摘要
针对露天矿山面临的边坡安全与经济效益平衡问题,提出了一种以赤平投影分析为基础的台阶坡面角优化方法。以某露天矿高边坡为研究对象,基于赤平投影分析研究了不同台阶坡面角与优势节理裂隙面组合下的边坡破坏模式,采用极限平衡法计算了不同破坏模式下的边坡稳定性,从而获得了台阶坡面角的最优值,并运用有限元强度折减法分析了最优台阶坡面角下边坡的整体稳定性。结果表明:边坡在不同台阶坡面角下有不同的破坏模式;台阶坡面角的最优角度为65°,在3种荷载组合下均满足安全标准的要求;通过台阶坡面角优化方法获得的采场最终帮坡角为49°,相较于现状采场的最终帮坡角提升了6°,新增矿石回采量约为28.2万m^(3),根据有限元强度折减法计算的边坡的整体稳定性系数为1.783,边坡处于稳定状态,验证了该优化方法的可靠性。
Aiming at the problem of slope safety and economic benefit balance in open-pit mines,an optimization method of bench slope angle based on stereographic projection analysis was proposed.Taking the high slope of an open-pit mine as the research object,based on the stereographic projection analysis,the slope failure modes under the combination of different bench slope angles and dominant joint fissure surfaces were studied.The slope stability under different failure modes was calculated by the limit equilibrium method,and the optimal value of the bench slope angle was obtained.The finite element strength reduction method was used to analyze the overall stability of the slope under the optimal bench slope angle.The results show that the slope has different failure modes under different bench slope angles.The optimal angle of the bench slope angle is 65°,which meets the requirements of safety standards under the three load combinations.The final slope angle of the stope obtained by the bench slope angle optimization method is 49°,which is 6°higher than the final slope angle of the current stope,and the new ore recovery is about 282000 m^(3).The overall stability coefficient of the slope calculated by the finite element strength reduction method is 1.783,and the slope is in a stable state,which verifies the reliability of the optimization method.
作者
刘杨
王海军
张长锁
李京
祝鑫
刘建博
LIU Yang;WANG Haijun;ZHANG Changsuo;LI Jing;ZHU Xin;LIU Jianbo(BGRIMM Technology Group,Beijing 100160,China;College of Resource and Environmental Engineering,Wuhan University of Science and Technology,Wuhan,Hubei 430081,China;Changsha Institute of Mining Research Co.,Ltd.,Changsha,Hunan 410012,China)
出处
《矿业研究与开发》
CAS
北大核心
2024年第8期83-90,共8页
Mining Research and Development
基金
国家自然科学基金资助项目(42307252)
矿冶科技集团工程公司技术提升项目(0101-45-00058)。
关键词
露天矿
赤平投影分析
台阶坡面角
边坡稳定性
Open-pit mine
Stereographic projection analysis
Bench slope angle
Slope stability
