摘要
为研究高陡岩质边坡在逐级开挖卸荷下的边坡稳定性,选取位移和边坡稳定性系数作为评价指标,以某建筑用花岗岩矿为工程实例,设计两种开挖方案进行分析,揭示高陡边坡形成的位移演变规律和边坡稳定性系数变化规律,并确定边坡稳定性系数,最大位移、边坡高度与开挖最终边帮角之间的定量关系。研究结果表明:花岗岩类矿靠帮开采模式一般选用境界在地表的开口端保持不变,坑线由外向内靠帮;随着卸荷降段的增加,竖直位移及水平位移均呈增大趋势;随着最终端帮角由44°增至52°,可多采花岗岩矿石量701.72×104 t,多剥离风化层及表土154.56×104 t,有效增加了花岗岩矿的开采,降低了平均剥采比,增加了矿山企业效益;同时,边坡稳定性系数由1.93降至1.60,边坡稳定性系数与端帮角度呈三次函数负相关。研究结果可为高陡岩质矿山设计及参数优化提供借鉴,为边坡监测监控提供一种思路。
In order to study the slope stability of high and steep rock slope under gradual excavation unloading,the displacement and slope stability coefficient were selected as evaluation indicators.Taking agranite mine as an engineering example,two excavation schemes were designed to reveal the displacement evolution law of the formation of high and steep slope,as well as the change law of the slope stability coefficient.The quantitative relationships among the slope stability coefficient,the maximum displacement and the slope height with the final slope angle were determined.The research results indicate that the mining mode for granite type mines is generally selected with the boundary at the open end of the surface remaining unchanged,and the pit line leaning towards the side from outside to inside.As the unloading and descending,both vertical displacement and horizontal displacement show an increasing trend.As the final slope angle increasing from 44°to 52°,an additional 701.72×104 tons of granite ores can be mined,and 154.56×104 tons of weathered layers and topsoil can be stripped,thus,the mining amount of granite ore has been increased,the average stripping ratio has been reduced,and the income of mining enterprises has been increased.Meanwhile,the slope stability coefficient decreases from 1.93to 1.60,and the slope stability coefficient is negatively correlated with the final excavation slope angle in a cubic function.The research results can provide a reference for the design and parameter optimization of high and steep rock mines,and provide a thought for slope monitoring.
作者
葛虎胜
刘峰
苏怀斌
王宇
廖九波
方庆红
GE Husheng;LIU Feng;SU Huaibin;WANG Yu;LIAO Jiubo;FANG Qinghong(Luoyang Nonferrous Mining Group Songxian Mining Co.,Ltd.,Luoyang,Henan 471404,China;Changsha Institute of mining Research Co.,Ltd.,Changsha,Hunan 410012,China;State Key Laboratory of Metal Mine Safety Technology,Changsha,Hunan 410012,China)
出处
《矿业研究与开发》
CAS
北大核心
2023年第6期83-88,共6页
Mining Research and Development
关键词
高陡边坡
卸荷降段
最终边帮角
位移演变
稳定性
High and steep slope
Unloading and descending
Final slope angle
Displacement evolution
Stability
