NPR锚索对白云岩矿失稳边坡控制效应研究  

Study on Control Effect of NPR Cables on Unstable Slope of Dolomite Mine

作　　者：陶志刚[1,2] 孙滢滢 席思达 张未然 朱春明 隋麒儒[1,2] TAO Zhigang;SUN Yingying;XI Sida;ZHANG Weiran;ZHU Chunming;SUI Qiru(School of Mechanics and Civil Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;State Key Laboratory for Geomechanics and Deep Underground Engineering,Beijing 100083,China;China Academy of Building Research,Beijing 100013,China;CABR Foundation Engineering Co.,Ltd.,Beijing 100013,China)

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083 [2]深部岩土力学与地下工程国家重点实验室,北京100083 [3]中国建筑科学研究院有限公司,北京100013 [4]建研地基基础工程有限责任公司,北京100013

出　　处：《金属矿山》2024年第7期220-230,共11页Metal Mine

基　　金：深部岩土力学与地下工程国家重点实验室创新基金项目(编号:SKLGDUEK202201)。

摘　　要：节理裂隙是露天矿开采中边坡失稳的主要影响因素,因此,研究节理裂隙有利于解决矿区边坡开采的安全性问题。以北京黄峪口白云岩矿失稳边坡为工程地质背景,采用现场调查(测线法和赤平极射投影法)、NPR锚索数值模拟和现场监测方法,以NPR锚索主动支护思想为核心对其进行了试验研究。研究表明:①黄峪口白云岩矿边坡岩层基本呈水平状或与边坡走向方向一致,边坡体结构破碎,节理裂隙发育,存在软弱夹层和多条滑带,边坡有严重失稳的趋势。②NPR锚索入射角为20°时达到边坡最佳支护效果,边坡位移约2.55 cm,说明NPR锚索对破碎边坡起到较大的抗滑作用。③根据现场监测得出NPR锚索的锚索轴力可达300 kN左右,支护后的边坡较稳定。研究反映出,NPR锚索对节理裂隙发育的边坡控制效果较好,可为类似露天矿边坡治理提供参考。Joints and fissures are the main influencing factors of slope instability in open pit mining,therefore,the study of joints and fissures is beneficial to solve the safety problem of mine slope mining.Taking the slope instability of Huangyukou Dolomite Mine in Beijing City as the engineering geological background,the experimental study was carried out using the methods of field investigation(line survey method and chipping polar projection method),numerical simulation of NPR cables and field monitoring,with the idea of active support by NPR cables as the core.The study shows that:①The slope rock layer of Huangyukou Dolomite Mine is basically horizontal or in the same direction as the slope orientation.The structure of the slope body is fragmented,the joints and fissures are developed,and there are weak interlayer and multiple slip zones.Therefore,there is a trend of serious slope instability.②The best support effect of the slope was achieved when the angle of incidence of the NPR cable was 20°.At this time,the slope displacement was about 2.55 cm,indicating that the NPR cable had a greater antislip effect on the broken slope.③According to the field monitoring,the anchor force of NPR cable can reach about 300 kN,and the slope is more stable after support.The study indicated that NPR anchor cable has a good control effect on slope with joint crack development,which can provide reference for slope treatment of similar open-pit mine.

关 键 词：矿山边坡 节理裂隙 地质调查 边坡稳定性 数值模拟 NPR 锚索 

分 类 号：TD325[矿业工程—矿井建设]