Seepage stabilization and slope stability of type section of Xinji reservoir homogeneous earth dam were simulated using finite element method. Tree dam drainage designs, including well drainage within the dam, prism drainage at dam-toe and drainage on embankment slope, were studied under four typical unfavorable working conditions. The results indicated that three drainage schemes can meet the demands of seepage stabilization and slope stability, and the well drainage within the dam was optimal scheme, then prism drainage at dam-toe and drainage on embankment slope. Parametric sensitivity analysis of well drainage within the dam scheme showed that, after partial failure or complete failure, the safety factor of anti-slip stability of downstream dam slope were inferior to prism drainage at dam-toe. Based on comprehensive consideration of reliability of the structure, construction and stability of seepage and dam slope, prism drainage at dam-toe were recommended for Xinji reservoir homogeneous earth dam. The results of this study can provide a well reference for drainage design of homogeneous earth dam for small and medium-sized reservoirs.
Key words
homogeneous earth dam /
drainage schemes /
seepage stabilization and slope stability /
finite element simulation
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