The Influence of Slope Angle Changes on the Stability State and Final Boundary of Slope in Open-Pit Coal Mines
With the continuous advancement of deep resource extraction,the contradiction between ensuring slope safety and improving economic benefits in open-pit coal mining is becoming increasingly prominent.To determine the optimal boundary and the optimal slope angle,the negative cone exclusion method was used to optimize the final boundary of open-pit mines,a risk assessment model for open-pit mine slopes based on reliability theory was constructed,and the impact of steepening slopes on the stability and final boundary of slopes was explored.The research results show that the form of steepening the slope is mainly influenced by production economic parameters and the occurrence conditions of the ore body.Steeping the slope angle of an open-pit mine will continuously increase the boundary profit.For every 1° increase in slope angle,the average economic profit increases by 65.2 million yuan.However,the probability of slope instability increases exponentially at the same time.When the slope reaches the critical point of instability,the probability of slope instability increases by 50％for every 1° increase in slope angle.Taking into account both the safety and economic benefits of the slope,the optimal slope angle is 36.9°,which increases the economic benefits by 133 million yuan compared to the original design scheme.
万方数据
维普
