The selection of seepage control route for two banks of GHP and its optimal design of curtain grouting

The two banks of the damsite of the GHP are situated on the soluble dolomite rock and limestone, so that the karst is developed and many large sized parallel flow direction faults occur in the area. According to the geological exploration and proof, a long impervious curtain should be arranged in two banks. On the basis of analyzing the relationship of the dam axis and the seepage control route in the karst area, this paper describes the selection of seepage control route in the right bank of the GHP. In the light of optimal design of impervious curtains in two banks of GHP, this paper puts forward the optimal design principles and measures of " grouting holes are distributed by stages and the hole density is gradually increased". The practice of impoundment operation for two years showed that the impervious curtains in two banks has played effective role in seepage control.