The plane strain analysis method was widely adopted in evaluation of dump slope stability. It is embarrassed that

dumps sometimes destroyed but the safety factor was go over the allowable value. Regardless of those issues had been mentioned frequently

such as mechanical parameters

constitutive model and so on

the spatial clamp effect of convex and divergent effect of concave and slide-body-end effect are also play vital roles in analysis of slope stability. For those reasons

proceed from conditions of plane elevation data

geological section

drilling data and others

Kriging interpolation method

which can obtained a smooth effect of interpolation

was adopted

and then the three-dimensional(3D) geological model of dump was built. Then an interface program

wrote by FISH

was used to import the 3D-model into FLAC3D to discretization and calculation. In this way

the issues mentioned above can be figure out efficiently. Trinity function include 3D geological modeling

model visualization

geotechnical analysis was achieved in a simple and highly efficient way. An example of Jianshan seventh dump of Lanjian Iron Mine

Pangang Group co. Ltd. of China

was concerned by previous mean

3D stress-strain analysis was carried out

3D global safety factor was also calculated by 3D strength reduction method. It turned out that the results was accordant to the field investigation and plane strain analysis conclusion. Results calculated by the 3D geological model cannot be affected by dump spatial effect and slide-body-end effect

the general stress-strain pattern

which obtained from the method

can be instructive and meaningful to production management for open-mine dumps.