Investigation on Cutting Blasting Efficiency of Hard Rock Tunnels under Different Charge Diameters
Considering the low efficiency of cutting blasting in hard rock mine tunnels, a novel solution of increasing the charge diameter of the cutting holes was put forward. To investigate the influence of the charge diameter on the cutting blasting results, three different working conditions of Φ 32 mm, Φ...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-10-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/19/9906 |
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| author | Pengfei Gao Qi Zong Bing Cheng Haibo Wang Ying Xu Binbin Zhang |
| author_facet | Pengfei Gao Qi Zong Bing Cheng Haibo Wang Ying Xu Binbin Zhang |
| author_sort | Pengfei Gao |
| collection | DOAJ |
| description | Considering the low efficiency of cutting blasting in hard rock mine tunnels, a novel solution of increasing the charge diameter of the cutting holes was put forward. To investigate the influence of the charge diameter on the cutting blasting results, three different working conditions of Φ 32 mm, Φ 42 mm, and Φ 50 mm blasting holes combined with Φ 27 mm, Φ 35 mm, and Φ 45 mm cartridges, respectively, were taken as the investigation objects. At first, the theoretical destruction ranges of single cutting holes under the three different charge diameters were computed. The computed results showed that the destruction range of the cutting holes could be expanded by increasing the charge diameter, which would be beneficial to the destruction of the rock far away from the cutting holes in the cutting cavity. Subsequently, numerical simulations of cutting blasting under the three different charge diameters were performed to display the dynamic propagation process of the blasting stress wave. Importantly, the stress field intensity in the cutting cavity was enhanced significantly with the charge diameter. The stronger stress field intensities generated by the larger diameter charges were more conducive to breaking the rock in the cutting cavity into small fragments that were easy to be discarded. Ultimately, a hard rock vertical slope was used instead of the driving face to carry out the cutting blasting experiments, and the hole utilizations of the cutting blasting were 70.4%, 82.0%, and 94.0%, respectively, under the three different charge diameters, from small to large. The experimental results forcefully substantiated that a higher cutting blasting efficiency could be achieved by increasing the charge diameter of cutting holes in hard rock mine tunnels. |
| first_indexed | 2024-03-09T22:02:32Z |
| format | Article |
| id | doaj.art-621d9f3d1984444595ced7ac8e30bd6a |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-09T22:02:32Z |
| publishDate | 2022-10-01 |
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| series | Applied Sciences |
| spelling | doaj.art-621d9f3d1984444595ced7ac8e30bd6a2023-11-23T19:47:37ZengMDPI AGApplied Sciences2076-34172022-10-011219990610.3390/app12199906Investigation on Cutting Blasting Efficiency of Hard Rock Tunnels under Different Charge DiametersPengfei Gao0Qi Zong1Bing Cheng2Haibo Wang3Ying Xu4Binbin Zhang5School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, ChinaSchool of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, ChinaSchool of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, ChinaSchool of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, ChinaSchool of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, ChinaSchool of Chemical Engineering, Anhui University of Science and Technology, Huainan 232001, ChinaConsidering the low efficiency of cutting blasting in hard rock mine tunnels, a novel solution of increasing the charge diameter of the cutting holes was put forward. To investigate the influence of the charge diameter on the cutting blasting results, three different working conditions of Φ 32 mm, Φ 42 mm, and Φ 50 mm blasting holes combined with Φ 27 mm, Φ 35 mm, and Φ 45 mm cartridges, respectively, were taken as the investigation objects. At first, the theoretical destruction ranges of single cutting holes under the three different charge diameters were computed. The computed results showed that the destruction range of the cutting holes could be expanded by increasing the charge diameter, which would be beneficial to the destruction of the rock far away from the cutting holes in the cutting cavity. Subsequently, numerical simulations of cutting blasting under the three different charge diameters were performed to display the dynamic propagation process of the blasting stress wave. Importantly, the stress field intensity in the cutting cavity was enhanced significantly with the charge diameter. The stronger stress field intensities generated by the larger diameter charges were more conducive to breaking the rock in the cutting cavity into small fragments that were easy to be discarded. Ultimately, a hard rock vertical slope was used instead of the driving face to carry out the cutting blasting experiments, and the hole utilizations of the cutting blasting were 70.4%, 82.0%, and 94.0%, respectively, under the three different charge diameters, from small to large. The experimental results forcefully substantiated that a higher cutting blasting efficiency could be achieved by increasing the charge diameter of cutting holes in hard rock mine tunnels.https://www.mdpi.com/2076-3417/12/19/9906hard rock tunnelcutting blasting efficiencycharge diameterdestruction rangenumerical simulationcutting blasting experiment |
| spellingShingle | Pengfei Gao Qi Zong Bing Cheng Haibo Wang Ying Xu Binbin Zhang Investigation on Cutting Blasting Efficiency of Hard Rock Tunnels under Different Charge Diameters Applied Sciences hard rock tunnel cutting blasting efficiency charge diameter destruction range numerical simulation cutting blasting experiment |
| title | Investigation on Cutting Blasting Efficiency of Hard Rock Tunnels under Different Charge Diameters |
| title_full | Investigation on Cutting Blasting Efficiency of Hard Rock Tunnels under Different Charge Diameters |
| title_fullStr | Investigation on Cutting Blasting Efficiency of Hard Rock Tunnels under Different Charge Diameters |
| title_full_unstemmed | Investigation on Cutting Blasting Efficiency of Hard Rock Tunnels under Different Charge Diameters |
| title_short | Investigation on Cutting Blasting Efficiency of Hard Rock Tunnels under Different Charge Diameters |
| title_sort | investigation on cutting blasting efficiency of hard rock tunnels under different charge diameters |
| topic | hard rock tunnel cutting blasting efficiency charge diameter destruction range numerical simulation cutting blasting experiment |
| url | https://www.mdpi.com/2076-3417/12/19/9906 |
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