ABSTRACT
The uncertainties involved in slope stability analysis are numerous. This is especially true in the vicinity of an ore body where mechanical properties and lithology change drastically within short distances, and information on important geologic structures and underground workings is incomplete. The computer modeling utilized both two-dimensional limit equilibrium, Carpenter, and explicit finite difference codes Itasca. Selected pit cross-sections for both as-built and end-of-pit configurations were selected based on the “worst-case” distribution of underground workings and fault zone orientations. Modeling of sequential pit slope excavation was conducted in presently unmined areas most affected by the presence of open and the backfilled drifts and the stopes. The finite difference stress-strain simulation method in particular can be used for tracing the whole process of the slope excavation, stress relief, slope deformation and failure, especially for the mined slopes with the complex geologic conditions.
