All Issue

2021 Vol.37, Issue 4

Research Article

A Study on the Property of Seepage in the Curved Levee by Numerical Analysis

제방만곡부에서의 침투특성에 관한 수치해석적 연구

Choon-Sik Park1*
,
Byeong-Ho An2
박 춘식1*
,
안 병호2
1Member, Prof., Dept. of Civil, Environment and Chemical Engrg., Changwon National Univ.
2Member, Director, Geoheartengineering
1정회원, 창원대학교 토목환경화공융합공학부 교수
2정회원, 흙사랑엔지니어링 이사
*Corresponding Author
30 April 2021. pp. 5-17
PDF XML Citation
Abstract

In this paper, three-dimensional analysis of the curved levee was performed according to curvature angle, and radius of curvature to investigate the property of seepage. The hydraulic gradients in the curved parts of levees decreased in the outer levee and increased in the inner levee, compared to the two-dimensional analysis. The smaller the curvature angle and the radius of curvature, the larger the change of the hydraulic gradient, compared to the two-dimensional analysis. The effect of curvature radius on the hydraulic gradient was greater than the curvature angle. As a result of evaluating the piping safety factor for the critical hydraulic gradient, the safety factor was increased by 2~5% in the outer levee and decreased by 4~12% in the inner levee, compared to the two-dimensional analysis. Considering this reduction, if the two-dimensional analysis is performed on the curved part of the levee, and if designed the safety factor for piping is 0.1~0.3 greater than allowable FS=2.0, the safety factor of the curved part is slightly reduced, but there is no difficulty in securing stability.

Keywords
Curved levee
Hydraulic gradient
Numerical investigation
Property of seepage

본 논문은 만곡부 제방에 대해 곡률각도, 곡률반경에 따라 3차원 해석을 실시하여 침투특성을 규명하였다. 제방 만곡부에서 동수경사는 2차원 해석 결과에 비해 외측제방에서는 감소하였고, 내측제방에서는 증가하였다. 곡률각도와 곡률반경이 작을수록 2차원 해석 대비 동수경사의 변화가 큰 경향을 나타내었으며, 곡률각도보다는 곡률반경이 동수경사에 미치는 영향이 큰 것으로 나타났다. 한계동수경사에 의한 파이핑 안전율 산정결과, 2차원 해석에 대비하여 안전율은 외측제방에서는 2~5%가 증가되었고, 내측제방에서는 4~12%가 감소되었다. 이 감소폭을 고려해 볼 때 제방 만곡부에 대해 2차원 해석을 실시하고 파이핑에 대한 허용안전율 Fs=2.0보다 0.1~0.3정도 더 크게 설계하면 만곡부의 안전율은 약간 감소되지만 안정성 확보에는 무리가 없는 것으로 판단되었다.

References
1
Byun, Y. S., Kim, J. I., Baek, S. I., and Chun, B. S. (2012), "A Analytical Study on Influence of Gradients on Section Characteristics of River Banks", J. of the Korean Geo-Environmental Society, Vol.13, pp.13-19.
2
Brooks, R. H. and Corey, A. T. (1964), "Hydraulic Properties of Porous Media", Colorado State University Hydrology Paper, Vol.3, pp.27.
3
Carsel, R. F. and Parrish, R. S. (1988), Water Resources Research, Volume 24, Issue 5, May 1988, pp.755-769. 10.1029/WR024i005p00755
4
Craig, R. F. (1997), Soil Mechanics, E & FN Spon, pp.87-88.
5
Das, B. M. (2013), Advanced Soil Mechanics, Fourth Edition, CRC Press, Tayler & Francis Group Boca Raton London New York.
6
Fredlund, D. G. and Anqing Xing (1994), "Equations for the Soilwater Characteristic Curve", Can. Geotech. J., Vol.31, pp.521-532. 10.1139/t94-061
7
Fredlund, D. G. and Rahardjo, H. (1993), Soil Mechanics for Unsaturated Soils, John Wiley and Sons, Inc. 10.1002/9780470172759
8
Freeze, R. A. and Cherry, J. A. (1979), Groundwater, Prentice Hall, Inc, pp.128-130.
9
Gardner, W. R. (1958), "Some Steady State Solutions of the Unsaturated Moisture Flow Equation with Application to Evaporation from a Water Table", Soil Science, Vol.85, pp.228-232. 10.1097/00010694-195804000-00006
10
Kalin, M. (1977), "Hydraulic Piping-Theoretical and Experimental Findings", Canadian Geotechnical Journal, Vol.l4, No.1, pp.107-124. 10.1139/t77-008
11
Kim, D. S. (2004), "Research on Computation of Levee Height according to Analyzing for Water Level Change in River Bend", Master's thesis, Department of Civil and Environmental Engineering, Incheon National University.
12
Kim, J. M. Choi B. D., and Cho, S. D. (2004), "Evaluation of Affecting Factors for Seepage Analysis on Levee", J. of Korean Society of Civil Engineers, Civil Expo 2004, pp.3381-3386.
13
Kim, S. H. (2018), "Flow Characteristics by Changing the Shape of Trapezoidal Compound Cross Section in the Meandering Channel", PhD thesis, Department of Civil and Environmental Engineering, Incheon National University.
14
Lambe, T. W. and Whitman, R. V. (1978), Soil Mechanic, SI Version, John Wiley & Sons, pp.274-275.
15
Lee, S. H. and Kang, H. T. (2009), "Analysis of Changes of Seepage Line on Straight and Curved Levee", J. of the Korean Geotechnical Society, Vol.25, No.9, pp.101-106.
16
National Disaster Management Research Institute (2004), "A Study on the Estimation of the Approximate Design in Curved Channel", Engineering research report.
17
Reddi, L. N. (2003), Seepage in Soils Principles and Applications, Jonh Wiley & Sons, Inc.
18
Schmertmann, J. H. (2000), "The No-Filter Factor of Safety against Piping through Sands", ASCE, Geotechnical Special Publication, No.111, pp.65-133. 10.1061/9780784405376.006
19
Sim, G.O (2004), "Analysis of Channel Characteristics in Curved Channel for Optimal Design", National Disaster Management Institute.
20
Song, J. W. and Yun, S. U. (1982), "A Hydrological Study on the Bank Stabilization in the Bended Alluvial Rivers", Collected papers of Kyonggi University, Vol.11, pp.605-615.
Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 37
  • No :4
  • Pages :5-17
  • Received Date : 2020-05-13
  • Revised Date : 2021-04-12
  • Accepted Date : 2021-04-12
  • DOI :https://doi.org/10.7843/kgs.2021.37.4.5
Journal Informaiton Journal of the Korean Geotechnical Society Journal of the Korean Geotechnical Society
Archives
: Vol.23~28 (2007~2012)
  • NRF
  • KOFST
  • KISTI Current Status
  • KISTI Cited-by
  • crosscheck
  • orcid
  • open access
  • ccl
Journal Informaiton Journal Informaiton - close