点柱式上向水平分层充填法充填采场稳定性研究

Study on filling stope stability of upward horizontal slicing filling method with point pillars

为了确保大尹格庄金矿采场安全,提高资源回收率,对-380、-496、-556、-616水平一些采场矿柱进行调查,总结发现矿柱受结构面的方向控制,呈现不同的破坏模式,大致可分为节理组平行矿柱壁面、节理组与矿柱斜交、节理面平行于顶板;建立了矿柱宽度、矿房顶板跨度及矿体开采深度与矿柱安全系数的关系式,分析得到矿柱宽度对矿柱安全系数的影响作用最大,其次为矿体开采深度,最后为矿房顶板跨度;对目标采场矿柱进行稳定性评价,得到各矿柱的安全系数,圈定出了不稳定矿柱;最后对-616水平顶板极限跨度及矿柱尺寸进行计算得到顶板极限跨度为8.2m,矿柱宽度应大于4.1m。

In order to ensure the stope safety of Dayingezhuang Gold Mine and improve resource recovery, through investigating some stope pillars on the level of -- 380, -- 496, -- 556, -- 616, it is concluded that parts of pillars controlled by structure of direction showing different failure modes which can be divided into parallel between joint and pillars, skew between joint set and pillars and parallel between joint and roof. Through establishing the relationship between width of pillar, stope span, mining depth and safety coefficient of pillars, the result shows that the effect of pillar width on safety coefficient is the most important one, followed by mining depth, and the last one is stope span. Through evaluating the stability of pillars, safety coefficient of every pillar and unstable pillars are got. Finally by means of calculating, the conclusion can be drawn that the minimal roof span is 8.2 meters and the width of the pillar should be greater than 4.1 meters.