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| Experiment on strengthening rock damage by bunch-holes blasting |
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Received:February 28, 2022
Revised:March 17, 2022
Accepted:March 21, 2022
Published Online:June 10, 2022
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| DOI： |
| KeyWord:blasting; bunch-holes; rock damage; field test; equivalent large hole(ELH); superposition damage |
| Author | Institution |
| CHEN He |
矿冶科技集团有限公司 |
| WAN Chuanchuan |
矿冶科技集团有限公司 |
| PENG Xiaopeng |
矿冶科技集团有限公司 |
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| 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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