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DOI:
有色金属(矿山部分):2022,74(3):24-30
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束状孔爆破增强岩石损伤试验
陈 何1,2, 万串串1,2, 彭啸鹏1,2
((1.矿冶科技集团有限公司,北京100160; 2.国家金属矿绿色开采国际联合研究中心,北京102628))
Experiment on strengthening rock damage by bunch-holes blasting
CHEN He1,2, WAN Chuanchuan1,2, PENG Xiaopeng1,2
((1.BGRIMM Technology Group, Beijing 100160, China; 2. National Center for International Joint Research on Green Metal Mining, Beijing 102628, China))
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投稿时间:2022-02-28    修订日期:2022-03-17
中文摘要: 采用小型爆破试验方法,开展不同束状孔间距、不同当量大孔间距条件下的爆破损伤试验。结果显示,单束孔或单个当量大孔爆破时,药包侧面爆破损伤范围较两端大,且损伤岩石的纵波速度较低。随离药包的距离增加,爆破损伤变量值呈指数下降,当量大孔损伤变量值较束状孔的衰减更快。在爆破近区(x<5.56 D0),当量大孔损伤变量值较束状孔的高。在爆破中远区(x>5.56D0),束状孔损伤变量值较当量大孔的高。束状孔组与当量大孔组爆破时,组间距增加,组间岩石的损伤变量值下降。相同间距条件下,束状孔间岩石的爆破损伤变量值大于或等于当量大孔损伤变量值。束状孔/当量大孔间距1.5 m(16.67D0)、2.0 m(22.22D0)时,在组间的爆破叠加破坏作用较单孔损伤变量值增加30%40%。
Abstract:The blasting damage test under the conditions of different bunch-holes spacing and equivalent large hole(ELH) spacing carry out in a small-scale field test. When blasting with single bunch-holes or single ELH, the damage range of side blasting of charge is larger than that of both ends, and the P wave velocity of damaged rock is lower. With the increase of the distance from the charge, the damage variable decreases exponentially, and the ELH damage variable decreases faster than that of the bunch-holes. In the near blasting area (x < 5.56), the damage variable of ELH is higher than that of bundle-holes. In the middle and far zone of blasting (x > 5.56), the damage variable of bunch-holes is higher than that of ELH. During blasting of the bunch-holes group and ELH group, the group spacing increases, and the damage variable of rock between groups decreases. Under the condition of the same spacing, the blasting damage variable of rock between bunch-holes is greater than or equal to the ELH damage variable. When the spacing of bunch-holes / ELH is 1.5 m(16.67)、2.0 m(22.22), the superposition damage between groups increases by 30% ~ 40% compared with the value of the single hole damage variable.
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基金项目:国家重点研发计划项目(2017YFC0602904)
引用文本:
陈 何,万串串,彭啸鹏.束状孔爆破增强岩石损伤试验[J].有色金属(矿山部分),2022,74(3):24-30.
CHEN He,WAN Chuanchuan,PENG Xiaopeng.Experiment on strengthening rock damage by bunch-holes blasting[J].NONFERROUS METALS(Mining Section),2022,74(3):24-30.

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