深孔爆破对隐患资源开采两帮的动力响应特性研究

发布时间：2018-03-26 06:22

本文选题：隐患资源　切入点：深孔爆破　出处：《爆破》2017年04期

【摘要】：隐患资源安全开采是采矿工程领域面临的难点问题。结合某铅锌矿隐患资源开采工程实际情况,利用显示动力分析软件LS-DYNA构建深孔爆破荷载作用下充填体动力响应的数值仿真模型;设计了5种不同装药结构,分析爆炸应力波在充填体环境下的传播特征。结果表明:隐患资源两帮受到的拉应力小于其动态抗拉强度,两帮不会发生"片落";采用不耦合装药并且空气间隔系数为0.52可以使爆破应力分布更均匀;爆破振动速度和应力叠加使药包中心点到充填体的投影位置的速度和应力达到最大值;爆破参数为:炮孔直径为110 mm,排距×孔距=2.0 m×1.8 m,边孔与充填体之间的距离为1 m,一卷炸药(长0.67 m,直径90 mm)+1 m空气间隔的边孔装药结构即方案4。现场试验表明,优化的装药结构可以较好解决深孔爆破对隐患资源开采稳定性的问题。
[Abstract]:The safe mining of hidden danger resources is a difficult problem in the field of mining engineering. The numerical simulation model of dynamic response of filling body under deep hole blasting load is constructed by using the display dynamic analysis software LS-DYNA, and five different charge structures are designed. The propagation characteristics of explosive stress wave in the filling environment are analyzed. The results show that the tensile stress of the two sides of the hidden resources is less than its dynamic tensile strength. The "flake" will not occur in the two sides, and the blasting stress distribution can be more uniform by using the uncoupled charge and the air spacing coefficient of 0.52. The velocity of blasting vibration and the superposition of stress make the velocity and stress of projective position from the center of charge to the filling body reach the maximum value. The blasting parameters are as follows: the diameter of the hole is 110 mm, the distance between the row and the hole is 2.0 m 脳 1.8 m, the distance between the edge hole and the filling body is 1 m, and the charge structure of one roll of explosive (0.67 m in length, 90 mm in diameter) with 1 m air interval is the scheme 4. The optimized charging structure can solve the problem of the stability of deep hole blasting on the exploitation of hidden danger resources.
【作者单位】：中南大学资源与安全工程学院;
【基金】：国家自然科学基金项目(51274250) 中南大学研究生自主探索创新项目(2016zzts091)
【分类号】：TD235.33

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