南芬露天采场楔形滑坡机理及滑动力监测预警分析

发布时间：2018-05-12 18:12

本文选题：楔形滑坡 + NPR恒阻大变形锚索　；参考：《煤炭学报》2017年12期

【摘要】：近些年,南芬露天铁矿开采深度越来越大,局部已经形成552 m高边坡(标高142~694 m)。由于主采场断面呈"V"字型展布,采场底部空间日益狭小,滚石和滑坡灾害有效避险空间丧失,严重威胁人员和机械的安全。针对上述问题,矿山启动了三期扩帮四期开采工程,受老滑坡体影响,下盘扩帮过程中连续3年发生了多次局部滑坡灾害。针对"2016-1101滑坡"深部滑动力监测预警曲线进行分析,结合现场调查,判断其滑坡成因和破坏模式;采用赤平极射投影法分析了滑坡发生机理和滑坡体安全系数;利用FLAC3D中的Fish语言构建了具有负泊松比特性的恒阻大变形锚索(NPR)数值分析模型,并对"2016-1101滑坡"进行数值建模分析,将实际监测结果和模拟结果进行对比,发现二者具有显著的一致性,为其他类似边坡的滑坡机理分析和数值模拟计算提供了理论和实践依据。
[Abstract]:In recent years, the mining depth of Nanfen opencast iron mine is more and more deep. As the section of the main stope is "V" shaped, the space at the bottom of the stope is becoming narrower and narrower, and the effective risk avoidance space for rolling stones and landslide disasters is lost, which seriously threatens the safety of personnel and machinery. In view of the above problems, the mine started three stages of expansion and four stages of mining engineering. Affected by the old landslide, several local landslide disasters occurred in the process of down-wall expansion for three consecutive years. Based on the analysis of "2016-1101 landslide" deep landslide dynamic monitoring and warning curve, combined with on-the-spot investigation, the causes and failure mode of landslide are judged, and the landslide occurrence mechanism and landslide safety coefficient are analyzed by using Chi-plane projection method. The numerical analysis model of large deformation anchor cable with constant resistance and large deformation with negative Poisson's ratio is constructed by using Fish language in FLAC3D. The numerical model of "2016-1101 landslide" is modeled and analyzed, and the actual monitoring results are compared with the simulation results. It is found that there is significant consistency between them, which provides theoretical and practical basis for landslide mechanism analysis and numerical simulation of other similar slopes.
【作者单位】：中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室;绍兴文理学院岩石力学与地质灾害实验中心;中国矿业大学(北京)力学与建筑工程学院;本溪钢铁集团南芬露天铁矿;
【基金】：国家自然科学基金资助项目(41502323,41602308) 浙江省山体地质灾害防治协同创新中心开放基金资助项目(PCMGH-2016-Z-02)
【分类号】：P642.22;TD854.6;TD861.1

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