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對金川礦區不良巖體水平巷道地壓活動規律的幾點認識

  • 摘要: 本文著重闡述了對金川礦區不良巖體平巷地壓活動規律的幾點看法。通過現場調查,特別是根據較大量的現場圍巖變形量測的資料,結合進行非線性YPZ-2程序的有限元分析和室內模型試驗。采用這些綜合方法研究,得出如下規律:1.金川礦區不良巖體具有明顯的流變特征,如果支護得當,多數巷道地壓基本屬于穩定性流變地壓。2.金川二礦區Ⅱ-Ⅱ巖組噴錨網支護的雙軌巷道圍巖移動范圍約為8~9米,圍巖松動圈一般大于1.5米,小于2.5米。3.巷道圍巖內出現兩個壓縮區,一個膨脹區和一個松動區。壓縮區對圃巖起支撐作用,而松動區別為支護所抑制,從而使巷道處于穩定狀態。4.金川礦區巖體存在較大的水平構造應力,它對巷道地壓活動特點有重要影響:5.金川礦區在以綠泥石片巖為代表的膨脹性巖石中,在風干、遇水后將產生不可忽視的膨脹壓力。
    最后,本文依據巖石力學原理從巷道布置、巷道形狀,支護結構、支護施工程序和排水疏干等方面扼要地提出了金川礦區不良巖體巷道地壓控制的主要方法和措施,強調采用監控法施工,使巷道維護既安全又經濟。

     

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