黄金科学技术 ›› 2019, Vol. 27 ›› Issue (3): 358-367.doi: 10.11872/j.issn.1005-2518.2019.03.358
• 采选技术与矿山管理 • 上一篇
梁瑞1(),俞瑞利1(),周文海1,黄小彬2,王建勇3,熊征宇3
Rui LIANG1(),Ruili YU1(),Wenhai ZHOU1,Xiaobin HUANG2,Jianyong WANG3,Zhengyu XIONG3
摘要:
针对矿房回采时连续装药爆破造成的大块率高、振动大的问题,建立了4种不同空气柱长度和不同装药量的空气间隔装药结构爆破数值模型。通过分析各装药结构爆破时炮孔内与崩矿自由面上的爆炸应力场,得到在一定工程范围内,装药量相同的情况下,有效应力随空气柱长度的增大而减小;当空气柱长度相同时,装药量越大,有效应力越大;应力峰值呈现出在装药段处最大、空气段处减小及空气段中部应力最小的规律,与理论分析基本吻合。运用Von Mises屈服准则判断是否发生破坏,并通过分析自由面上质点的振动速度来反映爆破效果,选出最佳装药结构方案。
中图分类号:
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