三山岛金矿是中国第一个滨海开采的大型蚀变岩型金矿床,其直属矿区水文地质条件复杂.三山岛金矿直属矿区一直沿用点柱式上向水平分层充填采矿法开采,该采矿法开采时预留了采场间柱、采场顶底柱、采场矿石点柱、上盘护顶矿等,由此造成的分层损失超过13%,总损失率高达23.1%,为解决三山岛金矿直属矿区矿体安全回采的技术难题,需研究取消矿柱的合理位置.通过不同开采深度的分界高度模拟,进行了不同分界深度地表沉降、等效应力对比、弹塑性应变对比、采场竖向变形分析.研究结果显示,当开采深度小于2400 m 时,分界高度取-510 m 比较适宜.
Sanshandao gold mine of Shandong Gold Mining (Laizhou) Co.,Ltd.is China's first large altered rock type coastal gold deposit,where the hydrogeological conditions in the mining area are complex .Sanshandao gold mine has been using the upward horizontal slice stoping and backfilling method with random pillars .With this method,barri-er pillars,sill and crown pillars,random stope pillars,and hangingwall support pillars are left ,as a result of which the loss of ore in slice stoping exceeds 13 % and the total loss is as high as 23.1 %.To solve the technical problems of safe stoping in direct mining area of Sanshandao gold mine ,the proper locations to omit pillars are discussed .Through the simulation of boundary depth for omitting pillars in different mining depth ,surface subsidence,comparison of e-quivalent strength,elastoplasticity and vertical deformation of the stope and so on are analyzed .The results show that the boundary depth should be -510m when the mining depth is less than 2 400 m.
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