地下转露天开采条件下某露天矿高陡边坡稳定性分析
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摘要
某露天矿为地下转露天开采,在复杂工程地质条件和原地下采空区的综合影响下,露天边坡极易发生塌陷、台阶失稳等灾害,严重威胁露天矿安全生产。为研究地下转露天开采条件下某露天矿高陡边坡的岩体变形破坏规律,结合实际地质条件,利用Dimine-Midas/GTS NX耦合建立大型露天矿三维工程地质模型,并进行稳定性计算分析。分析结果表明:地下采空区顶板变形量较小,对露天矿边坡影响不大;南部强风化岩区域边坡位移量较大,边坡有向外"滑动"的趋势;开挖至-180m平台时,边坡安全系数降至临界值,并出现塑性区开始贯通坡脚现象;综合分析得出该矿山开采的临界水平为-180m平台。通过对该实例工程边坡的破坏机制分析,揭示了边坡变形破坏的主要因素,并为后续边坡治理提供理论指导。
An open pit mine is turned from underground to open-pit mining.Under the comprehensive influence of complex engineering geological conditions and the original underground goaf,the open-pit slope is prone to collapse and step instability and other disasters,which seriously threatens the safety production of open-pit mine.In order to study the rock mass deformation and failure law of a high-steep slope in an open-pit mine under the conditions of underground open-pit mining,and a three-dimensional engineering geological model of large open-pit mine was established by using Dimine-Midas/GTS NX coupling method and its stability was calculated and analyzed.The results show that the roof deformation of underground mined-out area is small and has little effect on the slope of open pit mine;the slope displacement in south area of strong weathered rock is large,and the slope has a tendency of " sliding" outward;when excavated to-180 m platform,the slope safety factor drops to the critical value,and the plastic zone begins to penetrate the foot of slope.The comprehensive analysis shows that the critical level of mining is-180 mplatform.Through the analysis of the failure mechanism of the example engineering slope,the main factors of the slope deformation and failure are revealed,and the theoretical guidance for the subsequent slope management is provided.
An open pit mine is turned from underground to open-pit mining.Under the comprehensive influence of complex engineering geological conditions and the original underground goaf,the open-pit slope is prone to collapse and step instability and other disasters,which seriously threatens the safety production of open-pit mine.In order to study the rock mass deformation and failure law of a high-steep slope in an open-pit mine under the conditions of underground open-pit mining,and a three-dimensional engineering geological model of large open-pit mine was established by using Dimine-Midas/GTS NX coupling method and its stability was calculated and analyzed.The results show that the roof deformation of underground mined-out area is small and has little effect on the slope of open pit mine;the slope displacement in south area of strong weathered rock is large,and the slope has a tendency of " sliding" outward;when excavated to-180 m platform,the slope safety factor drops to the critical value,and the plastic zone begins to penetrate the foot of slope.The comprehensive analysis shows that the critical level of mining is-180 mplatform.Through the analysis of the failure mechanism of the example engineering slope,the main factors of the slope deformation and failure are revealed,and the theoretical guidance for the subsequent slope management is provided.
引文
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[3]王振伟.井工开采对露天矿边坡稳定性影响的试验研究[J].岩土力学,2014,35(7):1843-1848.WANG Zhenwei.Experimental study of impact of underground mining on stability of open pit slope[J].Rock and Soil Mechanics,2014,35(7):1843-1848.
[4]孙琦,魏晓刚,卫星,等.采空区矿柱流变特性对露天矿边坡稳定性的影响研究[J].中国安全科学学报,2014,24(8):85-91.SUN Qi,WEI Xiaogang,WEI Xing,et al.Study on effects of pillars rheological properties on open-pit slope stability[J].China Safety Science Journal,2014,24(8):85-91.
[5]刘东伟.露天矿边坡稳定性安全因素分析[J].世界有色金属,2017(15):201-203.LIU Dongwei.Discussion on safety factors of slope stability in open pit mine[J].World Nonferrous Metals,2017(15):201-203.
[6]张文平,胡建华,林允.多因素作用下的露天矿边坡稳定性分析[J].现代矿业,2015,31(8):145-147,151.ZHANG Wenping, HU Jianhua,LIN Yun.Stability analysis of open-pit slope under multi factors[J].Modern Mining,2015,31(8):145-147,151.
[7]孙世国,郭炜晨,刘文波,等.露天转地下开采诱发高边坡滑移机制研究[J].金属矿山,2015,44(5):162-165.SUN Shiguo,GUO Weichen,LIU Wenbo,et al.Study on high slope sliding deformation mechanism induced by transiting from opencast into underground mining[J].Metal Mine,2015,44(5):162-165.
[8]周群.基于灰色多层次的露天转地下开采边坡稳定性评价模型[J].矿冶,2018,27(3):35-40.ZHOU Qun.Stability evaluation model of slope in transition from open-pit to underground mining based on grey multi-level analysis[J].Mining&Metallurgy,2018,27(3):35-40.
[9]杜时贵.大型露天矿山边坡稳定性等精度评价方法[J].岩石力学与工程学报,2018,37(6):1301-1331.DU Shigui.Method of equal accuracy assessment for the stability analysis of large open-pit mine slopes[J].Chinese Journal of Rock Mechanics and Engineering,2018,37(6):1301-1331.
[10]任红岗,谭卓英,董叶茂.露天矿高陡边坡稳定性评价及综合加固措施[J].有色金属(矿山部分),2015,67(1):77-82.REN Honggang, TAN Zhouying, DONG Yemao.Stability evaluation and comprehensive reinforcement measures of high steep open pit slope[J].Nonferrous Metals(Mining Section),2015,67(1):77-82.
[11]孙世国,张玉娟,张英海,等.露天地下同期开采对边坡变形影响机制研究[J].金属矿山,2016,45(11):58-62.SUN Shiguo,ZHANG Yujuan,ZHANG Yinghai,et al.Research on influencing mechanism of the synchronous mining of open-pit and underground on slope deformation[J].Metal Mine,2016,45(11):58-62.
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