한국지반신소재학회논문집 (Journal of the Korean Geosynthetics Society)

  • 제15권2호
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  • Pages.25-33
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  • 2016
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  • 2508-2876(pISSN)
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  • 2287-9528(eISSN)
한국지반신소재학회 (Korean Geosynthetics Society)
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낙동강 델타지역 퇴적사질토의 특성

Characteristics of Sedimented Sandy in Nackdong River Delta

  • Kim, Byeong-Jun (Dept. of Civil and Environmental Eng, Korea Maritime and Ocean Univ.) ;
  • Kim, Jae-Hong (Infrastructure Technology Center, KWIE, K-water) ;
  • Jung, Jin-Yeong (Dept. of Civil and Environmental Eng, Korea Maritime and Ocean Univ.) ;
  • Kwon, Jeong-Keun (Dept. of Geotechnical Eng, GD consultant) ;
  • Kim, Tae-Hyung (Dept. of Civil Eng, Korea Maritime and Ocean Univ.)
  • 투고 : 2016.04.05
  • 심사 : 2016.05.25
  • 발행 : 2016.06.30
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초록

본 연구는 낙동강 하구 델타 지역의 상부퇴적사질토에 대한 기초적인 연구로 퇴적사질토의 물리적 특성과 세립분 함유율 및 상대밀도에 따른 전단강도와 투수특성에 대해 알아보았다. 전답토층 및 하부연약점토층과 인접한 구간에서 퇴적사질토는 세립분 함유량이 높고, 그 외 구간(일부제외)에서는 5%내외의 세립분을 함유한 것으로 나타났다. 비중은 심도나 위치에 상관없이 거의 일정하고, 퇴적환경에 상관없이 0.1~0.4mm의 가는 모래가 주로 분포하고, 전 구간에서 일라이트 점토광물이 검출되었다. 재성형한 상부퇴적사질토 시료의 직접전단시험 결과 상대밀도가 증가할수록 내부마찰각 및 점착력은 증가하였다. 하지만 상대밀도의 증가에 따른 내부마찰각과 점착력의 증가는 그렇게 크지 않은 것으로 나타났다. 반면 세립분 함유율의 영향이 크게 나타났는데 모래에 세립분이 증가할수록 내부마찰각은 감소하고, 점착력은 선형적으로 증가하는 경향이 나타났다. 상부퇴적사질토의 투수계수는 상대밀도 및 세립분 함유율이 증가할수록 낮아지는데 15% 이상의 세립분이 함유된 모래의 경우 투수계수는 상대밀도의 영향을 받지 않는 것으로 나타났다.

This study was a basic research to obtain the knowledge of physical properties of the upper sedimented sandy soil in the Nakdong river delta area. The characteristics of shear strength and permeability with fine content and relative density were also investigated. The upper sedimented sandy soil near paddy and lower soft clay layers showed high percentage of fine content, and the rest parts had about 5% of fine content. The specific gravity regardless of depth and location was almost constant. The upper sedimented sandy soil mostly had particle size about 0.1 ~ 0.4mm regardless of sedimentation environment and has illite, a clay mineral, in the entire soil samples. The results of direct shear tests on remolded specimens of the upper sedimented sandy soil revealed that the friction angle and cohesion increased with relative density, but its effect was not significant. The fine content was significant, that as increasing it, the friction angle decreased and cohesion increased linearly. The permeability decreased with relative density and fine content, and the permeability of soil containing more than 15% of fine content was independent on the relative density.

