束状孔爆破增强岩石损伤试验  

Experiment on strengthening rock damage by bunch-holes blasting

作　　者：陈何 万串串 彭啸鹏 CHEN He;WAN Chuanchuan;PENG Xiaopeng(BGRIMM Technology Group,Beijing 100160,China;National Center for International Joint Research on Green Metal Mining,Beijing 102628,China)

机构地区：[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

出　　处：《有色金属（矿山部分）》2022年第3期24-30,共7页NONFERROUS METALS(Mining Section）

基　　金：国家重点研发计划项目(2017YFC0602904)。

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下降更快。在爆破近区(x<5.56D_(0)),当量大孔损伤变量值较束状孔的高。在爆破中远区(x>5.56D_(0)),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(16.67D_(0))、2.0 m(22.22D_(0))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%。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<5.56D_(0)),the damage variable of ELH is higher than that of bundle-holes.In the middle and far zone of blasting(x>5.56D_(0)),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(16.67D_(0))、2.0 m(22.22D_(0)),the superposition damage between groups increases by 30%-40%compared with the value of the single hole damage variable.

关 键 词：爆破 束状孔 岩石损伤 现场试验 当量大孔 叠加破坏 

分 类 号：TD235[矿业工程—矿井建设]