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| Fracture behavior of red sandstone under copper wire electric explosion |
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Received:December 05, 2021
Revised:December 29, 2021
Accepted:January 05, 2022
Published Online:June 10, 2022
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| DOI： |
| KeyWord:electric explosion of wires; red sandstone; discharge voltage; explosion source; crack propagation; rock blasting |
| Author | Institution |
| WANG Zhaohan |
东北大学 深部金属矿山安全开采教育部重点实验室 |
| ZHANG Chenhui |
东北大学 深部金属矿山安全开采教育部重点实验室 |
| YU Hang |
东北大学 深部金属矿山安全开采教育部重点实验室 |
| KUANG Chunlin |
东北大学 深部金属矿山安全开采教育部重点实验室 |
| ZHANG Fengpeng |
东北大学 深部金属矿山安全开采教育部重点实验室 |
| PENG Jianyu |
东北大学 深部金属矿山安全开采教育部重点实验室 |
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| Abstract: |
| Wire electric explosion for breaking rock is environmental and promising technology. To understand the fracture behavior of rocks under wire electric explosion, this study carried out model experiments of copper wire electric explosion for breaking red sandstone by using a high voltage pulse discharges apparatus. The process of crack initiation and propagation on the surface of the specimen was observed by using an ultra-high speed camera. The effects of discharge voltage and explosion source location on the rock fracturing were analyzed. This experimental study is innovative. The experimental results show that the fracture behavior was related to the discharge voltage. Under the discharging voltage of 30 kV, the electric explosion of metal wire did not effectively break the red sandstone. However, under the discharging voltage of 40 kV, there are several macroscopic cracks in the red sandstone, and the specimen was broken into fragments. In addition, as the distance between the explosion source and the surface of the specimen decreases, the cracks on the surface become more developed and the fracture of red sandstone becomes more serious. |
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