With the dam section 28# of Datengxia Hydropower Station in Guangxi Province as an example, this paper uses the software UDEC to study the seepage of the dam foundation rock mass and the stability of the dam foundation rock mass under the impacts of seepage. The dam foundation rock mass consists of continuous gently-dipping weak intercalated layers and intermittent steeply-dipping tectonic fissures. In order to analyze the impacts of the anti-seepage curtain on the seepage of the dam foundation rock mass and the stability of the dam foundation, this paper takes parameters such as the displacement of the key points, the lifting pressure, and the unbalanced force and the plastic yield zone within the model as the criteria for quantitative analysis. The analysis results show that the anti-seepage curtain can effectively isolate the seepage of the dam foundation rock mass, so that the dam foundation rock mass can be maintained stable and undamaged. Finally, by comparing the numerical simulation results with the calculation results of the analytical method, this paper proves the reliability and rationality of this method and shows that it can be used as a reference for analysis in similar projects.
seepage, stability, UDEC, discrete element
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