Analysis of Zone Safety Degree of Slopes and Its Application Based on FLAC~(3D)

The concept of zone safety degree was described based on a FLAC3D numerical model and the definition of point safety factor in static load strength analysis.A calculation module for the zone safety degree of the slope was programmed using the programming language "FISH" available with FLAC3D.The distribution of zones safety degree was obtained.Numerical simulation was carried out for underground mining under the slopes of the Anjialing Open Colliery in Pingshuo.The results show that an "arc-bedding" slide mode of the slope,influenced by underground mining,may occur.A large range in surface tension forms nearby an underground open off cut.The minimum zone safety degree is 0.88 at the south slope.The open off cut should be far away from the slope horizontally for slope stabilization.