DOI QR코드

DOI QR Code

The Physical and Consolidation Characteristics of Soft Clay in Nakdong River Lower Basin

낙동강 하구지역 연약 점성토의 물리특성 및 압밀특성

  • Kang, Sung Uk (Dongsung Geotech Engineering Co.) ;
  • Jang, Jeong Wook (School of Civil, Environmental and Chemical Engineering, Changwon National University) ;
  • Chung, Youn In (School of Architecture and Civil Engineering, Keimyung University)
  • 강성욱 (동성지오텍) ;
  • 장정욱 (창원대학교 토목환경화공융합공학부) ;
  • 정연인 (계명대학교 건축토목공학부)
  • Received : 2016.10.18
  • Accepted : 2016.10.28
  • Published : 2016.10.31

Abstract

From having an experimental study of physical and consolidation characteristics of soft clay in Nakdong river lower basin, we come to the conclusion as follow. Clay minerals in Nakdong river lower basin are classified into Kaolinite and Illite. Water content($W_n$) is similarly distributed in a range of 50.4% to 92.8% in Noksan and 46.6% to 99.0% in Jangyu, and liquid limit(LL) of both areas appears lower than water content. In the case of compression index, the index of jangyu is a little higher than that of Noksan because Jangyu is in a range of 0.67 to 1.94 and Noksan in a range of 0.44 to 1.5. The second compression index of Jangyu in a range of 0.027 to 0.092 is also higher than Noksan in a range of 0.024 to 0.075. As a result of regression analysis, a relation between water content and compression index is linear, and between initial void ratio and compression index is shown to $C_c=0.80e_o-0.58$. The ratio of $C_{\alpha}/C_c$ in a range of 0.03 to 0.08 expresses a wide range.

낙동강 하구지역에 위치하고 있는 녹산지역과 장유지역에서 채취한 불교란 연약 점성토에 대한 물리적 특성시험과 압밀시험을 수행한 결과 다음과 같은 결론을 얻었다. 낙동강 하구지역 점성토의 주요 점토광물은 Kaolinite, Illite 계열로 분류되었다. 자연함수비는 녹산지역 및 장유지역이 각각 50.4~92.8%, 46.6~99.0%의 범위로 비슷하게 분포하고 있으며, 두 지역 모두 액성한계는 자연함수비($W_n$)보다 낮게 나타났다. 압축지수는 녹산지역이 0.44~1.57의 범위로 분포하고, 장유지역은 0.67~1.94의 범위로 분포하고 있어 녹산지역보다 장유지역이 다소 높게 나타났다. 이차압축지수 역시 장유지역이 0.027~0.092로 녹산지역 0.024~0.075보다 높은 것으로 나타났다. 회귀분석결과 함수비($W_n$)와 압축지수와의 관계는 선형적이며, 초기간극비와 압축지수와의 관계는 $C_c=0.80e_o-0.58$로 나타났다. $C_{\alpha}/C_c$비는 0.03~0.08로 다소 넓은 범위의 값을 나타내었다.

Keywords

References

  1. Chung, S. G., Giao, P.H., Kim, G. J. and Leroueil, S.(2002). Geotechnical properties of Pusan clay. Canadian Geotechnical Journal, Vol. 39, No. 5, 1050-1060. https://doi.org/10.1139/t02-055
  2. Gang, S. U.(2014). A Study on consolidation characteristics of clay in Noksan and Jangyu area. Master's Thesis, Changwon University (in korean).
  3. Gang, S. U., Jang, J. W. and Chung, J. G. (2014). A study on consolidation characteristics of caly in Noksan and Jangyu area. Joint Conference on Ocean Sciences, Busan, Korea, May 22-23, 1486 (in korean).
  4. Jang, J.W., Choi, S. M. and Park, C. S.(2001). A Study on the Relationship between the Physical Properties of Soil and the Compression Index of Soft Clay in Gyungnam Coastal Region. Journal of Korean Society of Coastal and Ocean Engineers, 13(4), 282-289 (in korean).
  5. Kim, Y.T. (2003). A study on geotechnical characteristics of Busan clay. Samsung Construction Co. Ltd., Busan, Korea(in korean).
  6. Mesri, G. and Castro, A.(1987). The $C{\alpha}$/Cc concept and Ko during secondary compression. Journal of geotechnical Engineering, ASCE, Vol. 113, No. GT3, 230-247.