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Seepage Characteristics of Embedded Rock Layer Under the Earth Fill  

Lee Haeng-Woo (Rural Research Institute, KARICO)
Chang Pyoung-Wuck (School of Biological Resources & Materials Engineering, Seoul Nat'l Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.21, no.8, 2005 , pp. 63-72 More about this Journal
Abstract
Rocks are dumped to soft marine ground in order to improve trafficability and construction conditions in the tideland reclamation construction sites. Though this rock layer under earth fill has caused in a serious seepage problems after construction, seepage behaviors of this embankment structure is not correctly investigated. Water flow through rock layers is, in general, known as Non-Darcy's flow. However, the embedded rock layer under earth fill is not known whether its flow is governed by Darcy's or Non-Darcy's law. Therefore, a numerical analysis, laboratory model test and filed investigations were performed for analyzing the those seepage characteristics in this research. Results show that there is significance of $95\%$ of confidence between observed heads and seepage rates, and the calculated ones by SAMTLE which is developed under the assumption that the water flows through the two-layer system obey the Darcy's flow. And after operating the hydraulic gradient(i) of $0.10\~0.55$ upon laboratory model, these seepage characteristics of the embedded rock layer show that Reynolds Numbers are less than 10 and the relationship between these velocities of rock layer(v) and hydraulic gradients(i) is linearly proportional with more than 0.79 of the coefficient of correlation $(R^2)$. And the Reynolds Number of the velocity calculated by the relation of v=ki in the embedded rock layer of OO sea dike is $1\~6$. It shows also laminar flow. Based on these results, it is concluded that the seepage characteristics of embedded rock layer under earth fill can be laminar and Darcy's flow.
Keywords
Darcy's flow; Embedded rock layer; Non-Darcy's flow; Seepage characteristics; Two-layer seepage analysis model (SAMTLE);
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Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 농업기반공사 (1995), 한국의 간척
2 이행우, 장병욱, 장웅희, 정인영 (2004), 바닥사석층의 통수에 따른 성토제체 침윤선 변화연구, 2004 한국농공학회 학술발표논문집(CD), No.045
3 Polubarinova-Kochina, P. Y. (1962), Theory of Ground Water Movement, Translated from the Russian by J. M. Roger De Wiest, Princeton University Press, New Jersey, pp.284-297
4 Taylor, D.W. (1948), Fundamentals of soil mechanics. John Wiley and Sons Inc, New York
5 최흥식 (2004), 호안제체에서 Non-Darcy 흐름해석, 한국수자원학회 논문집, 제37권, 제2호, pp.97-96
6 한신공영 (2004), 화옹지구 방조제 침출수 원인분석 및 대책방안 연구, 농업기반공사
7 이행우 (2005), 방조제 바닥사석층의 규모 및 통수성에 따른 제체 침투특성 연구, 서울대학교 박사학위논문
8 농업기반공사 (2002), 화옹방조제 끝막이 보고서
9 Li, B., Garga, V.K., and Davies, M.H. (1998). Relationship for non-Darcy flow in rockfill, Journal of Hydraulic Engineering, ASCE, Vol.124, No.2, pp.206-212   DOI   ScienceOn
10 농림부 (2003), '03 새만금지구 수리실험보고서, 농업기반공사, pp.172-183
11 이행우, 장병욱, 장웅희, 김시운 (2005b), 성토층 하부의 자갈층 유.무에 따른 침투특성 변화, 한국농공학회논문집, 제47권, 제4호, pp.53-61   DOI
12 이행우, 장병욱 (2005a), 2층 성토제 침투해석모형(SAMTLE)의 개발 및 적용, 대한토목학회 논문집, 제25권, 제5C호, pp.353-360