North wall stability analysis of Vasilkovskoye open pit Kazakhstan

This work focused on the stability analysis of Vasilkovskoye open pit north wall slope. The current height of the north wall is about 270 m and within the north wall area there are several critical areas that have the potential for instability at the scale of two to three benches. These areas are characterized by significant jointing and form a blocky rock mass. Because the main haulage ramp goes through this location, any wall failure would jeopardize the operational safety and productivity of the pit. Stability analysis of the wall was conducted to assess the wall stability and determine the wall failure mode as well as shape and depth of probable failure plane. Knowledge of failure plane geometry and depth is a key parameter in selecting the stabilization method. A complete rock mass characterization of north wall aiming at determining design parameters was carried out and a comprehensive numerical analysis of the wall critical areas was conducted. Moreover, with regard to the calculated shape and depth of probable failure plane at wall critical areas, recommendations for appropriate support system were suggested. Thus, slope stability analysis of this area will significantly contribute to maintaining safety and productivity of the mine. The results of the study will provide the Vasilkovskoye with valuable information on stability for safe and sustainable operations on the north wall of the mine.