潘俊,罗志华,史秀志,邱贤阳,李小元

• 1:中南大学资源与安全工程学院
• 2:深圳市中金岭南凡口铅锌矿有限公司
• 3:广西中金岭南矿业有限责任公司

摘要(Abstract)：

井下垂直深孔爆破因自由面受限、能量释放通道单一，对堵塞长度高度敏感，其合理取值直接影响爆破能量利用与块度分布。文章借助理论分析、模型试验、LS-DYNA数值模拟和现场试验，探究堵塞长度对垂直深孔爆破的影响。理论分析显示:在抵抗线5 cm条件下，堵塞长度5 cm时孔内应力衰减最慢。模型试验采用混凝土试块，固定抵抗线5 cm，设置堵塞长度0 cm、2 cm、4 cm、5 cm四组方案，结果表明:爆破漏斗半径和爆堆质量随堵塞长度增加先升后稳，5 cm时漏斗半径达7.9 cm，爆堆质量207.96 g，块度均匀性最佳。在现场试验中，按照相似比换算后采用1.0 m堵塞，获得块度均匀且无冲孔现象，验证了5 cm为最优堵塞长度的结论。研究成果为优化井下垂直深孔爆破工艺提供了理论与实践依据。

关键词(KeyWords)： 堵塞长度;垂直深孔爆破;孔壁应力;等效漏斗半径;爆破效果

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金面上项目(52374152);; 广西重点研发项目(2022AB31023)~~

作者(Author): 潘俊,罗志华,史秀志,邱贤阳,李小元

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