王长军,卢磊芬,秦仕文,等. 三贵口铅锌矿矿柱回收对地表沉陷影响研究[J]. 中国矿业,2024,33(3):168-176. DOI: 10.12075/j.issn.1004-4051.20230741
    引用本文: 王长军,卢磊芬,秦仕文,等. 三贵口铅锌矿矿柱回收对地表沉陷影响研究[J]. 中国矿业,2024,33(3):168-176. DOI: 10.12075/j.issn.1004-4051.20230741
    WANG Changjun,LU Leifen,QIN Shiwen,et al. Study on the impact of pillar recovery on surface subsidence in Sanguikou Lead-Zinc Mine[J]. China Mining Magazine,2024,33(3):168-176. DOI: 10.12075/j.issn.1004-4051.20230741
    Citation: WANG Changjun,LU Leifen,QIN Shiwen,et al. Study on the impact of pillar recovery on surface subsidence in Sanguikou Lead-Zinc Mine[J]. China Mining Magazine,2024,33(3):168-176. DOI: 10.12075/j.issn.1004-4051.20230741

    三贵口铅锌矿矿柱回收对地表沉陷影响研究

    Study on the impact of pillar recovery on surface subsidence in Sanguikou Lead-Zinc Mine

    • 摘要: 针对乌拉特后旗紫金三贵口铅锌矿现场工程地质条件、矿柱形态及分布,以及现存采空区整体稳定性评价结果,采场内遗留的部分矿柱具备回收条件。为明确630 m及以上中段矿柱回收对地表变形产生的影响,对地表沉陷规律和岩层移动范围进行预测分析,并评价相关采矿活动可能产生的影响。本文研究了基于随机介质理论的概率积分法对矿柱回收地表移动及沉陷进行理论计算分析,采用三维采空区扫描建立精细化的采空区和矿柱模型,并利用FLAC3D数值模拟软件系统研究矿柱回收对地表沉陷的影响。研究结果表明,回采安全等级为I级的矿柱回收方案,理论计算和数值模拟结果中的地表最大下沉量和水平移动值基本一致,且二者所确定的地表影响范围和沉陷分布规律也基本一致,主要集中在矿柱及采空区密集区域;同时,地表最大倾斜远小于1 mm/m、最大曲率远小于0.05 mm/m2、最大水平变形远小于1 mm/m,表明矿柱回采后地表变形沉陷处于安全范围之内,不会因矿柱回收产生较大的地表变形沉陷而造成地表塌陷等灾害,研究结果为矿山后续开采提供了理论支撑。

       

      Abstract: Focusing on the engineering geological conditions, the shape and distribution of the pillars, as well as the results of the evaluation of the overall stability of the goaf at the Sanguikou Lead-Zinc Mine in Urad Rear Banner Zijin Mining, some of the pillar resources remaining in stope are in a position to be recovered. To clarify the impact of the pillar recovery on the surface deformation at 630 m level and above, it predicts the surface subsidence law and strata movement range, and evaluate the possible impact of related mining activities. This paper is based on the probability integral method of random medium theory to analyze the theoretical calculation of the surface movement and subsidence of the pillar recovery, using the three-dimensional goaf scanning method to establish a refined model of goaf and pillars, and using the FLAC3D numerical simulation systematically to research the impact of the pillar recovery on the surface subsidence. The results show that the maximum surface subsidence and horizontal movement values in the theoretical calculation and numerical simulation results are the same for the pillar recovery scheme with a safety class I. The influence range of the surface and the subsidence distribution law determined by both are also basically the same, which are mainly concentrated in the dense area of the pillars and the goaf. At the same time, the maximum inclination of the surface is much less than 1 mm/m, the maximum curvature is much less than 0.05 mm/m2, and the maximum horizontal deformation is far less than 1 mm/m, which indicates that the surface deformation and subsidence are within a safe range after the pillar recovery, and the surface collapse and other disasters do not occur due to the pillar recovery. The results of the research provide theoretical support for the subsequent mining of the mine.

       

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