The influence of borehole arrangement of soundless cracking demolition agents (SCDAs) on weakening the hard rock
The hard roof difficult to collapse easily causes gas accumulation, which threatens the production safety of coal mine. Therefore, roof pre-cracking is required. Although blasting and hydraulic fracturing can also crack the roof, blasting can easily induce rock bursts, whereas hydraulic fracturing n...
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| Published in | International journal of mining science and technology Vol. 31; no. 2; pp. 197 - 207 |
|---|---|
| Main Authors | , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier B.V
01.03.2021
Elsevier |
| Subjects | |
| Online Access | Get full text |
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| Abstract | The hard roof difficult to collapse easily causes gas accumulation, which threatens the production safety of coal mine. Therefore, roof pre-cracking is required. Although blasting and hydraulic fracturing can also crack the roof, blasting can easily induce rock bursts, whereas hydraulic fracturing needs complex equipment. In contrast, soundless cracking demolition agents (SCDAs) with noise-free, dust-free, and safe characteristics have obvious advantages. The main component of SCDA is calcium oxide, which reacts with water to produce higher expansion pressure. In this paper, focused on the angles of the borehole, the effect of SCDA is analyzed by numerical simulation based on Pingdingshan coal mine. The research results showed that the azimuthal angle α (between borehole projection and the roadway direction) does not significantly affect the efficacy of SCDAs, whereas the influence of borehole elevation angle β is far more significant than that of the azimuthal angle. Therefore, the angle β is a dominant factor influencing the effect of SCDAs. Based on different effects of SCDAs at different angle of boreholes, the weakening unit was established, so the SCDAs could give full play to roof fracturing. Moreover, field tests validated the importance of borehole angle on weakening the hard roofs. |
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| AbstractList | The hard roof difficult to collapse easily causes gas accumulation, which threatens the production safety of coal mine. Therefore, roof pre-cracking is required. Although blasting and hydraulic fracturing can also crack the roof, blasting can easily induce rock bursts, whereas hydraulic fracturing needs complex equipment. In contrast, soundless cracking demolition agents (SCDAs) with noise-free, dust-free, and safe characteristics have obvious advantages. The main component of SCDA is calcium oxide, which reacts with water to produce higher expansion pressure. In this paper, focused on the angles of the borehole, the effect of SCDA is analyzed by numerical simulation based on Pingdingshan coal mine. The research results showed that the azimuthal angle α (between borehole projection and the roadway direction) does not significantly affect the efficacy of SCDAs, whereas the influence of borehole elevation angle β is far more significant than that of the azimuthal angle. Therefore, the angle β is a dominant factor influencing the effect of SCDAs. Based on different effects of SCDAs at different angle of boreholes, the weakening unit was established, so the SCDAs could give full play to roof fracturing. Moreover, field tests validated the importance of borehole angle on weakening the hard roofs. |
| Author | Cong, Yuzhou Tang, Wei Zhai, Cheng Xu, Jizhao Sun, Yong Zheng, Yangfeng |
| Author_xml | – sequence: 1 givenname: Wei surname: Tang fullname: Tang, Wei – sequence: 2 givenname: Cheng surname: Zhai fullname: Zhai, Cheng email: greatzc@cumt.edu.cn – sequence: 3 givenname: Jizhao surname: Xu fullname: Xu, Jizhao – sequence: 4 givenname: Yong surname: Sun fullname: Sun, Yong – sequence: 5 givenname: Yuzhou surname: Cong fullname: Cong, Yuzhou – sequence: 6 givenname: Yangfeng surname: Zheng fullname: Zheng, Yangfeng |
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| Keywords | Soundless cracking demolition agents Numerical simulation Borehole angle Coal mine Hard roof Weakening unit |
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