According the stability analysis of a large scale huge thick horizontal bedded rock slope in the Three Gorges Reservoir area
it is recognized that because weak surfaces
joints and the character compages of rock slope
there exist four failure modes of the horizontal bedded rock slope: collapse falling
bedding slip
cutting slip and composite slip. The stability of the bedding slip and cutting slip are calculated by using Sarma method and optimization method. The calculated results indicate that the stability of the slope is decreased after the Three Gorges Reservoir storage and the bridge building up; and cutting slip would be occurred in the slope. Some control measures must be taken. And the reservoir water level variation is the most important factor affect the stability of slope in the Three Gorges Reservoir area.