ling Y. H. (1992), "Liquefaction of granular soils with non-cohesive and cohesive fines", Earthquake Engineering, Tenth World Conference, Balkema, Rotterdam, pp.1491-1496.
  8. Lee, K. L. and Seed, H. B. (1967), "Dynamic strength of anisotropically consolidated sand", Journal of the Soil Mechanics and Foundations Division, ASCE, Vol.93, No.SM5, pp.169-190.
  9. Seed, H. B. and Lee, K. L. (1966), "Liquefaction of saturated sands during cyclic loading", Journal of the Soil Mechanics and Foundations Division, ASCE, Vol.92, No.SM6, pp.105-134.
  10. Singh, S. (1996), "Liquefaction characteristics of silts", Journal of the Geotechnical and Geological Engineering, 14, pp.1-19. https://doi.org/10.1007/BF00431231
  11. Townsend, F. C. (1978), "A review of factors affecting cyclic triaxial tests", Dynamic Geotechnical Testing, ASTM STP 654, pp.356-383.
  12. Yamamuro, J. A. and Lade, P. V. (1997), "Static liquefaction of very loose sand", Canadian Geotechnical Journal, Vol.34, pp.905-917. https://doi.org/10.1139/t97-057