Susceptibility of Clay Core to Cracks in Rockfill Dams by Finite Element Modeling

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The behaviour of the core of rockfill dam with slanting clay core was investigated with the Jebba main dam, Nigeria as a case study. The stress-deformation behavior of the dam was studied using the finite element mathematical modeling technique. The actual fill properties were utilized and two loading scenarios-no water and full reservoir operations-were investigated. At full reservoir, the actual seepage line, as recorded over the years was used. The linear total stress analysis using the finite element method of analysis was employed to analyze the dam section. Following the finite element mathematical modeling and computer simulations of the models, deformations and stresses distributions were determined. The results showed that the observed longitudinal cracks at the Jebba main dam crest are as a result of potential cracks in the dam core section. The cracks observed at the crest, from analysis, commenced from the dam’s core upstream face, downstream face and core crest. This may have resulted from probable hydraulic fracturing and tensile stresses developments in these regions. The results also showed likely loss of integrity of core due to cracks. However, total collapse may not be experienced but dam performance may be impaired and alarming visible cracks may not be ruled out over time.

Info:

Periodical:

Advanced Materials Research (Volumes 18-19)

Edited by:

Prof. A.O. Akii Ibhadode

Pages:

35-41

Citation:

S.O. Osuji and B.U. Anyata, "Susceptibility of Clay Core to Cracks in Rockfill Dams by Finite Element Modeling ", Advanced Materials Research, Vols. 18-19, pp. 35-41, 2007

Online since:

June 2007

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$38.00

[1] A.R. Golze (Ed) Handbook of Dam Engineering, Van Nostrand Reinhold Company, U.S. A, (1977).

[2] B. Singh and H.D. Sharma, Earth and Rockfill Dams, SMT Saltry Rastogi, Delhi, 1982.

[3] R.A. Barron, The Design of Earth Dams, Handbook of Dam Engineering, Golze A. R (ed), Van Nostrand Reinhold Company, U.S.A., 1977, PP. 291-318.

[4] NEPA Jebba Hydroelectric Development: Design Transmittal: Engineer's Analysis of Stability of the Embankment Dams, Montreal Engineering Company Limited, March (1982).

[5] J. L. Sherand, Embankment Dam Cracking, Embankment Dam Engineering Casagrande Volume, Hirschelf, R.C. & Poulos, S.J. (eds). John Wiley & Sons, New York, 1973, pp.271-353.

[6] P. Novak, A.I. B Moffat, C. Nallori, and R. Narayanam, Hydraulic Structures, Unwin Hyman Ltd., London, (1990).

[7] B. Kjaernsli, T. Valstad and K. Hoeg, HydroPower Development, Vol. 10, Rockfill Dam, Design and Construction, Norwegian Institute of Technology, Norway, (1992).

[8] C.S. Desai and J.F. Abel, Introduction to the Finite Element Method, A Numerical Method for Engineering Analysis, Van Nostrand Reinhold Company, New York, (1972).

[9] O.C. Zienkiewicz, The Finite Element Method, 2 nd Ed., McGraw-Hill Book Company Ltd England, (1977).

[10] J. L. Sherand, Embankment Dam Cracking, Embankment Dam Engineering Casagrande Volume, Hirschelf, R.C. & Poulos, S.J. (eds). John Wiley & Sons, New York, 1973, pp.271-353.

[11] J. Norzaei and E. Mohammandian, Dynamic Response of the Kavar CFRD in Southern Iran, The International Journal on Hydropower & Dams, vol. Six, Issue six, 1999, pp.70-72.

[12] V.Z. Solymer, B.C. Iloabachie, C.G. Ramesh and R.W. Leslie, Earth Foundation Treatment of Jebba Dam Site, Journal of Geotechnical Engneering, American Society of Civil Engineering (Geotechnical Engineering Division), vol. 110, October, 1984, pp.1415-1430.

DOI: https://doi.org/10.1061/(asce)0733-9410(1984)110:10(1415)

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