DOI QR코드

DOI QR Code

Seepage Quantity Evaluation of a Fill Dam using 3D FEM Analysis

3차원 수치해석에 의한 필 댐의 누수량 평가

  • Received : 2015.06.05
  • Accepted : 2015.06.29
  • Published : 2015.08.01

Abstract

Using 2D numerical analysis that covers the largest section of the dam body, a process is generally performed when evaluating its stability against seepage. The quantity of seepage is first obtained by assuming that its bottom topography is in the simple form of a rectangle, it is then calculated by reflecting its sectional shape during this process of analyzing the seepage quantity. Considering that various forms of dams are being constructed on various types of ground, thanks to more recent technological advances, it is judged more appropriate to draw a conclusion by means of the results on reflecting the realistic shape and topographical conditions of the dam body through 3D numerical analysis. Therefore, this study intends to present a method designed to carry out safety management by evaluating the correct quantity of water leakage that passes only through the dam body, having excluded other factors that include the amount of rainfall through the 3D FEM analysis.

침투에 대한 안정성 평가 시 댐체의 가장 큰 단면을 반영해 2차원으로 수치해석을 실시하는 것이 일반적이며, 해석결과를 이용한 침투수량 평가 시 댐체 하부지반을 단순한 직사각형 형태로 가정하여 침투수량을 구한 후 단면형상을 반영해 최종 침투수량을 계산하고 있다. 하지만 최근 기술의 발달로 댐 시공 시 다양한 형태의 지반 위에 다양한 형태의 댐들이 축조되고 있는 점을 감안하면 3차원 수치해석을 통해 댐체의 형상 및 지형조건을 보다 정확하게 반영한 결과를 이용하여 결론을 도출하는 것이 바람직하다고 판단된다. 따라서 본 연구에서는 3차원 FEM 수치해석법을 이용하여 강우량을 포함한 다른 기타요인은 배제한 후 댐체로만 통과되는 침투수량 평가를 통해 안전관리를 할 수 있는 방안을 제시하고자 한다.

Keywords

References

  1. 한국시설안전공단 (1997), 임하다목적댐 정밀안전진단보고서 (2차), pp. 268-296.
  2. 한국시설안전공단 (2012), 임하다목적댐 정밀안전진단보고서 (2차), pp. 360-370.
  3. Chen, Q. and Zhang, L. M. (2006), Three-dimensional analysis of water infiltration into the gouhou rockfill dam using saturated-unsaturated seepage theory, Canadian Geotechnical Journal, Vol. 43, No. 5, pp. 449-461. https://doi.org/10.1139/t06-011
  4. Cho, J. H., Kim, K. H. and Yoon, Y. H. (1998), A study on the leakage characteristics and management of leakage water in zoned rockfill dam, research institute for industrial science and technology chungbuk national university, Journal of Industrial Science and Technology Institute, Vol. 12, No. 2, pp. 299-309 (in Korean).
  5. Chung, K. J. and Lee, S. (2010), A study on long-term seepage behaviour of fill dam by the monitoring data analysis, Journal of the Korea geotechnical Society, Vol. 11, No. 9, pp. 15-25 (in Korean).
  6. Lee, K. T. and Lim, H. D. (2007), A study on seepage and crest settlement of central cored rockfill dam-The case of im-ha dam-, Journal of Korea Society of Civil Engineers, Vol. 27, No. 6C, pp. 383-392 (in Korean).
  7. van Genuchten, M. T. (1980), A closed-form equation for predicting the hydraulic conductivity of on saturated soils, Soil Science Society of America Journal, Vol. 44, No. 5, pp. 892-898. https://doi.org/10.2136/sssaj1980.03615995004400050002x