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2013 Vol.29, Issue 11 Preview Page
Secondary Compression Characteristics Caused by Particles Crushing of Sabkha Soil

입자파쇄 특성에 따른 Sabkha층의 이차압축 특성

Seok-Ju Kim1
,
Kyung-Tae Bae2*
,
Chang-Tok Yi3
,
Heui-Soo Han4
김 석주1
,
배 경태2*
,
이 장덕3
,
한 희수4
1Graduate Student, Dept, of Civil Engrg., Kumoh National Institute of Technology
2Senior Researcher, Institute of Construction Technology, DAEWOO Engrg. & Construction Co. Ltd.
3Lecture, Dept. of Civil, Safety, and Environmental Engrg., Hankyong National Univ.
4Professor, Dept, of Civil Engrg., Kumoh National Institute of Technology
1국립금오공과대학교 토목공학과 박사과정
2대우건설기술연구원 선임연구원
3국립한경대학교 토목안전환경공학과 겸임교수
4국립금오공과대학교 토목공학과 교수
*교신저자. *Corresponding Author. 
30 November 2013. pp. 61-72
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Abstract

The consolidation tests are conducted to investigate the soil particle crushing stress for understanding the secondary compression characteristics of carbonate sandy sabkha soil caused by particle crushing under a high confining stress. The rate of secondary crushing compression () is introduced instead of the rate of secondary compression to define the characteristic of the particle crushing compression settlement (). Void ratio () and settlement () in particle crushing are used as a reference point of secondary behavior, and the ratio of primary compression index () to secondary crushing compression (), value was changed from 0.0105 to 0.0187. When comparing with quartz sands, secondary compression settlement of sabkha is very large due to particle crushing which is not usually observed in quartz sand. It is observed that as the depth of sabkha layer becomes deep, the and increase under the same stress level.

Keywords
Sabkha soil, Particle crushing
Carbonate sand
Consolidation tes
Rate of secondary crushing compression

Sabkha층 탄산질 모래의 입자파쇄발생시 이차압축특성을 파악하기 위하여 압밀시험을 수행하여 입자파쇄응력을 파악하였다. 입자파쇄 항복응력에서 순간적으로 발생한 입자파쇄 압축침하를 해석하기 위하여 이차압축률 대신 이차파쇄압축률 를 도입하였다. 입자파쇄 발생시의 간극비 와 침하량 가 이차압축거동의 기준점으로 사용되었다. 일차압축지수와 이차파쇄압축률을 비교한 결과 현장 Sabkha층의 경우 값이 0.0105∼0.0187로 나타났으며 일반적인 석영질 사질토에 비해 입자파쇄 발생으로 인한 이차압축거동이 매우 크게 나타났다. 동일한 재하응력에서는 Sabkha층의 심도가 깊을수록 입자파쇄침하량과 이차파쇄압축률이 증가함을 확인할 수 있었다.

References
1
1.Casagrande, A. (1936), The Determination of the Preconsolidation Load and Its Practical Significance, Proceedings of 1st International Conference on Soil Mechanics and Foundation Engineering, Cambridge, Mass. Vol.3, pp.60-64.
2
2.Juillie, Y. and Sherwood, D. E. (1983), Improvement of Sabkha Soil of the Arabian Gulf Coast, Proceedings of the 8th European Conference on Soil Mechanics and Foundation Engineering, Helsinki, Vol.2, pp.781-788.
3
3.Kwag, J. M. (1999), A Basic Study on Crushability of Sands and Characteristics of Particle Strength, Journal of the Korean Geo-technical Society, Vol.15, No.15, pp.193-204.
4
4.Lee, K. L. and Seed, H. B. (1967), Drained Strength Characteristics of Sands, Journal of the Soil Mechanics and Foundations Division, Vol.93, No.6, pp.117-141.
5
5.Mesri, G. (1973), Coefficient of Secondary Compression, Journal of the Soil Mechanics and Foundations Division, ASCE, Vol.99, No.SM1, pp.123-137.
6
6.Mesri, G. and Godlewski, P. M. (1977), Time and Stress-Compressibility Interrelationship, Journal of the Geotechnical Engineering Division, ASCE, Vol.103, No.5, pp.417-430.
7
7.Terzaghi, K., Peck, R. B., and Mesri, G. (1996), Soil Mechanics in Engineering Practice 3rd Edition, John Wiley and Sons. New York, pp.100-122.
Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 29
  • No :11
  • Pages :61-72
  • Received Date : 2013-06-17
  • Revised Date : 2013-08-25
  • Accepted Date : 2013-11-05
  • DOI :https://doi.org/10.7843/kgs.2013.29.11.61
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