Blast-Induced Damage on Millisecond Blasting Model Test with Multicircle Vertical Blastholes
To investigate the blast-induced damage effect on surrounding rock in vertical shaft excavation, 4 kinds of millisecond blasting model tests with three-circle blastholes were designed and carried out with excavation blasting in vertical shaft as the background. The longitudinal wave velocity on the...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2015-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2015/504043 |
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| _version_ | 1832563340303400960 |
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| author | Qin-yong Ma Pu Yuan Jing-shuang Zhang Rui-qiu Ma Bo Han |
| author_facet | Qin-yong Ma Pu Yuan Jing-shuang Zhang Rui-qiu Ma Bo Han |
| author_sort | Qin-yong Ma |
| collection | DOAJ |
| description | To investigate the blast-induced damage effect on surrounding rock in vertical shaft excavation, 4 kinds of millisecond blasting model tests with three-circle blastholes were designed and carried out with excavation blasting in vertical shaft as the background. The longitudinal wave velocity on the side of concrete model was also measured before and after blasting. Then blast damage factor was then calculated by measuring longitudinal wave velocity before and after blasting. The test results show that the blast-induced damage factor attenuated gradually with the centre of three-circle blastholes as centre. With the threshold value of 0.19 for blast-induced damage factor, blast-induced damage zones for 4 kinds of model tests are described and there is an inverted cone blast-induced damage zone in concrete model. And analyses of cutting effect and blast-induced damage zone indicate that in order to minimize the blast-induced damage effect and ensure the cutting effect the reasonable blasting scheme for three-circle blastholes is the inner two-circle blastholes initiated simultaneously and the outer third circle blastholes initiated in a 25 ms delay. |
| format | Article |
| id | doaj-art-1bda3d43db184fa996c731d7758960b3 |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2015-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-1bda3d43db184fa996c731d7758960b32025-02-03T01:20:23ZengWileyShock and Vibration1070-96221875-92032015-01-01201510.1155/2015/504043504043Blast-Induced Damage on Millisecond Blasting Model Test with Multicircle Vertical BlastholesQin-yong Ma0Pu Yuan1Jing-shuang Zhang2Rui-qiu Ma3Bo Han4Research Center of Mine Underground Engineering, Ministry of Education, Anhui University of Science and Technology, Huainan, Anhui 232001, ChinaResearch Center of Mine Underground Engineering, Ministry of Education, Anhui University of Science and Technology, Huainan, Anhui 232001, ChinaResearch Center of Mine Underground Engineering, Ministry of Education, Anhui University of Science and Technology, Huainan, Anhui 232001, ChinaResearch Center of Mine Underground Engineering, Ministry of Education, Anhui University of Science and Technology, Huainan, Anhui 232001, ChinaResearch Center of Mine Underground Engineering, Ministry of Education, Anhui University of Science and Technology, Huainan, Anhui 232001, ChinaTo investigate the blast-induced damage effect on surrounding rock in vertical shaft excavation, 4 kinds of millisecond blasting model tests with three-circle blastholes were designed and carried out with excavation blasting in vertical shaft as the background. The longitudinal wave velocity on the side of concrete model was also measured before and after blasting. Then blast damage factor was then calculated by measuring longitudinal wave velocity before and after blasting. The test results show that the blast-induced damage factor attenuated gradually with the centre of three-circle blastholes as centre. With the threshold value of 0.19 for blast-induced damage factor, blast-induced damage zones for 4 kinds of model tests are described and there is an inverted cone blast-induced damage zone in concrete model. And analyses of cutting effect and blast-induced damage zone indicate that in order to minimize the blast-induced damage effect and ensure the cutting effect the reasonable blasting scheme for three-circle blastholes is the inner two-circle blastholes initiated simultaneously and the outer third circle blastholes initiated in a 25 ms delay.http://dx.doi.org/10.1155/2015/504043 |
| spellingShingle | Qin-yong Ma Pu Yuan Jing-shuang Zhang Rui-qiu Ma Bo Han Blast-Induced Damage on Millisecond Blasting Model Test with Multicircle Vertical Blastholes Shock and Vibration |
| title | Blast-Induced Damage on Millisecond Blasting Model Test with Multicircle Vertical Blastholes |
| title_full | Blast-Induced Damage on Millisecond Blasting Model Test with Multicircle Vertical Blastholes |
| title_fullStr | Blast-Induced Damage on Millisecond Blasting Model Test with Multicircle Vertical Blastholes |
| title_full_unstemmed | Blast-Induced Damage on Millisecond Blasting Model Test with Multicircle Vertical Blastholes |
| title_short | Blast-Induced Damage on Millisecond Blasting Model Test with Multicircle Vertical Blastholes |
| title_sort | blast induced damage on millisecond blasting model test with multicircle vertical blastholes |
| url | http://dx.doi.org/10.1155/2015/504043 |
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