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2020 Vol.36, Issue 6

Research Article

Assessing the Stability of Fill Dams by Relationship between Water Level and Porewater Pressure

저수위-간극수압의 상관관계를 통한 필댐 안정성 평가

Gichun Kang1
,
Donghwan Kim2
,
Sukmin Yoon3
,
Bong Seok Jang4
,
Jiseong Kim5*
강 기천1
,
김 동환2
,
윤 석민3
,
장 봉석4
,
김 지성5*
1Member, Assistant Prof., Dept. of Civil Engrg., Gyeongsang National Univ.
2Graduate Student, Dept. of Civil Engrg., Gyeongsang National Univ.
3Research Prof., Engrg. Research Institute, Gyeongsang National Univ.
4Head Researcher, K-water Research Institute, K-water
5Member, Assistant Prof., Dept. of Cadastre & Civil Eng., Vision College of Jeonju
1정회원, 경상대학교 토목공학과 조교수
2비회원, 경상대학교 토목공학과 석사과정
3비회원, 경상대학교 공학연구원 학술연구교수
4비회원, K-water 수석연구원
5정회원, 전주비전대학교 지적토목학과 조교수
* Corresponding Author
30 June 2020. pp. 5-15
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Abstract

본 연구는 필댐에 설치된 간극수압과 댐의 저수위와의 상관관계를 통해 댐의 안정성 평가를 위한 간극수압계의 활용방안에 대해 다루고 있다. 이를 위해 필댐에 설치된 총 8개의 간극수압계에 대해서 주성분 분석을 수행한 결과, 3개의 군집으로 분류되었다. 이는 댐 제체 내에 형성되는 침윤선을 기준으로 내부, 외부, 상단으로 분류된 것으로 나타났다. 침윤선 내부에 위치한 A군집 내 간극수압계와 저수위와의 상관계수는 0.94∼1.00로 강한 양의 선형관계를 나타냈다. 즉, 향후 A군집 내에 존재하는 간극수압계에 의해 해당 댐의 유지관리가 필요한 것을 의미한다. 또한, 저수위와 간극수압계에 대한 회귀분석을 수행한 결과, A군집의 결정계수가 0.89∼0.99로 선형회귀 모형이 도출되었다. 따라서 저수위가 설명 변수로 고정될 때 간극수압의 예측이 가능하여 현재 계측된 값과의 비교를 통해 댐의 안전성 여부를 판단할 수 있는 것으로 나타났다.

This study deals with the use of porewater pressure transducers to evaluate the stability of a fill dam through the correlation between the porewater pressure and water level. As a result of performing principal component analysis on a total of eight porewater pressure transducers installed in the fill dam, they were distributed into three groups. It was found to be distributed as internal, external, and top based on seepage line in the dam body. The correlation coefficient between porewater pressures and water level in group A located inside the seepage line indicated 0.94 to 1.00 and they are showing a strong positive linear relationships. It indicates that maintenance of the dam is required by the porewater pressure transducers of the group A. In addition, a linear regression analysis was performed with the determination coefficients of the group A of 0.89 to 0.99. It was found that the pore water pressure can be predicted and the stability of the dam can be evaluated by comparing it with the currently measured values when the water level is fixed as an explanatory variable.

Keywords
Linear regression analysis
Porewater pressure
Principal component analysis
Seepage line
Water level

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Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 36
  • No :6
  • Pages :5-15
  • Received Date : 2020-03-24
  • Revised Date : 2020-06-23
  • Accepted Date : 2020-06-23
  • DOI :https://doi.org/10.7843/kgs.2020.36.6.5
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