沙漠特厚风砂层下某铁矿水平隔离矿柱厚度的确定

某铁矿山围岩不稳固、矿体赋存在沙漠特厚风砂层下。由于风砂粒度细、流动性好，应用崩落法开采贫化率和损失率很高。为保证下部矿体安全高效开采，提出了在风砂层与矿体的接触面以下留设水平隔离矿柱的方案。研究采用经验公式和FLAC3D数值模拟相结合确定了水平隔离矿柱的合理厚度。结果表明，在采用隔一采一的无间柱分段空场嗣后充填法分条开采跨度为10 m的矿房时，留设的20 m隔离矿柱是稳定的。

Thickness Determination of an Iron Mine's Horizontal Barrier Pillar under the Desert's Extra Aeolian Sand layer

With weak surrounding rock，the ore body of an iron mine exists under the extra aeolian sand layer. Due to its small particle size and good liquidity，the caving method easily results in high dilution rate and loss rate. To ensure the safe and high-efficient mining of the lower ore-body，the project that keeps some horizontal barrier pillars under the contact surface of the Aeolian sand layer and ore body is put forward. The reasonable thickness of the horizontal barrier pillar is determined with the combination of the empirical formula and the numerical simulation FLAC3D. The results show that when extracting the 10 m span room without rib pillars by the open sublevel stoping method with subsequent backfilling and "taking one every the other one"，the setting-up 20 m barrier pillars are competent.