关键词: 露天矿, 边坡稳定性, 极限平衡, 数值模拟, 敏感性分析

Abstract:

To systematically assess the slope stability of the open-pit mining stope, the Barun open-pit mine in Inner Mongolia was taken as the example. The limit equilibrium method and two-dimensional numerical simulation method were used to conduct stability analysis on the current overall slope and the final slope at the design end, respectively, and carry out the sensitivity study of geotechnical parameters. The results show that the potential failure mode of the slope presents a composite characteristic. The stability coefficients of the current slope under both self-weight and self-weight plus blasting conditions meet the requirements of the specifications. At the end of the design, the slope is in a stable state under the conditions of water content/drainage. The two-dimensional numerical simulation results (stability coefficient 1.32) further verify the slope stability. The stability coefficient is sensitive to the change in the friction angle, while the influence of the change in cohesion is relatively weak. Both the current slope and the designed final slope demonstrate good stability under both operating conditions. According to the optimization requirements of the stripping ratio, the slope angle can be moderately increased when the top position of the slope is maintained, but the rise in water level will lead to a decrease in the stability coefficient.

Key words: open-pit mine, slope stability, limit equilibrium, numerical simulation, sensitivity analysis