Abstract
Based on the theory of saturated-unsaturated unsteady seepage of porous media and finite element method, it simulates seepage field of naban earth-rock dam with core under the action of rainfall infiltration and reservoir water level drawdown, including nine calculation conditions with different rainfall intensity, rainfall duration and reservoir water level decrease. Then based on the seepage field, it gets the safety factor of upstream slope of earth-rock dam with core using the limit equilibrium method. It also analyzes the rules of seepage field and slope stability with time and the influence of velocity of reservoir water level drawdown, rainfall intensity, rainfall duration on seepage field and slope stability. It will be help with reservoir regulation and daily management.
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