Journal of the Korean Geosynthetics Society (한국지반신소재학회논문집)

Korean Geosynthetics Society (한국지반신소재학회)
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Reliability Analysis of Open Cell Caisson Breakwater Against Circular Slip Failure

무공케이슨 방파제의 원호활동에 대한 신뢰성 분석

  • Kim, Sunghwan (Department of University Innovation, Incheon National University) ;
  • Huh, Jungwon (Department of Ocean Civil Engineering, Chonnam National University) ;
  • Kim, Dongwook (Department of Civil and Envirionmental Engineering, Incheon National University)
  • Received : 2019.11.26
  • Accepted : 2019.12.13
  • Published : 2019.12.30
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Abstract

Reliability analyses of sixteen domestic design cases of open cell caisson breakwaters against circular sliding failure were conducted in this study. For the reliability analyses, uncertainties of parameters of soils, mound, and concrete cap were assessed. Bishop simplified method was used to obtain load and resistance of open cell caisson breakwater for randomly generated open cell caisson breakwater. Sufficient number of Monte Carlo simulations were conducted for randomly generated open cell caisson breakwaters, and statistical analysis was conducted on loads and resistances collected from the large number of Monte Carlo simulations. Probability of failure produced from Monte Carlo simulation has a nonconvergence issue for very low probability of failure; therefore, First-Order Reliability Method (FORM) was conducted using the statistical characteristics of loads and resistances of open cell caisson breakwaters. In addition, effects of safety factor, uncertainties of load and resistance, and correlation between load and resistance on reliability of open cell caisson breakwaters against circular sliding failure were examined.

본 연구에서는 국내 16개의 무공케이슨 방파제 설계자료를 이용하여 원호활동에 대한 신뢰성분석을 통하여 신뢰성 수준을 분석하였다. 신뢰성 분석을 위하여 지반의 강도 및 단위중량, 피복재와 상치구조물의 단위중량, 상치구조물 상부에 재하되는 하중의 불확실성을 결정하였다. 해석변수의 불확실성을 반영하여 임의로 재현된 무공케이슨 방파제 물성에 대하여 Bishop 간편법을 이용하여 하중 및 저항을 산정하였다. 충분히 많은 회수의 무공케이슨 방파제에 대한 해석을 Monte Carlo Simulation으로 수행하였고, 모든 해석 케이스에 도출된 하중과 저항 값을 수집하여 통계분석을 하였다. Monte Carlo Simulation으로부터 도출되는 파괴확률이 아주 낮은 경우가 파괴확률의 수렴 문제가 발생하여 하중과 저항의 통계특성을 반영하여 FORM(First-Order Reliability Method) 해석을 통해 신뢰수준을 평가하였다. 무공케이슨 방파제의 안전율, 하중 및 저항의 불확실성, 하중 및 저항의 상관성이 신뢰수준에 미치는 영향을 분석하였다.

