为改善袁家村铁矿空区处理大块率较高的现状,采用有限元分析软件ANSYS/LS-DYNA建立三维单孔爆破数值模型,重点研究中深孔内起爆方式对岩石破碎效果的影响.根据模拟结果定性分析岩石破碎腔体形态以及定量分析失效单元数目.模拟结果显示:药柱中心位置起爆时中间破碎范围大于端部,中心位置径向最大破碎区直径约2 m.同时,药柱中心起爆方式拥有最大失效单元数目,共4631个.最终确定最佳起爆方式为药柱中心起爆.以数值模拟结论为基础,依据现场工况设计并实施崩落方案,通过对比爆破前后空区凹陷体积,认为采用药柱中心起爆方式控制下的空区顶板崩落效果较好,是理想的空区爆破处理方式.%In order to improve the situation of high boulder yield in goaf treatment of Yuanjiacun iron ore,the ANSYS/LS-DYNA was used to build the single borehole blasting numerical model,further to explore the influence of initiation type on rock fragmentation effect in deep borehole blasting.According to the simulation results,with qualitative discussion on the rock crushing cavity morphology and quantitative discussion on the number of invalid unit,the results showed that the middle initiation crushing range was larger than the end's,and the largest radial diameter of the crushing area was about 2 neters.Simultaneously,the largest number of failed units with middle initiation was 4631.Finally,the best way of initiation was center blasting.Based on the numerical simulation conclusion,the blasting program was designed and implemented according to the site conditions.By comparing the subsidence volume before and after the blasting,the center initiation was put forward as the optimal way to treat the goal caving.
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