Abstract:

The displacement, stress and plastic zone of a high slope after excavation step by step were  analyzed using numerical analysis, and the important parts which should be reinforced was pointed out. The safety factor of the slope was obtained  through the finite difference strength reduction method, and on the basis of the FAI (failure approach index) concept, the criticality of the non-failure zone and degree of damage for the failure zone were  evaluated. The results proved that the two methods which are used to evaluate the excavation stability of slope can not only show the stability degree of slope, but can  also line out the position and extent of failure zones, damage zones and disturbed zones, provide the position of the sliding surface, and characterize the stability rules of the rock-mass. The methods  helpful to construction of the slope were presented.
 

Key words: failure approach index, finite difference strength reduction method, stability of high slope, safety control and reinforcement