Energy-accumulated directional blasting technology and its application in gob-side entry retaining by roof cutting
Based on the principle of energy-accumulated directional blasting technology, the penetration condition of damage between blasting holes is established. The laws of blasting stress evolution, the development of directional cracks, and the directional blasting parameters are examined by the methods o...
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| Format: | Article |
| Language: | English |
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SAGE Publishing
2025-09-01
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| Series: | Energy Exploration & Exploitation |
| Online Access: | https://doi.org/10.1177/01445987251328143 |
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| author | Shangyuan Chen Tong Jiao Qian Lv Jinzhu Hu Zhenkang Wang |
| author_facet | Shangyuan Chen Tong Jiao Qian Lv Jinzhu Hu Zhenkang Wang |
| author_sort | Shangyuan Chen |
| collection | DOAJ |
| description | Based on the principle of energy-accumulated directional blasting technology, the penetration condition of damage between blasting holes is established. The laws of blasting stress evolution, the development of directional cracks, and the directional blasting parameters are examined by the methods of theoretical analysis, numerical simulation, and field testing. Based on the results of the Finite Element (FE) numerical simulation, a tensile stress of 91.2 MPa is generated on the blasting hole wall in the designated direction, which can fracture the rock mass to form directional cracks. With the action of the detonation stress, the length and width of directional damage in the rock mass increase continuously. The combined roof structure of “lower short-arm beam and upper masonry beam” is created after mining by the use of directional blasting to presplit the roof. The combined roof structure is more conducive for the stability of the retained entry. Taking the 21304 working face of Chengjiao coal mine as the engineering background, the directional blasting parameters are determined by doing theoretical analysis and conducting field tests, such as the blasting hole depth of 8 m, the blasting hole angle of 15°, the spacing between blasting holes of 500 mm, the single-hole charge structure of “4 + 3 + 2 + 0,” with the sealing length set at 2 m. When the determined blasting parameters were used to retain the entry, the roof in the goaf collapsed along the structural surface formed by directional blasting and the gangues filled the entire roadway quickly. Further, the surrounding rock of the retained entry was stable at about 290 m behind the working face, and a good retaining effect was obtained at the entry. The research results are significant for improving the technical system of gob-side entry retaining by roof cutting (GERRC), and provide guidance for the application of GERRC. |
| format | Article |
| id | doaj-art-b9a3775507d747d7a2ae58e0d9c83472 |
| institution | DOAJ |
| issn | 0144-5987 2048-4054 |
| language | English |
| publishDate | 2025-09-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Energy Exploration & Exploitation |
| spelling | doaj-art-b9a3775507d747d7a2ae58e0d9c834722025-08-20T02:50:53ZengSAGE PublishingEnergy Exploration & Exploitation0144-59872048-40542025-09-014310.1177/01445987251328143Energy-accumulated directional blasting technology and its application in gob-side entry retaining by roof cuttingShangyuan Chen0Tong Jiao1Qian Lv2Jinzhu Hu3Zhenkang Wang4 Jiaxing Key Laboratory of Active Photoelectric Detection Technology, Jiaxing, China Beijing Rockstar Petroleum Technology Co. Ltd, Beijing, China School of Civil and Transportation Engineering, , Anyang, China School of Civil Engineering, Shaoxing University, Shaoxing, China School of Civil and Transportation Engineering, , Anyang, ChinaBased on the principle of energy-accumulated directional blasting technology, the penetration condition of damage between blasting holes is established. The laws of blasting stress evolution, the development of directional cracks, and the directional blasting parameters are examined by the methods of theoretical analysis, numerical simulation, and field testing. Based on the results of the Finite Element (FE) numerical simulation, a tensile stress of 91.2 MPa is generated on the blasting hole wall in the designated direction, which can fracture the rock mass to form directional cracks. With the action of the detonation stress, the length and width of directional damage in the rock mass increase continuously. The combined roof structure of “lower short-arm beam and upper masonry beam” is created after mining by the use of directional blasting to presplit the roof. The combined roof structure is more conducive for the stability of the retained entry. Taking the 21304 working face of Chengjiao coal mine as the engineering background, the directional blasting parameters are determined by doing theoretical analysis and conducting field tests, such as the blasting hole depth of 8 m, the blasting hole angle of 15°, the spacing between blasting holes of 500 mm, the single-hole charge structure of “4 + 3 + 2 + 0,” with the sealing length set at 2 m. When the determined blasting parameters were used to retain the entry, the roof in the goaf collapsed along the structural surface formed by directional blasting and the gangues filled the entire roadway quickly. Further, the surrounding rock of the retained entry was stable at about 290 m behind the working face, and a good retaining effect was obtained at the entry. The research results are significant for improving the technical system of gob-side entry retaining by roof cutting (GERRC), and provide guidance for the application of GERRC.https://doi.org/10.1177/01445987251328143 |
| spellingShingle | Shangyuan Chen Tong Jiao Qian Lv Jinzhu Hu Zhenkang Wang Energy-accumulated directional blasting technology and its application in gob-side entry retaining by roof cutting Energy Exploration & Exploitation |
| title | Energy-accumulated directional blasting technology and its application in gob-side entry retaining by roof cutting |
| title_full | Energy-accumulated directional blasting technology and its application in gob-side entry retaining by roof cutting |
| title_fullStr | Energy-accumulated directional blasting technology and its application in gob-side entry retaining by roof cutting |
| title_full_unstemmed | Energy-accumulated directional blasting technology and its application in gob-side entry retaining by roof cutting |
| title_short | Energy-accumulated directional blasting technology and its application in gob-side entry retaining by roof cutting |
| title_sort | energy accumulated directional blasting technology and its application in gob side entry retaining by roof cutting |
| url | https://doi.org/10.1177/01445987251328143 |
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