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2017 Vol.16, Issue 2 Preview Page
Evaluation of Discharge Capacity of Upper Sand Deposit at the Nakdong River Estuary

낙동강 하구 상부퇴적사질토의 통수능 평가

Jin-Yeong Jeong1
,
Tae-Hyung Kim2
,
Eun-Sang Im3
,
Woong-Ki Hwang4*
,
Gyu-Jong Kim5
정 진영1
,
김 태형2
,
임 은상3
,
황 웅기4*
,
김 규종5
1Non-Member, Graduate Student, Dept. of Civil and Environmental Engineering, Korea Maritime and Ocean University
2Member, Professor, Dept. of Civil Engineering, Korea Maritime and Ocean University
3Member, Principal Researcher, Infrastructure Research Center, K-water Institute
4Member, Post-doc. Researcher, Dept. of Civil Engineering, Korea Maritime and Ocean University
5Non-Member, President, Sung-eun Geotech
*교신저자. *Corresponding Author. 
30 June 2017. pp. 109-119
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Abstract

In this research, it was investigated that whether the upper sand deposited in Nakdong River Estuary Delta region has the role of horizontal drains like sand mat. The results from tests for particle size distribution and permeability of the upper sand deposit did not meet completely the criteria for the horizontal drain material. Thus, numerical analysis has been conducted additionally. Numerical analyses of consolidation of soft soils with upper layer of sand deposit are conducted in both the sand mat with a thickness of 1m and the upper sand deposit with 1, 2, 3, and 4 m of thickness and their results are compared. As the results of numerical analysis, the upper sand deposit with a thickness of 2m or more may play the role of horizontal drains similar to a sand mat. If a PVD is installed, the ability of upper sand deposit as horizontal drains is increased. Form this study, it was concluded that the upper sand deposited in Nakdong River Estuary Delta has the role of horizontal drain.

Keywords
Sand mat
Permeability
Upper Sand Deposit
Horizontal Drains

본 연구에서는 낙동강 하구 델타지역에 위치한 연구지역의 상부퇴적사질토층이 샌드매트와 같은 수평배수재로서의 통수능 기능을 수행할 수 있는지를 검토하였다. 상부퇴적사질토에 대한 입도분포분석 및 투수시험 결과 일부 기준을 만족시키지 못하는 것으로 나타나 수치해석연구가 추가로 수행되었다. 델타지역 연약지반위에 샌드매트 1m 포설할 때와 연약지반위에 퇴적사질토층이 1, 2, 3, 4m 두께로 형성된 경우에 대한 압밀해석을 실시하였다. 그 결과 두께가 2m 이상이 되면 델타지역 퇴적사질토층은 샌드매트처럼 수평배수층으로 기능을 수행할 수 있는 것으로 나타났다. PVD를 설치한 경우 퇴적사질토층의 수평배수층 역할이 더욱 증가되었다. 본 연구를 통해 낙동강 델타 지역의 상부퇴적사질토층의 수평배수재로서의 기능이 확인 되었다.

References
1
김상규, 김윤태, 김재홍 (2014), “대심도 연약지반 연직배수재 설계시 고려사항”, 한국지반공학회지, 제30권, 제5호, pp.15-24.
2
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 University.
3
Biot, M. A. (1941), “General Theory of Three-dimensional Consolidation”, Journal of Applied Physics, Vol.12, No.2, pp.155-164.
4
Busan Metropolitan Corporation. (2016), http://www.bmc. busan.kr/projects/industry_01_24/.
5
Chung, S. G. Lee, N. K. Lee, J. M. Min, S. C., and 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.2, pp.47-61.
6
Kang, C. G. (2011). Unsaturated permeability Characteristics of silty sand on the Nakdong River, Master Thesis, Kyungpook National University.
7
Kim, B. J., Kim, J. H., Jung, J. Y., Kwon, J. K., and Kim, T. H. (2016a), “Characteristics of Sedimented Sandy in Nakdong River Delta”, Journal of the Korean Geosynthetics Society, Vol.15, No.2, pp.25-33.
8
Kim, J. H. Kim, T. H. Kwon, J. K. Kim, B. J. Jeong, and J. Y. (2015), “Study on the Physical and Mechanical Properties of Sandy Soil in the Nakdong River Delta Area”, Proc. of KSCE 2015 CONVENTION 2015 CIVIL EXPO & CONFERENCE, Gunsan, pp.1-2.
9
Kim, J. H., Kwon, J. K., Jung, J. Y., Hwang, W. K., and Kim, T. H. (2016b), “An Experimental Study on the Appli-cability of Upper Sand Deposit in the Nakdong River Delta as Horizontal Drains”, Proc. of the Fall Conference of Korean Geosynthetics Society, Gyeonggi pp.89-90.
10
Kim, S. W., Lee, S. W., Lee, J. W., Jo, K. Y., Kim, Y. T., and Kim, J. S. (2006), “Depositional Environments and Sequence Stratigraphy of estuary of the Nakdong River”, Proc. of the Spring Conference of Korean Geotechnical Society, pp.882-887.
11
Kim, Y. K. (2008), Estimation of Sandmat Thickness Considering Settlement of Soft Ground, Master Thesis, Chonju University, pp.57.
12
Korea Water Resource Corporation (K-water) (2014). Soil Investigation Report of Busan Eco-Delta City Section 3. pp.38.
13
Ministry of Land, Infrastructure and Transport (2016), Korean Construction Specification – KCS 11 30 15 : 2016, Ministry of Land, Infrastructure and Transport.
14
Nam, K. H. (1995), Behavior Analysis of the Foundation Improved with Pack drain using Modified Cam-Clay Model, Master Thesis, Chonnam National University, pp.91.
Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 16
  • No :2
  • Pages :109-119
  • Received Date : 2017-05-20
  • Revised Date : 2017-05-22
  • Accepted Date : 2017-06-21
  • DOI :https://doi.org/10.12814/jkgss.2017.16.2.109
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