ABSTRACT
The nature slope is stable in nature condition. The middle and upper part of the slope are thick or medium thickness and thin layer limestone. Soft intercalations are developed in the layers. The river bank is very steep and developed with soft intercalations. The height of the left abutment rock slope is 310 m and the height of the large scale bedding slope of intakes is more than 360 m. The scale and the height of those slopes are rarely finding both at home and abroad. Hongjiadu Hydropower Project is located in a deep narrow river valley in Karst region. With the requirement of structure arrangement, several high rock slopes were formed at the left and right abutment, water intake and outlet, outlet of flood discharge structures, rockfill quarries. The stability of the slope is mainly affected by the adverse combination of the geological structure planes.
