露天矿最终帮坡角及采深协同优化研究  

Study on Synergistic Optimization of Final Slope Angle and Mining Depth in Open-pit Mine

作　　者：郭赟林 刘艳章[1,2] 黄诗冰 胡斌 李凯兵 李伟 Guo Yunlin;Liu Yanzhang;Huang Shibing;Hu Bin;Li Kaibing;Li Wei(College of Resource and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources,Wuhan 430081,China)

机构地区：[1]武汉科技大学资源与环境工程学院,湖北武汉430081 [2]冶金矿产资源高效利用与造块湖北省重点实验室,湖北武汉430081

出　　处：《金属矿山》2019年第5期37-42,共6页Metal Mine

基　　金：国家自然科学基金项目(编号:51074115;51574183;41702291)

摘　　要：最终帮坡角和采深是露天矿境界设计中2个相互影响的关键参数,其取值与露天矿的安全经济性密切相关。为探讨上述2个参数的合理取值,以西藏某露天铜矿12#典型勘探线剖面为研究对象,按经验类比法初步确定该剖面西、东边帮的最终帮坡角取值范围为38°～44°,选取不同的两帮坡角度值组合,根据境界剥采比小于经济合理剥采比的原则,计算得到底部标高取值范围为+4 135～+4 108 m。构建了该剖面的露天境界最终边帮有限元数值模型,采用强度折减法计算得到西、东帮的稳定安全系数,根据实际工程设计需要的边帮安全系数以及开采的经济性,得到该剖面合理的最终帮坡角与采深。研究表明:露天边帮稳定性随着最终帮坡角和采深的增加逐渐降低,且最终帮坡角的变化对本侧边帮稳定性的影响远大于对侧边帮,两参数之间互相影响,共同决定露天矿的安全经济性;计算得到该剖面合理的西、东帮最终帮坡角分别为42°、43°,底部标高为+4 117 m,总采深为920 m。所采用的露天矿最终帮坡角及采深的协同优化思路可为露天矿山科学确定相关参数提供参考。The final slope angle and mining depth are two key parameters that affect each other in the design of open-pit boundary,and their values are closely related to the safety and economy of open-pit mine.In order to discuss the reasonable values of the above two parameters,taking the 12# typical exploration line section of an open-pit copper mine in Tibet as the study example,based on empirical analogy method,the final slope angles of the western and eastern slopes of the section are preliminarily determined as 38°~44°,and the combination of different slope angles are selected.According to principal of the boundary stripping ratio less than economic stripping ratio,the calculated bottom elevation is from + 4 135 m to + 4 108 m. The finite element numerical model of the final slope of the open-pit boundary of the section is established.The safety factors of the western and eastern slopes are calculated by strength reduction method.According to the safety factors of the slope and the economy of mining,the reasonable final slope angle and mining depth of the section are obtained.The study results show that the stability of open-pit slope decreases gradually with the increase of final slope angle and mining depth,and the influence of final slope angle on the stability of slope is much greater than that of the opposite side slope,the two parameters influence each other and determine the safety and economic effect of open-pit mine together;the calculated reasonable final slope angles of the western and eastern slopes of the section are 42° and 43° respectively,with the bottom elevation is + 4 117 m and the total mining depth is 920 m.The above study ideal of synergistic optimization of final Slope angle and mining depth in open-pit mine can provide some reliable reference for the scientific determination of relevant parameters in open-pit mines.

关 键 词：露天开采 边帮安全系数 最终帮坡角 开采深度 经济合理剥采比 数值模拟 

分 类 号：TD854[矿业工程—金属矿开采]