Keywords

References

  1. AASHTO (2018), LRFD Bridge Design Specifications, American Association of State Highway and Transportation Officials, 8th Edition, Washington, D.C., USA.
  2. Allen, T. M., Nowak, A. S. and Bathurst, R. J. (2005), Calibration to Determine Load and Resistance Factors for Geotechnical and Structural Design, Circular Number E-C079, Transportation Research Board, Washington, D.C.
  3. Bae, G. J. and Park, H. J. (2002), Evaluation of Planar Failure Probability for Rock Slope Based on Random Properties of Discontinuities, Journal of Korean Geotechnical Society, Vol.18, No.2, pp.97-105.
  4. Bishop, A.W. (1955), The use of the slip circle in the stability analysis of slopes. Geotechnique, 5, pp.7-17. https://doi.org/10.1680/geot.1955.5.1.7
  5. Cho, S. E. and Park, H. C. (2008), A Study on the Probabilistic Analysis Method Considering Spatial Variability of Soil Properties, Journal of Korean Geotechnical Society, Vol.24, No.8, pp.111-123.
  6. Christiani, E. (1997), Application of Reliability in Breakwater Design, Thesis PhD Hydraulics & Coastal Engineering Laboratory, Department of Civil Engineering, Aalborg University, 1997.
  7. ECS (1994), Eurocode 7:Geotechnical Design-Part I: General Rules. European Committee for Standardization, Central Secretariat, Brussels.
  8. Ellingwood, B., Galambos, T. V., MacGregor, J. G. and Cornell, C. A. (1980), Development of a probability based load criterion for American National Standard A58 -Building Code Requirements for Minimum Design Loads in Buildings and other Structures, National Bureau of Standards, Washington, D.C..
  9. El-Ramly, H. (2002), Probabilistic analyses of landslide hazards and risks: bridging theory and practice. Ph.D. thesis, University of Alberta, Edmonton, Alta.
  10. Foye, K. (2004), Limit States Design of Foundatin, JTRP final report, FHWA/IN/JTRP-2004/21, Purdue University.
  11. Griffiths, D. V. and Fenton, G. A. (2004), Probabilistic Slope Stability Analysis by Finite Elements, Journal of Geotechnical and Geoenvironmental Engineering, Vol.130, No.5, pp. 507-518. https://doi.org/10.1061/(ASCE)1090-0241(2004)130:5(507)
  12. Hassan A. M. and Woiff, T. F. (1999), Search Algorithm for Minimum Reliability Index of Earth Slopes, Journal of Geotechnical and Geoenvironmental Engineering, Vol.125, pp. 301-308. https://doi.org/10.1061/(ASCE)1090-0241(1999)125:4(301)
  13. Jang, Y. S., Oh, S. H. and Kim, J. S. (2002), Reliability Analysis of Plane Failure in Rock Slope, Journal of Korean Geotechnical Society, Vol.18, No.4, pp.119-126.
  14. Kim, H. B and Lee, S. H. (2002), A Study to Develop a Practical Probabilistic Slope Stability Analysis Method, Journal of Korean Geotechnical Society, Vol.18, No.5, pp. 271-280.
  15. Kim, K. Y. and Cho, S. E. (2006), A Study on the Probabilistic Analysis of Slopes, Journal of Korean Geotechnical Society, Vol.22, No.11, pp.101-111.
  16. Kim. D. G. (2014), Estimation of LRFD Resistance Factor and Reliability Analysis for Shallow Foundation on the Weathered Soil Ground, Ph.D Thesis, Kangwon National University.
  17. Lazarte, C. A. (2011), NCHRP Report 701: Proposed Specifications for LRFD Soil-Nailing Design and Construction, Transportation Research Board, Washington, D.C.
  18. Li, K. S. and Lumb, P. (1987), Probabilistic Design of Slopes, Canadian Geotechnical Journal, Vol.24, pp.520-535. https://doi.org/10.1139/t87-068
  19. Low, B. K. (2003), Practical Probabilistic Slope Stability Analysis, MIT Cambridge Massachusetts, Vol.2, pp. 2777-2784.
  20. Ministry of Ministry of Oceans and Fisheries (2005), Development of Next Generation Technical Design Standards for Port and Habor Structures, pp.46-47.
  21. Mostyn, G. R. and Li, K. S. (1993), Probabilistic Slope Stability-State of Play Conf. on Probabilistic Methods in Geotechnical Engineering, Balkema, Rotterdam, The Netherlands, pp.89-110.
  22. NCHRP Report 507 (2004), Load and Resistance Factor Design for Deep Foundations, Washington, D.C.: Transportation Research Board.
  23. Park, H. J., Yoon, W. S., Park, S. W., Han, H. H., Ro, B. D., Woo, I., Shin, K. H. and Kim, J. K. (2005), Evaluation of Rock Slope Failure Probability using Point Estimate Method and Maximum Likelihood Estimation, Proceeding of Korean Society of Civil Engineers, pp.5001-5004.
  24. Santamarina, J., Altschaeffl, A. and Chameau, J. (1992), Reliability of Slopes: Incorporating Qualitative Information. Transportation Research Record 1343, pp.1-5.
  25. Overseas coastal area development institute of Japan (2018), Technical Standards and Commentary for Port and Harbor Facilities of Japan, Tokyo, Japan.
  26. Vanmarcke, E. H. (1977), Reliability of Earth Slopes, Journal of Geotechnical Engineering Division, ASCE, Vol.103, pp. 1247-1265. https://doi.org/10.1061/AJGEB6.0000518