| 矿岩分离露天爆破毫秒延时间隔研究 |
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| 引用本文： | 李顺波,李泽华,杨军,王洪强,余德运. 矿岩分离露天爆破毫秒延时间隔研究[J]. 爆破器材, 2019, 48(3): 55-58. DOI: 10.3969/j.issn.1001-8352.2019.03.011 |
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| 作者姓名： | 李顺波 李泽华 杨军 王洪强 余德运 |
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| 作者单位： | 北方爆破科技有限公司 北京,100089;北京理工大学爆炸科技与技术国家重点实验室 北京,100081 |
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| 摘 要： | 在露天矿山开采过程中，矿石损失与贫化反映了矿产资源的有效利用程度，是评价矿床开采水平的主要指标之一。露天台阶爆破推进至矿岩交界处时，损失、贫化都会相应增加。通过应力波相互作用关系和自由面形成所需的时间对矿岩分离爆破毫秒延时间隔进行了分析，得到了矿岩分界线两侧的孔需要同时起爆，与其相邻孔的延时间隔时间设定为100 ms的爆破方法。现场试验应用表明，在矿岩分界线处可以形成明显的拉沟现象。
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| 关 键 词： | 矿岩分离 损失 贫化 毫秒延时 |
Research on Millisecond Delay Interval of Open Blasting for Separation of Ore and Rock |
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| LI Shunbo①,LI Zehua①,YANG Jun②,WANG Hongqiang①,YU Deyun①. Research on Millisecond Delay Interval of Open Blasting for Separation of Ore and Rock[J]. Explosive Materials, 2019, 48(3): 55-58. DOI: 10.3969/j.issn.1001-8352.2019.03.011 |
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| Authors: | LI Shunbo① LI Zehua① YANG Jun② WANG Hongqiang① YU Deyun① |
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| Affiliation: | ①North Blasting Technology Co., Ltd. (Beijing, 100089) ②State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology (Beijing,100081) |
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| Abstract: | In the process of open-pit mining, ore loss and dilution which reflect the utilization efficiency of mineral resources is one of the main indicators to evaluate the level of mining. When the open-pit bench blasting is advanced to the junction of ore and rock, the loss and dilution will increase correspondingly. The millisecond delay time interval of ore-rock separation blasting was analyzed by the interaction of stress wave and the formation of free surface. The blasting method that the delay time interval between the two sides of ore-rock boundary needs to be set at 100 ms is identified. Application of field test shows that obvious trenching phenomenon can be formed at the ore-rock boundary. |
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| Keywords: | separation of ore and rock loss dilution millisecond delay |
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