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참고문헌

  1. Bak. K.J. (1998), Effect of Depositional Environments on Engineering Characteristics of Marine Deposits in the Nakdong River Mouth and its Neighboring Coast, Ph.D. Thesis, Dongguk Univ.
  2. Busan Metropolitan Corporation. (2016), http://www.bmc.busan.kr/projects/industry_01_24/.
  3. Choi, H.S., Yang, J.H., Kim, T.H., Yoon, J.N., Choi, E.S. (2009), "Feasibility study on application of PBD for expanding highway road on soft ground above confined aquifer, Proc. of the Annual Conference of Korean Society of Civil Engineers, pp.1916-1919.
  4. Chung, S.G., Lee, N.K., Lee, J.M., Min, S.C., Hong, Y.P. (2010a), "Hydraulic Characteristics of Busan Clay in the Floodplain of the Nakdong River Delta", Journal of the Korean Geotechnical Society, Vol.26, No.11, pp.47-61.
  5. Chung, S.G., Ryu, C.K., Jo, K.Y., Huh, D.Y. (2005), "Geological and geotechnical characteristics of marine clays at the Busan newport", Marine Georesources and Geotechnology, Vol.23, No.3, pp.235-251. https://doi.org/10.1080/10641190500225712
  6. Chung, S.G. (2005), "Keynote Lecture: Sampling techniques and their effects in characterizing of Busan clay. Proceedings, Current Geotechnical Issues of Thick Clay Deposits", Joint Symposium of ISSMGE ATC7 and KGS TC, Sept 21-22, Busan, pp.3-36.
  7. Chung, S.G., Lee, N.K., Kim, S.R. (2009), "Hyperbolic method for prediction of prefabricated vertical drains performance", J. of Geotechnical and Geoenvironmental Engineering, ASCE, Vol.135, No.10, pp.1519-1528. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000042
  8. Chung, S.G., Lee, N.K. (2010b), "Smear effect and well resistance of PVD-installed ground based on hyperbolic method", J. of Geotechnical and Geoenvironmental Engineering, ASCE, Vol.136, No.4, pp.640-642. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000256
  9. Chung, S.G., Chung, J.G., Jang, W.Y., Lee, J.M. (2010c), "Correlations between CPT and FVT results for Busan Clay", Marine Georesources & Geotechnology, Vol.28, No.1, pp.49-63. https://doi.org/10.1080/10641190903358649
  10. Chung, S.G., Jang, W.Y., Ryu, C.K. (2006) "Compressibility Characteristics Associated with Depositional Environment of Pusan Clay in the Nakdong River Estuary", Journal of the Korean Geotechnical Society, Vol.22, No.12, pp.57-65.
  11. Korea Water Resources Corporation(K-water). (2014), "Soil Investigation Report of Busan Eco-Delta City Section 3", pp.38.
  12. Korea Water Resources Corporation(K-water). (2016), http://k-water.or.kr
  13. Jang, Y.S., Kim, Y.W. (2000), "A Study of Installation Depth of Vertical Drain for Weak Clay Soils with Artesian Pressure using 3-D Numerical Flow Model", J. of Korean Society of Civil Engineers, Vol.20, No.1-C, pp.39-46.
  14. Kim, M., Do, H.Y., Kim, G.J., Chung, S.G. (2000), "Settlement characteristics of sand deposit in the mouth of Nakdong River," J. of Korean Society of Civil Engineers, Vol.2, pp.501-504.
  15. Kim, Y.T. (2011), "Effect of Salinity on Mechanical Characteristics of Stabilized Dredged Soil", Journal of the Korean Geotechnical Society, Vol.27, No.9, pp.47-53. https://doi.org/10.7843/kgs.2011.27.9.047
  16. Kim, S.K., Kim, H.I., Hong, B.M., Kim, T.H. (1999), "Consolidation Analysis of Vertical Drain Considering Artesian Pressure", Proc. of the Annual Conference of Korean Geotechnical Society, No.5, pp.62-69.
  17. Kwon, J.G. (2012), Study on the Development of Quality Assurance Method of the Sand Compaction Pile, Ph.D. Thesis, Busan National Univ.
  18. Lee, H.K. (2012), Comparison and Analysis in Bearing Power of Nakdong River Bridge's Large Diameter Drilled Shaft Constructed, Master Thesis, Busan National Univ.
  19. Moon, S.W., Yun, H.S., Choo, C.O., Kim, W.S., Seo, Y.S. (2015), "A Study on Mineralogical and Basic Mechanical Properties of Fault Gouges in 16 Faults, Korea", J. Miner. Soc. Korea, Vol.28, No.2, 109-126. https://doi.org/10.9727/jmsk.2015.28.2.109
  20. Olson, R.E. (1974), "Shearing Strength of Kaolinite, Illite and Montmorillonite", Journal of the Geotechnical Division, ASCE, Vol.100, GT11, pp.1215-1299.
  21. Tembe, S., Lockner, D.A., Wong, T.F. (2010), "Effect of Clay Content and Mineralogy on Frictional Sliding Behavior of Simulated Gouges: Binary and Ternary Mixtures of Quartz, Illite, and Montmorillonite", Journal of Geophysical Research, 115, B03416, doi:10.1029/2009JB006383.
  22. Vinod, S.K. (2012), Evaluation of Deformation Modulus and Shear Strength of Deep Sand in the Nakdong River Delta, Ph.D. Thesis, Donga Univ.