帮坡角变化对露天煤矿帮坡稳定状态和最终境界的影响  

The Influence of Slope Angle Changes on the Stability State and Final Boundary of Slope in Open-Pit Coal Mines

作　　者：叶鲁青 王雁杰 YE Luqing;WANG Yanjie(Guoneng Xinjiang Zhundong Energy Co.,Ltd.,Changji Hui Autonomous Prefecture,Xinjiang 831100,China;School of Resources and Civil Engineering,Northeastern University,Shenyang,Liaoning 110819,China)

机构地区：[1]国能新疆准东能源有限责任公司,新疆昌吉回族自治州831100 [2]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《矿业研究与开发》2024年第7期57-63,共7页Mining Research and Development

摘　　要：随着深部资源开采的不断推进,露天煤矿开采过程中确保帮坡安全和提高经济效益之间的矛盾日益突出。采用负锥排除法进行露天矿最终境界优化,构建基于可靠度理论的露天矿帮坡滑坡风险评估模型,探究加陡帮坡对帮坡稳定状态和最终境界的影响,进而确定最优境界以及最佳帮坡角。研究结果表明,帮坡加陡形式主要受生产经济参数以及矿体赋存条件的影响,加陡露天矿帮坡角会使境界利润持续增加,帮坡角每增加1°,经济利润平均增加6520万元,但同时帮坡失稳概率呈指数型增长,当帮坡达到失稳临界点时,每加陡1°帮坡其失稳概率增加50%。综合考虑帮坡安全效益与经济效益,确定最优帮坡角为36.9°,较原设计方案,经济效益增加了1.33亿元。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.

关 键 词：露天煤矿 境界优化 帮坡安全 可靠度理论 浮动圆锥法 

分 类 号：TD804[矿业工程—矿山开采]