Research Article

Analysis of the Critical Safety Thickness for Pretreatment of Mined-Out Areas Underlying the Final Slopes of Open-Pit Mines and the Effects of Treatment

Table 4

The slope stability safety factor and probability of slope failure under different working conditions.

Working conditionsCalculation method
Safety coefficientFailure probability
Simplified Bishop methodStrength reduction method

Unfilled mined-out area
 No earthquake force0.7560.49100%
 Earthquake force0.7470.49100%
Filled mined-out area
 No earthquake force1.1691.130.2%
 Earthquake force1.1451.100.4%