Journal of the Korean Geosynthetics Society (한국지반신소재학회논문집)

Korean Geosynthetics Society (한국지반신소재학회)
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A Study of Consolidation Behavior of Clay Ground with Partially Penetrated PVD under Artesian Pressure

연직배수재가 부분 관입된 점토지반의 피압에 따른 압밀 거동에 관한 연구

  • Yun, Daeho (Department of Ocean engineering, Pukyong National University) ;
  • Nguyen, Ba Phu (Department of Ocean engineering, Pukyong National University) ;
  • Kim, Jaehong (Infrastructure research center, Korea Water Resources Corporation) ;
  • Kim, Yuntae (Department of Ocean engineering, Pukyong National University)
  • Received : 2016.01.19
  • Accepted : 2016.03.23
  • Published : 2016.03.30
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Abstract

Many researchers reported that artesian pressure exists in thick soft ground of Busan Nakdong river estuary. Artesian pressure in soft ground could affect rate of consolidation, settlement and drainage capasity of prefabricated vertical drain(PVD). This paper investigated consolidation behaviors of soft ground with partially penetrated PVD subjected to artesian pressure. Laboratory tests with 1-dimensional large column equipment and their numerical analyses were carried out. Test results showed that the consolidation settlement of clay ground with artesian pressure was higher than that without artesian pressure. Due to artesian pressure, the dissipation rate of excess pore water pressure was reduced in soft ground with artesian pressure, especially at bottom part of clay ground. Numerical results were in good agreement with experimental test results.

부산 낙동강 하구 대심도 연약지반 아래에 피압대수층이 존재한다는 것이 많은 연구자들에 의해 관측되었다. 연약지반에 작용하는 피압은 압밀 속도, 압밀 침하량, 연직배수재의 성능 등에 영향을 줄 수 있다. 따라서 본 연구에서는 피압의 작용 유 무에 따른 연직배수재가 부분 관입된 점토지반의 압밀 거동을 분석하였다. 연구를 수행하기 위해 일차원 대형 컬럼 장비를 이용한 실내실험과 유한요소 해석을 실시하였다. 실험 결과 피압이 작용하는 점토지반의 압밀 침하가 피압이 작용하지 않는 점토지반보다 더 크게 나타났으며, 과잉간극수압의 소산 속도는 더디게 나타났다. 또한 동일한 지반 조건을 이용하여 유한요소해석을 수행한 결과 실내 실험과 유사한 경향을 나타내었다.

Keywords

References

  1. Baek, S.H. (2002), Characterisation and Geotechnical Properties of Pusan Clays by Insitu Tests, Dong-a University, Doctor's thesis, pp.1-249 (In Korean).
  2. Choi, Y.I. (2000), Consolidation Behavior of Clay Soils with Artesian Pressure, Dong-a University, Master's thesis, pp. 3-61 (In Korean).
  3. Chung, S.G. and P.H. Giao. (2001), Examination of Pusan clays at a reference testing site, Lowland technology international, International Association of Lowland Technology (IALT), Vol. 3, No.2, pp.1-14.
  4. Chung, S.G., Lee, N.K., Lee, J.M., Min, S.C., Hong, Y.P. (2010), Hydraulic Characteristics of Busan Clay in the Floodplain of the Nakdong River Delta, Journal of Korean Geotechnical Society, Vol.26, No.11, pp.47-61 (In Korean).
  5. Chung, S.G., P.H. Giao, T.S. Nagaraj, and J.M. Kwag (2002), Characterization of estuarine marine clays for coastal reclamation in Pusan, Korea., Marine Georesources and Geotechnology, Vol.20, No.4, pp.237-254. https://doi.org/10.1080/03608860290051930
  6. Han, Y.C., Yu, G.Y. (1999), A Study of Artesian Characteristics in Yangsan/Mulgeum Site, KGS Fall '99 National Conference, pp.123-130.
  7. Heo, D.Y. (2003), A Study on the Depositional Environment and Geotechnical Properties of Clay Deposited at the Busan New Port Site, Dong-a University, Doctor's thesis, pp.8-195.
  8. 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, Journal of Korean Society of Civil Engineers, Vol.20, No.1-C, pp.39-46 (In Korean).
  9. Kim, H.T., Cho, J.H., Yoo, J.Y., Ro, J.K., Kim, S.W. (2002), Self-weight Consolidation Settlement of Soft-grounds on the Artesian Pressure After the Penetration of Vertical Drain, KGS Fall '02 National Conference, pp.597-604 (In Korean).
  10. Kim, S.K., Kim, H.I., Hong, B.M., Kim, H.T. (1999), Consolidation Analysis of Vertical Drain Considering Artesian Pressure, KGS conference '99, pp.62-69 (In Korean).
  11. Kim, T.H., Yu, J.M., Lee, M.J., Bae, K.H., Jung, D.S. (2006), A Design Case Study Considering the Artesian Pressure in Hwa Jeon Site of Nakdong Delta Area, Korean Association of Professional Engineers Soil Mechanics & Foundation Engineering, pp.311-319 (In Korean).
  12. Kim, Y.T., Do Thank Hai. (2010), Effect of Leaching on the Compressibility of Busan Clay, Journal of Civil Engineering, Vol.14, No.4, pp.291-297.
  13. Kim, Y.T., T.H. Do. (2011), Experimental Evaluation of Leaching Effects on the Compressibility of Marine Clay and its Strain Rate Dependency, Marine Georesources and geotechnology, Vol.29, No.1, pp.16-29. https://doi.org/10.1080/1064119X.2010.514239
  14. Korea water resources corporation. (2015), Subsoil investigation report of Busan Eco-Delta City - phase 1 & area 3, pp. 1-468 (in Korean).