中深孔一次爆破成井掏槽爆破方式优化研究
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中色非洲矿业有限公司

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Optimization Study on the Undercut Blasting Method of Disposable Blasting Well in Middle-deep Holes
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NFC Africa Mining PLC

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    摘要:

    合理的天井一次爆破成井掏槽爆破方案对于保障矿山的安全高效生产具有关键性的作用,本文利用Ansys/LS-DYNA软件分别对两种掏槽方案进行了数值模拟分析。根据分析可知最终形成的天井断面尺寸满足设计要求,槽腔断面呈现出两端大中间小的特点,具有较好的掏槽效果;对比在不同监测点的峰值振动速度说明:方案一(九大孔附加四小孔掏槽方式)控制爆破振动效果明显优于方案二(九孔掏槽方式);综合掏槽效果,凿岩成本和对爆破振动的控制效果,需要对周围岩体进行保护时应该选用方案一;不需要对周围岩体进行适当保护时应该选用方案二。矿山现场试验中两种方案均达到了预期的掏槽爆破效果。研究结果为矿山一次爆破成井技术方案选择提供了参考。

    Abstract:

    In this paper, numerical simulation analysis of two Undercut schemes was carried out using Ansys/LS-DYNA software to ensure the safe and efficient production of the mine. According to the analysis, the final section size of the raise meets the design requirements, and the section of the cavity shows the characteristics of large at both ends and small in the middle, which has a good Undercutting effect; comparing the peak vibration speed at each point shows that the blasting vibration control effect of Option 1 (Nine large holes plus four small holes hollowing method) is significantly better than that of Option 2(nine-hole hollowing method). Option 1 should be used when the offset rate is large and the surrounding rock needs to be protected; Option 2 should be used when the offset rate is small and the surrounding rock does not need to be protected. Both options achieved the expected Undercutting results in the mine field tests. The results of the study provide a reasonable solution for the process of disposable blasting well.

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  • 收稿日期:2022-12-02
  • 最后修改日期:2022-12-28
  • 录用日期:2023-01-13
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