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2018 Vol.17, Issue 4 Preview Page

Research Article

Evaluation of Correlation between Earthquake Induced Settlement of Fill Dams and Ground Motion Parameters

지진 시 필댐의 침하량과 지반진동 변수 간의 상관관계 분석

Jongmin Baeg1
,
Duhee Park2*
,
Jinam Yoon3
,
Byoung-Han Choi4
백 종민1
,
박 두희2*
,
윤 지남3
,
최 병한4
1Member, Graduate Student, Dept. of Civil and Env. Engineering., Hanyang University, 222 Wangsimni-ro, Seoul 04763, Republic of Korea
2Member, Professor, Dept. of Civil and Env. Engineering., Hanyang University, 222 Wangsimni-ro, Seoul 04763, Republic of Korea
3Nonmember, Ph.D. Student, Dept. of Civil and Env. Engineering., Hanyang University, 222 Wangsimni-ro, Seoul 04763, Republic of Korea
4Nonmember, Senior Researcher, Ph.D., Rural Research Institute, Korea Rural Community Co., E870, Haen-ro Sangnok-gu, Ansan-si, Gyeonggi-do 15634, Republic of Korea
* Corresponding Author
30 December 2018. pp. 65-72
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Abstract

Seismically induced settlement exceeding dam freeboard may lead to a dam failure. The prediction of settlement is important also because it is also reported to be strongly related to longitudinal crack width and depth, which are critical indices used for safe evaluation of dams. The empirical correlation derived from numerical simulations is most often used. In this study, two-dimensional dynamic nonlinear analyses are performed using representative CFRD and ECRD fill dams. A total of 20 recorded motions are used to account for the influence on ground motion intensity and magnitude. The calculated crest settlements are correlated to four ground motion parameters, which are peak ground acceleration (PGA), peak ground velocity (PGV), Aria Intensity (IA), and magnitude. It is demonstrated that using ground motion parameters in addition to PGA can significantly increase the prediction accuracy.

Keywords
Earthquake
Fill dam
Crest settlement
Ground motion parameter
Correlation

지진 시 댐에 여유고 이상의 과도한 침하가 발생하는 경우 댐의 붕괴로 이어질 수 있다. 댐의 침하는 댐의 손상 예측에 중요한 지표로 사용되는 횡균열 폭과 깊이에 높은 상관성을 가진 것으로 알려져 있으므로 댐의 손상 평가에서 정확한 침하량 예측이 중요하다. 국내에서는 국외에서 수치해석을 통하여 도출된 경험적인 식이 댐의 손상 평가에 널리 사용되고 있다. 본 연구에서는 필댐으로 분류되는 콘크리트 표면차수벽 석괴댐(CFRD)과 코어형 석괴댐(ECRD) 대표 단면에 대한 2차원 비선형 동적 해석을 수행하여 댐마루의 침하량을 계산하였다. 입력지진파의 지진강도와 지진규모 등의 영향을 복합적으로 고려하기 위하여 20개의 계측기록을 해석에 사용하였다. 수치해석으로 계산된 결과를 바탕으로 댐마루 침하량을 예측하기 위해 지진파의 최대지반가속도, 최대지반속도, Arias Intensity, 지진규모와의 상관관계를 도출하였다. 평가 결과, 최대지반가속도에 추가적인 변수를 사용할 경우, 상관성이 크게 향상되는 것으로 나타났다.

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Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 17
  • No :4
  • Pages :65-72
  • Received Date : 2018-11-05
  • Revised Date : 2018-11-14
  • Accepted Date : 2018-11-14
  • DOI :https://doi.org/10.12814/jkgss.2018.17.4.065
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