Two kinds of ground treatment methods

gravel piles and dynamic replacement methods

are introduced

which are the most popular treatments at high fill foundation of airport in mountainous area. Comparative studies are carried out by the strength reduction FEM to analyze slope stability of 79-79? engineering geological profile in Kunming new airport under different ground treatments. Comparison between the outcome of stability analysis calculated by FEM and that calculated by simplified Bishop method is also implemented. Moreover

without reducing soil strength parameters

comparative studies of displacements and shear strains of the slope under different ground treatments are performed. The results show that the disposal of the relative soft foundation within slope toe with gravel piles or dynamic replacement method can not only enhance slope safety factor effectively

but also reduce maximum displacements and shear strains by leaps and bounds. Furthermore

safety factors and the most dangerous sliding surfaces calculated by the strength reduction FEM are close to that calculated by simplified Bishop method

when the most dangerous sliding surfaces are close to arc shape. And safety factors

calculated by the strength reduction FEM

are conservative as they are slightly smaller than those calculated by simplified Bishop method. Finally

gravel pile method is better than dynamic replacement method when the coating over moderately weathered bedrock is deeper than the treatment depth of dynamic replacement.