Investigation of a non-explosive directional roof cutting technology for self-formed roadway
Traditional explosives have characteristics of high risk, large vibration, and poor directional fracturing. Consequently, an instantaneous expander with a single crack surface (IESCS), which is a novel non-explosive directional rock-breaking technique, has been developed. The directional roof-cuttin...
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| Published in | International journal of mining science and technology Vol. 32; no. 5; pp. 997 - 1008 |
|---|---|
| Main Authors | , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier B.V
01.09.2022
Elsevier |
| Subjects | |
| Online Access | Get full text |
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| Abstract | Traditional explosives have characteristics of high risk, large vibration, and poor directional fracturing. Consequently, an instantaneous expander with a single crack surface (IESCS), which is a novel non-explosive directional rock-breaking technique, has been developed. The directional roof-cutting mechanism of the IESCS method, driven by high-pressure gas, was theoretically analyzed. Laboratory experiments and numerical simulations proved the directional slitting effect of the IESCS method to be excellent. Compared with shaped-charge blasting, the charge of IESCS was reduced by 8.9%, but the crack rate increased by 9% in field tests. After IESCS pre-splitting, the roof directionally collapsed along the cutting line, and the gangue filled the goaf. Moreover, the directional roof cutting by the IESCS could decrease roadway stress. The average pressure of hydraulic supports on the cutting side of the roof was 31% lower than that on the non-cutting side of the roof after pre-splitting. After the self-formed roadway constructed by the IESCS was stabilized, the final relative displacement of the roof and floor was 157.3 mm, meeting the required standard of the next working face. Thus, the IESCS was effectively applied to directional roof pre-splitting. The results demonstrate the promising potential of IESCS in the mining and geotechnical fields. |
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| AbstractList | Traditional explosives have characteristics of high risk, large vibration, and poor directional fracturing. Consequently, an instantaneous expander with a single crack surface (IESCS), which is a novel non-explosive directional rock-breaking technique, has been developed. The directional roof-cutting mechanism of the IESCS method, driven by high-pressure gas, was theoretically analyzed. Laboratory experiments and numerical simulations proved the directional slitting effect of the IESCS method to be excellent. Compared with shaped-charge blasting, the charge of IESCS was reduced by 8.9%, but the crack rate increased by 9% in field tests. After IESCS pre-splitting, the roof directionally collapsed along the cutting line, and the gangue filled the goaf. Moreover, the directional roof cutting by the IESCS could decrease roadway stress. The average pressure of hydraulic supports on the cutting side of the roof was 31% lower than that on the non-cutting side of the roof after pre-splitting. After the self-formed roadway constructed by the IESCS was stabilized, the final relative displacement of the roof and floor was 157.3 mm, meeting the required standard of the next working face. Thus, the IESCS was effectively applied to directional roof pre-splitting. The results demonstrate the promising potential of IESCS in the mining and geotechnical fields. |
| Author | Guo, Shan Zhu, Chun Wang, Chao He, Manchao Tao, Zhigang Wang, Jiong Zhang, Quan |
| Author_xml | – sequence: 1 givenname: Quan surname: Zhang fullname: Zhang, Quan organization: School of Mines, China University of Mining and Technology, Xuzhou 221116, China – sequence: 2 givenname: Manchao surname: He fullname: He, Manchao organization: School of Mines, China University of Mining and Technology, Xuzhou 221116, China – sequence: 3 givenname: Jiong surname: Wang fullname: Wang, Jiong email: wangjiong0216@163.com organization: State Key Laboratory of Geomechanics & Deep Underground Engineering, China University of Mining and Technology - Beijing, Beijing 100083, China – sequence: 4 givenname: Shan surname: Guo fullname: Guo, Shan organization: State Key Laboratory of Geomechanics & Deep Underground Engineering, China University of Mining and Technology - Beijing, Beijing 100083, China – sequence: 5 givenname: Chun surname: Zhu fullname: Zhu, Chun organization: School of Earth Sciences and Engineering, Hohai University, Nanjing 210098, China – sequence: 6 givenname: Zhigang surname: Tao fullname: Tao, Zhigang organization: State Key Laboratory of Geomechanics & Deep Underground Engineering, China University of Mining and Technology - Beijing, Beijing 100083, China – sequence: 7 givenname: Chao surname: Wang fullname: Wang, Chao organization: State Key Laboratory of Geomechanics & Deep Underground Engineering, China University of Mining and Technology - Beijing, Beijing 100083, China |
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| Keywords | Non-explosive Self-formed roadways Directional roof cutting Pillarless mining Instantaneous expander with a single crack surface |
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| Title | Investigation of a non-explosive directional roof cutting technology for self-formed roadway |
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