DOI QR코드

DOI QR Code

3차원 유한요소해석에 의한 필 댐의 3가지 단면 형상을 고려한 지진해석

Dynamic Analysis of 3 Different Cross-Sectional Shapes of a Fill Dam using 3D FEM Analysis

  • 투고 : 2015.06.05
  • 심사 : 2015.06.25
  • 발행 : 2015.08.01

초록

댐 유지관리 측면에서 계측기를 통해 실시간 댐 거동을 파악하고 있으나 노후 댐의 경우 댐 축조 시 설치한 계측기가 오작동하거나 작동되지 않는 경우도 빈번히 발생하고 있다. 1종 국가시설물인 댐은 정밀안전진단을 통해 주기적으로 댐의 상태를 파악하고 있으며, 정밀안전진단 시 댐체의 안정성 평가를 실시하고 있다. 일반적으로 댐 안정성평가 시 가장 큰 단면을 대표단면으로 적용해 2차원 수치해석으로 결론을 도출하고 있으나 최근 많은 연구자들이 3차원 수치해석 프로그램 기술 발달에 기인해 댐 형상, 주변지형 및 댐 하부지형 형상을 정확히 반영한 3차원 수치해석에 관한 연구를 수행하고 있다. 본 연구에서는 지진에 대한 댐 안정성 평가를 위해 지반공학 범용 FEM 해석 프로그램인 PLAXIS 3D를 이용하여 존별 형상을 모두 반영한 댐체의 지진 특성과 댐체를 사력존 하나로 가정한 경우, 댐체를 사력존 및 코어존으로 가정한 경우와 수치해석 결과를 비교 분석하여 존별 형상에 따른 지진파 영향 특성을 분석하고자 한다.

Dam movements are identified in real-time with measuring instruments for dam maintenance. However, for dams that have aged, the measuring instruments that were installed during the dam construction are frequently malfunctioning or completely failing altogether. Precision safety diagnosis is being executed for dams that are national facilities Type 1. During the diagnosis, a safety assessment is conducted for the dam body. Normally, during the analysis of dam safety, the widest cross-section is selected and a two-dimensional numerical analysis is taken place for the cross-section. However, numerous researchers have recently looked into applying the 3-dimensional numerical analysis program developments to precisely analyze the structure of the dam, as well as the surrounding strata, and the lower dam strata. In this study, PLAXIS 3D, a geotechnical generic FEM analysis program, was used to conduct dam safety assessments for earthquakes. The following were compared and analyzed: considering the seismic properties of the dam body with all zoned structures reflected as one rock-fill zone together with the dam body, considering the dam body as the rock-fill zone and the core zone, and the numerical analysis results. Thus, the study was aimed to analyze the impact properties of seismic waves according to the different zones.

키워드

참고문헌

  1. 국토해양부 (2011), 댐 설계기준, pp. 216-218.
  2. 한국시설안전공단 (2004), 국내 내진성능평가, pp. 26-48, pp. 162-165.
  3. Akhtarpour, A. and Khodaii, A. (2012), 2d&3d nonlinear dynamic analysis of asphaltic concrete core rockfill dam (a Case study), Proceedings of International Symposium on Dams for a changing world, paper No. 237.
  4. Chakraborty, D. and Choudhury, D. (2011), Seismic behavior of tailings dam using flac3d, Proceedings of Geo-Frontiers 2011, pp. 3138-3147.
  5. Ha, I. S., Lee, J. W. and Oh, B. H. (2009a), Comparison of characteristics of dam acceleration response by 2-d and 3-d dynamic analysis, Proceedings of Korean Geo-Environmental Conference 2009, KGES, Incheon, pp. 247-253 (in Korean).
  6. Ha, I. S., Lee, J. W. and Oh, B. H. (2009b), Characteristics of response of rockfill dam by 3-d Seismic response analysis, Proceedings of 35th Annual Conference of Korean Society of Civil Engineers, KSCE, Hoengseong, pp. 2886-2889 (in Korean).
  7. Lysmer, J. and Kuhlmeyer, R. L. (1969), Finite dynamic model for infinite media, Journal of the Engineering Mechanics Division, Vol. 95, No. 4, pp. 859-878.
  8. Park, D. S. (2014), A study on the seismic resistance of fill-dams by newmark-type deformation analysis, The Journal of the Earthquake Engineering Society of Korea, Vol. 18, No. 4, pp. 161-170 (in Korean). https://doi.org/10.5000/EESK.2014.18.4.161
  9. Park, I. J., Kim, S. W., Jang, W. H., Kim, H. T. and Yoo, C. H. (2006), Evaluation of aseismic performance for reservoir dams in Korea, Journal of the Korean Geo-Environmenal Society, Vol. 7, No. 6, pp. 89-100 (in Korean).
  10. Wieland, M. (2012), Seismic design and performance criteria for large storage dams, 15th World Conference on Earthquake Engineering Lisboa, Vol. 638, pp. 24-28.

피인용 문헌

  1. 항타기 전도예방을 위한 임시 철판의 두께에 관한 연구 vol.21, pp.11, 2015, https://doi.org/10.14481/jkges.2020.21.11.5
  2. Seismic Performance Evaluation of Agricultural Reservoir Embankment through Shaking Table Tests vol.21, pp.3, 2015, https://doi.org/10.9798/kosham.2021.21.3.151