Abstract
Although the traditional Sarma method considers the hydrostatic pressure effect, in the actual engineering, the hydraulic conditions are complex and most of them are nonhomogeneous hydraulic boundary conditions, this paper considers the nonhomogeneous hydraulic boundary conditions based on the traditional Sarma method, and based on the improved Sarma method model, the stability evaluation of the designed slope and the slope angle is carried out with the slope of the Aynak open-pit copper mine as the engineering background-optimization study. Firstly, the numerical simulation method carried out the stability analysis of the designed excavation slopes. Then the stability of the final boundary slopes was evaluated based on the improved Sarma method model. The optimization of the final boundary slope angle was carried out by combining the traditional classical limit equilibrium theory and the improved Sarma method model under the conclusion that the originally designed slopes were more stable. The optimal slope angle suitable for the actual working conditions was obtained.