某露天矿断层发育条件及对边坡稳定影响的研究  

Effect of Development Conditions of Faults on Slope Stability in a Certain Open Pit Mine

作　　者：李兆龙 张诏飞 沙原亭 LI Zhaolong;ZHANG Zhaofei;SHA Yuanting(Yichun Luming Mining Co.,Ltd.,Yichun 152500,Heilongjian,China;China Railway Resources Group Survey and Design Co.,Ltd.,Langfang 065000,Hebei,China;Technology Innovation Center of Non-coal Geotechnical Engineering,Langfang 065000,Hebei,China)

机构地区：[1]伊春鹿鸣矿业有限公司,黑龙江伊春152500 [2]中铁资源集团勘察设计有限公司,河北廊坊065000 [3]河北省非煤矿山岩土工程技术创新中心,河北廊坊065000

出　　处：《中国钼业》2024年第3期14-19,32,共7页China Molybdenum Industry

基　　金：“十四五”国家重点研发计划(编号:2022YFC2904500)。

摘　　要：以小兴安岭地区某露天矿山为例,为研究断层的发育条件,采用物探、钻探、水文地质试验等手段,综合分析断层信息,形成压扭断层的认识。分析钻探结果以及岩石、岩体结构等,划分断层发育段落,形成断层产状、规模、岩体特征等认识。分析水文地质数据及物探结论,形成阻水断层的认识;建立断层区域三维地质模型,以FLAC^(3D)数值分析研究断层对边坡稳定的影响:至最终境界,F3断层基本被采剥,边坡主体处于稳定状态。从位移量、剪应变增量、塑性区展开及安全系数结果,西北帮上部断层后背遗留的碎裂岩体是最终境界边坡稳定的主要风险因素,经计算,相关区域的安全系数小于1.0,是边坡治理的重点方向;采用削坡减载+压脚治理方案,经初步研究和计算,削坡工程量5000000 m^(3),压脚量约500000 m^(3)。与F3断层发育条件明确之前相比,治理成本基本可控。Taking a certain open-pit mine in Xiaoxing′anling area as an example,in order to study the development conditions of faults,methods such as geophysical exploration,drilling,hydrogeological tests were used to comprehensively analyze fault information and form a understanding of pressure torsion fault layers.Drilling results and rock and rock structure were analyzed,fault development sections were divided,and understanding of fault orientation,scale,and rock characteristics were formed.Hydrogeological data and geophysical conclusions was analyzed to form understanding of water blocking faults.A three-dimensional geological model of the fault area was established and FLAC numerical analysis was applied to study the impact of faults on slope stability:until the final boundary,the F3 fault has been basically mined and the main body of the slope is in a stable state.Based on the displacement,shear strain increment,plastic zone expansion,and safety factor results,the fragmented rock mass left behind the upper fault of the northwest slope is the main risk factor for the stability of the final boundary slope.After calculation,the safety factor of the relevant area is less than 1.0,which is the key direction of slope treatment;Adopting a slope cutting and load reduction+foot pressure treatment plan were adopted,after preliminary research and calculation,the amount of slope cutting work is about 5000000 m^(3),and the amount of foot pressure is about 500000 m^(3).Compared to that before the clear development conditions of the F3 fault,the cost of treatment is basically controllable.

关 键 词：压扭断层 三维地质模型 阻水 边坡 

分 类 号：TD854.6[矿业工程—金属矿开采]