Blast Hole Pressure Measurement and a Full-Scale Blasting Experiment in Hard Rock Quarry Mine Using Shock-Reactive Stemming Materials
By increasing the effectiveness of the energy generated by the explosive charge inserted into a blast hole, stemming increases rock fragmentation. Missing or improper stemming, which can lead to the detonation gas escaping from the blast hole in advance, results not only in the waste of explosive en...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-08-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/17/8629 |
| _version_ | 1797496351835029504 |
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| author | Younghun Ko Chanhwi Shin Youngjun Jeong Sangho Cho |
| author_facet | Younghun Ko Chanhwi Shin Youngjun Jeong Sangho Cho |
| author_sort | Younghun Ko |
| collection | DOAJ |
| description | By increasing the effectiveness of the energy generated by the explosive charge inserted into a blast hole, stemming increases rock fragmentation. Missing or improper stemming, which can lead to the detonation gas escaping from the blast hole in advance, results not only in the waste of explosive energy and poor fragmentation but also in environmental problems, such as ground vibration, noise, flying rocks, back breaks, and air blasts. In this study, a stemming material based on a shear thickening fluid (STF) that reacts to dynamic pressure was developed. Two blasting experiments were conducted to verify the performance of the STF-based stemming material. In the first experiment, the pressure inside the blast hole was directly measured based on the application of the stemming material. In the second experiment, full-scale bench blasting was performed, and the blasting results of sand stemming and the STF-based stemming cases were compared. The measurement results of the pressure in the blast hole showed that when the STF-based stemming material was applied, the pressure at the top of the blast hole was lower than in the sand stemming case, and the stemming ejection was also lower. Full-scale bench blasting was conducted to compare the two types of stemming materials by evaluating the size of the rock fragments using image processing. The results of the two blasting experiments helped to verify that the blockage performance of the STF-based stemming material in the blast hole was superior to that of the sand stemming material. |
| first_indexed | 2024-03-10T03:02:26Z |
| format | Article |
| id | doaj.art-202c91bc1563416c91bbb9d938aeb849 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T03:02:26Z |
| publishDate | 2022-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-202c91bc1563416c91bbb9d938aeb8492023-11-23T12:42:57ZengMDPI AGApplied Sciences2076-34172022-08-011217862910.3390/app12178629Blast Hole Pressure Measurement and a Full-Scale Blasting Experiment in Hard Rock Quarry Mine Using Shock-Reactive Stemming MaterialsYounghun Ko0Chanhwi Shin1Youngjun Jeong2Sangho Cho3Department of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology, 283 Goyang-daero, Ilsanseo-gu, Goyang-si 10223, KoreaDepartment of Energy Storage & Conversion Engineering of Graduate School, Jeonbuk National University, 567 Baekje-Daero, Deokjin-gu, Jeonju-si 54896, KoreaSeokseong Blasting Construction Co., Ltd., Wolgye-ro 37-gil, Gangbuk-gu, Seoul 01226, KoreaDepartment of Energy Storage & Conversion Engineering of Graduate School, Jeonbuk National University, 567 Baekje-Daero, Deokjin-gu, Jeonju-si 54896, KoreaBy increasing the effectiveness of the energy generated by the explosive charge inserted into a blast hole, stemming increases rock fragmentation. Missing or improper stemming, which can lead to the detonation gas escaping from the blast hole in advance, results not only in the waste of explosive energy and poor fragmentation but also in environmental problems, such as ground vibration, noise, flying rocks, back breaks, and air blasts. In this study, a stemming material based on a shear thickening fluid (STF) that reacts to dynamic pressure was developed. Two blasting experiments were conducted to verify the performance of the STF-based stemming material. In the first experiment, the pressure inside the blast hole was directly measured based on the application of the stemming material. In the second experiment, full-scale bench blasting was performed, and the blasting results of sand stemming and the STF-based stemming cases were compared. The measurement results of the pressure in the blast hole showed that when the STF-based stemming material was applied, the pressure at the top of the blast hole was lower than in the sand stemming case, and the stemming ejection was also lower. Full-scale bench blasting was conducted to compare the two types of stemming materials by evaluating the size of the rock fragments using image processing. The results of the two blasting experiments helped to verify that the blockage performance of the STF-based stemming material in the blast hole was superior to that of the sand stemming material.https://www.mdpi.com/2076-3417/12/17/8629blasting experimentstemming materialshear thickening fluidsandblockage performance |
| spellingShingle | Younghun Ko Chanhwi Shin Youngjun Jeong Sangho Cho Blast Hole Pressure Measurement and a Full-Scale Blasting Experiment in Hard Rock Quarry Mine Using Shock-Reactive Stemming Materials Applied Sciences blasting experiment stemming material shear thickening fluid sand blockage performance |
| title | Blast Hole Pressure Measurement and a Full-Scale Blasting Experiment in Hard Rock Quarry Mine Using Shock-Reactive Stemming Materials |
| title_full | Blast Hole Pressure Measurement and a Full-Scale Blasting Experiment in Hard Rock Quarry Mine Using Shock-Reactive Stemming Materials |
| title_fullStr | Blast Hole Pressure Measurement and a Full-Scale Blasting Experiment in Hard Rock Quarry Mine Using Shock-Reactive Stemming Materials |
| title_full_unstemmed | Blast Hole Pressure Measurement and a Full-Scale Blasting Experiment in Hard Rock Quarry Mine Using Shock-Reactive Stemming Materials |
| title_short | Blast Hole Pressure Measurement and a Full-Scale Blasting Experiment in Hard Rock Quarry Mine Using Shock-Reactive Stemming Materials |
| title_sort | blast hole pressure measurement and a full scale blasting experiment in hard rock quarry mine using shock reactive stemming materials |
| topic | blasting experiment stemming material shear thickening fluid sand blockage performance |
| url | https://www.mdpi.com/2076-3417/12/17/8629 |
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