Dynamic effects of deep-hole cumulative blasting in coal seam and its application
A model of cumulative blasting was established to study the mechanism of crack propagation and permeability increasing under cumulative blasting in a coal seam. The forming mechanism of shaped charge jet, the propagation characteristics of stress wave and detonation wave, the stress distribution cha...
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| Format: | Article |
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Science Press
2016-12-01
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| Series: | 工程科学学报 |
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| Online Access: | http://cje.ustb.edu.cn/article/doi/10.13374/j.issn2095-9389.2016.12.004 |
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| author | GUO De-yong ZHAO Jie-chao LÜ Peng-fei ZHAI Min |
| author_facet | GUO De-yong ZHAO Jie-chao LÜ Peng-fei ZHAI Min |
| author_sort | GUO De-yong |
| collection | DOAJ |
| description | A model of cumulative blasting was established to study the mechanism of crack propagation and permeability increasing under cumulative blasting in a coal seam. The forming mechanism of shaped charge jet, the propagation characteristics of stress wave and detonation wave, the stress distribution characteristics of coal elements, and the mechanism of crack extension under cumulative blasting were investigated by theoretical analysis and numerical simulation. It is found that the propagation characteristics of detonation wave promote the forming of cumulative jet, and change the propagation characteristics of stress wave and the stress distribution characteristics of coal elements significantly. The stress peak values of coal in the major and minor cumulative directions are 1.10-1.29 times that of coal in the non-cumulative direction, and the stress peak value of coal in the major cumulative direction increases from 0.85 times that of coal in the minor cumulative direction to 1.06 times in the range of blasting effect, slowing down the attenuation rate of the stress peak value of coal and increasing the crack propagation velocity. Besides, field experimental results of cumulative blasting in a coal seam indicate that the average concentration of extracted gas after blasting is 1.58 times that before blasting, and cumulative blasting can promote crack propagation effectively. |
| format | Article |
| id | doaj-art-5604c591cfd749f89862b5e77583f4c5 |
| institution | OA Journals |
| issn | 2095-9389 |
| language | zho |
| publishDate | 2016-12-01 |
| publisher | Science Press |
| record_format | Article |
| series | 工程科学学报 |
| spelling | doaj-art-5604c591cfd749f89862b5e77583f4c52025-08-20T01:47:52ZzhoScience Press工程科学学报2095-93892016-12-0138121681168710.13374/j.issn2095-9389.2016.12.004Dynamic effects of deep-hole cumulative blasting in coal seam and its applicationGUO De-yong0ZHAO Jie-chao1LÜ Peng-fei2ZHAI Min3School of Resource and Safety Engineering, China University of Mining and Technology(Beijing), Beijing 100083, ChinaSchool of Resource and Safety Engineering, China University of Mining and Technology(Beijing), Beijing 100083, ChinaSchool of Resource and Safety Engineering, China University of Mining and Technology(Beijing), Beijing 100083, ChinaSchool of Resource and Safety Engineering, China University of Mining and Technology(Beijing), Beijing 100083, ChinaA model of cumulative blasting was established to study the mechanism of crack propagation and permeability increasing under cumulative blasting in a coal seam. The forming mechanism of shaped charge jet, the propagation characteristics of stress wave and detonation wave, the stress distribution characteristics of coal elements, and the mechanism of crack extension under cumulative blasting were investigated by theoretical analysis and numerical simulation. It is found that the propagation characteristics of detonation wave promote the forming of cumulative jet, and change the propagation characteristics of stress wave and the stress distribution characteristics of coal elements significantly. The stress peak values of coal in the major and minor cumulative directions are 1.10-1.29 times that of coal in the non-cumulative direction, and the stress peak value of coal in the major cumulative direction increases from 0.85 times that of coal in the minor cumulative direction to 1.06 times in the range of blasting effect, slowing down the attenuation rate of the stress peak value of coal and increasing the crack propagation velocity. Besides, field experimental results of cumulative blasting in a coal seam indicate that the average concentration of extracted gas after blasting is 1.58 times that before blasting, and cumulative blasting can promote crack propagation effectively.http://cje.ustb.edu.cn/article/doi/10.13374/j.issn2095-9389.2016.12.004coal seamscumulative blastingcrack propagationantireflectionnumerical simulation |
| spellingShingle | GUO De-yong ZHAO Jie-chao LÜ Peng-fei ZHAI Min Dynamic effects of deep-hole cumulative blasting in coal seam and its application 工程科学学报 coal seams cumulative blasting crack propagation antireflection numerical simulation |
| title | Dynamic effects of deep-hole cumulative blasting in coal seam and its application |
| title_full | Dynamic effects of deep-hole cumulative blasting in coal seam and its application |
| title_fullStr | Dynamic effects of deep-hole cumulative blasting in coal seam and its application |
| title_full_unstemmed | Dynamic effects of deep-hole cumulative blasting in coal seam and its application |
| title_short | Dynamic effects of deep-hole cumulative blasting in coal seam and its application |
| title_sort | dynamic effects of deep hole cumulative blasting in coal seam and its application |
| topic | coal seams cumulative blasting crack propagation antireflection numerical simulation |
| url | http://cje.ustb.edu.cn/article/doi/10.13374/j.issn2095-9389.2016.12.004 |
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