Abstract: Based on a field research on the Open-pit Mine and a series of outcrop and lab experiments, the engineering geological conditions such as the lithotype distributing character of rock masses on the northern-side of the mine, and the developing state of faults and joints, are analyzed. Considering that the mine is a slope-type open-pit mine and in consideration of the feature of local crustal stress, a typical section is chosen; and an elastoplastic mechanical model is established; and Drucker-Prager criterion is adopted. According to elastoplastic mechanical model, the influential degree of blasting shock on stability of the high-steep rock slope in mountain area is imitated by using elastoplastic finite elements method, the displacement field and the safety factor of the slope with fault at later stage are computed. Finally, the whole stability of the slope in later period is explored and some useful countermeasures are put forward.

Key words: rock mechanics, blasting shock, fault, slope stability, elastoplasticity