2018: 陡倾矿体充填法采矿充填体稳定性研究. 工程地质学报, 26(5): 1351-1359. DOI: 10.13544/j.cnki.jeg.2018272
    引用本文: 2018: 陡倾矿体充填法采矿充填体稳定性研究. 工程地质学报, 26(5): 1351-1359. DOI: 10.13544/j.cnki.jeg.2018272
    2018: BACKFILL STABILITY ANALYSIS OF STEEP DIP MINE USING FILLING METHOD. JOURNAL OF ENGINEERING GEOLOGY, 26(5): 1351-1359. DOI: 10.13544/j.cnki.jeg.2018272
    Citation: 2018: BACKFILL STABILITY ANALYSIS OF STEEP DIP MINE USING FILLING METHOD. JOURNAL OF ENGINEERING GEOLOGY, 26(5): 1351-1359. DOI: 10.13544/j.cnki.jeg.2018272

    陡倾矿体充填法采矿充填体稳定性研究

    BACKFILL STABILITY ANALYSIS OF STEEP DIP MINE USING FILLING METHOD

    • 摘要: 理论研究是分析力学问题基本手段,应用理论方法分析充填体整体稳定性的前提条件是存在明确的滑移面。前人许多研究成果基于考虑充填体与围岩接触面即为滑移面,但将接触面作为滑移面分析充填体稳定性缺少数据支持。本文结合前人研究成果,并根据金川二矿区地表变形特征,考虑倾斜(直线和曲线)滑移面,进而解析得到充填体内部竖向应力微分表达式;根据二矿区开采分层充填体的实际情况,考虑为简支梁模型,求得分层充填体局部稳定性的理论解析解;运用数值模拟软件分析二矿区充填体底板最大、最小主应力,判断了充填体发生破坏失稳的可能性。结果表明:充填体不会发生整体失稳垮塌,但充填体局部发生变形破坏的可能性还是存在的,对于双中段开采的上部采空区,充填体发生变形破坏的可能位置位于两侧角点,对于双中段开采的下部采空区,变形破坏位置稍有扩大,但也集中在两侧角点附近,应及时采取合理的支护措施,防止发生充填体局部失稳破坏。

       

      Abstract: Theoretical research method is the basic way to analyze mechanical problem. The obvious slip plane is the precondition to backfill overall stability analysis using the theoretical research method. The predecessor research results show that the interface of backfill and surrounding rock is the kind of slip plane, but the data that used to analyze the backfill stability is lack. Based on the predecessor research results, this study obtains the vertical stress differential expression in the backfill combining the inclined slip plane and ground deformation of No.2 Zone of Jinchuan Mine. Considering the sliced backfill of No. 2 Mine zone, the simply supported beam model is used to calculate the local stability of backfill. We use the numerical simulative software to analyze the maximum and minimum principal stresses of the backfill footwall, and provide the judgment of the backfill failure. The results show that the overall failure can't occur, but the local failure could occur. The upper void of two sub-levels mining leads to the deformation and failure concentrated on the corners of both sides. For the bottom void, the deformation range extends and also concentrates at corner of both sides. We should make some support in time and prevent the backfill local failure.

       

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