露天坑排尾对采空区影响的数学预测及其稳定性

发布时间：2018-03-16 08:53

本文选题：露天坑排尾　切入点：双空区　出处：《东北大学学报(自然科学版)》2017年04期 　论文类型：期刊论文

【摘要】：为揭示露天坑干堆排尾堆高(H)对采空区跨度(D)与境界顶柱高(h)的影响,采用FLAC3D对不同跨度的双空区在尾砂回填过程中进行开挖模拟,并结合曲线拟合、传统破坏判据及厚度折减法,分别对地下双空区的受力、塑性区及关键点位移等特征进行分析及数学预测.研究表明:当D不变时,拉、压应力及塑性区面积均随H的增大而增加,且在D20 m后位移变化率明显增大;当H不变时,监测位移和塑性区随D增大而增加,且定量预测出D=26 m时,上下空区临界破坏对应的H分别为182.44,189.85 m.当D与H均变化时,双空区的塑性区逐渐呈现"蝴蝶状",上部空区的塑性区域明显大于下部,且在D20 m,H150 m时,上部空区出现与露天坑底贯穿现象.
[Abstract]:In order to reveal the influence of open-pit dry reactor stack height (H) on the span of goaf (D) and the height of boundary top column (h), FLAC3D was used to simulate the excavation of different span double empty areas in the process of tailings backfilling, and combined with curve fitting. The traditional failure criterion and thickness reduction method are used to analyze and predict the characteristics of stress, plastic zone and displacement of key points respectively. The compressive stress and plastic zone area increase with the increase of H, and the displacement rate increases obviously after D 20 m, and when H is invariant, the monitoring displacement and plastic zone increase with the increase of D, and the D ~ (26 m) is quantitatively predicted. The critical failure of upper and lower voids corresponding to H is 182.44 / 189.85 m respectively. When D and H are both changing, the plastic zone of the double empty zone is gradually "butterfly", and the plastic region of the upper void is obviously larger than that of the lower, and when D _ (20) m ~ (H) 150 m, the plastic zone of the upper hollow zone is larger than that of the lower part. The upper hollow area appears and the open pit bottom penetrates the phenomenon.
【作者单位】：中南大学资源与安全工程学院;
【基金】：“十二五”国家科技支撑计划项目(2013BAB02B05)
【分类号】：TD325.3

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