Experimental study on radon exhalation characteristics of coal samples under varying gas pressures
Coal and gas outburst during underground mining operations negatively affects the mining safety and decrease the mining productivity. Current outburst prediction has been largely relying on seismic monitoring which is passive and extremely difficult to quantify. As coal produces radon in the damage...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2018-09-01
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| Series: | Results in Physics |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211379718312191 |
| _version_ | 1818213688315740160 |
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| author | Jianping Wei Pengfei Cui Zhongwei Chen Banghua Yao Chunshan Zheng Bing Jia Xiaochuan Wang |
| author_facet | Jianping Wei Pengfei Cui Zhongwei Chen Banghua Yao Chunshan Zheng Bing Jia Xiaochuan Wang |
| author_sort | Jianping Wei |
| collection | DOAJ |
| description | Coal and gas outburst during underground mining operations negatively affects the mining safety and decrease the mining productivity. Current outburst prediction has been largely relying on seismic monitoring which is passive and extremely difficult to quantify. As coal produces radon in the damage process, this unique feature potentially offer a new way to reliably predict the outburst incidents. Therefore, in this study, a series of experiments were carried out under different gas pressures adopting the new coal-rock triaxial-loading radon exhalation test system, which aim to investigate the effect of gas depletion pressures on the characteristics of radon exhalation. The data of stress-strain, radon concentration, and acoustic emission were monitored simultaneously in the dynamic loading processes, and were compared and discussed in detail. Experimental results show that in the loading process, radon concentration shows clear step changes and has good consistency with the results of the coal deformation stages according to the acoustic emission count, verifying the feasibility of coal deformation and fracturing prediction based on radon concentration. Meanwhile, at the early stage of loading, the peak value of radon concentration reduces gradually with the increase in gas pressure. Furthermore, relationship between the maximum value of radon concentration and gas pressure is obtained. This work presents a new method to link gas pressure, coal deformation and fracture prediction together based on radon concentration, which could provide significant guidance for the accurate prediction of coal and rock dynamic disasters. Keywords: Radon exhalation, Coal damage, Acoustic emission counts, Radon concentration, Gas pressure |
| first_indexed | 2024-12-12T06:08:16Z |
| format | Article |
| id | doaj.art-8329d4b7000b402da9edd78bab1dcc3c |
| institution | Directory Open Access Journal |
| issn | 2211-3797 |
| language | English |
| last_indexed | 2024-12-12T06:08:16Z |
| publishDate | 2018-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Physics |
| spelling | doaj.art-8329d4b7000b402da9edd78bab1dcc3c2022-12-22T00:35:14ZengElsevierResults in Physics2211-37972018-09-011010061014Experimental study on radon exhalation characteristics of coal samples under varying gas pressuresJianping Wei0Pengfei Cui1Zhongwei Chen2Banghua Yao3Chunshan Zheng4Bing Jia5Xiaochuan Wang6School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, China; Collaborative Innovation Center of Coal Work Safety, Henan Province, Jiaozuo 454000, ChinaSchool of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, ChinaState Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Shandong 266590, China; School of Mechanical and Mining Engineering, The University of Queensland, QLD 4072, Australia; Corresponding author at: School of Mechanical and Mining Engineering, The University of Queensland, QLD 4072, Australia.School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, China; State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Shandong 266590, China; Collaborative Innovation Center of Coal Work Safety, Henan Province, Jiaozuo 454000, ChinaSchool of Mechanical and Mining Engineering, The University of Queensland, QLD 4072, Australia; School of Mining and Safety Engineering, Anhui University of Science & Technology, Huainan, Anhui 232001, ChinaSchool of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, ChinaSchool of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, ChinaCoal and gas outburst during underground mining operations negatively affects the mining safety and decrease the mining productivity. Current outburst prediction has been largely relying on seismic monitoring which is passive and extremely difficult to quantify. As coal produces radon in the damage process, this unique feature potentially offer a new way to reliably predict the outburst incidents. Therefore, in this study, a series of experiments were carried out under different gas pressures adopting the new coal-rock triaxial-loading radon exhalation test system, which aim to investigate the effect of gas depletion pressures on the characteristics of radon exhalation. The data of stress-strain, radon concentration, and acoustic emission were monitored simultaneously in the dynamic loading processes, and were compared and discussed in detail. Experimental results show that in the loading process, radon concentration shows clear step changes and has good consistency with the results of the coal deformation stages according to the acoustic emission count, verifying the feasibility of coal deformation and fracturing prediction based on radon concentration. Meanwhile, at the early stage of loading, the peak value of radon concentration reduces gradually with the increase in gas pressure. Furthermore, relationship between the maximum value of radon concentration and gas pressure is obtained. This work presents a new method to link gas pressure, coal deformation and fracture prediction together based on radon concentration, which could provide significant guidance for the accurate prediction of coal and rock dynamic disasters. Keywords: Radon exhalation, Coal damage, Acoustic emission counts, Radon concentration, Gas pressurehttp://www.sciencedirect.com/science/article/pii/S2211379718312191 |
| spellingShingle | Jianping Wei Pengfei Cui Zhongwei Chen Banghua Yao Chunshan Zheng Bing Jia Xiaochuan Wang Experimental study on radon exhalation characteristics of coal samples under varying gas pressures Results in Physics |
| title | Experimental study on radon exhalation characteristics of coal samples under varying gas pressures |
| title_full | Experimental study on radon exhalation characteristics of coal samples under varying gas pressures |
| title_fullStr | Experimental study on radon exhalation characteristics of coal samples under varying gas pressures |
| title_full_unstemmed | Experimental study on radon exhalation characteristics of coal samples under varying gas pressures |
| title_short | Experimental study on radon exhalation characteristics of coal samples under varying gas pressures |
| title_sort | experimental study on radon exhalation characteristics of coal samples under varying gas pressures |
| url | http://www.sciencedirect.com/science/article/pii/S2211379718312191 |
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