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https://doi.org/10.17559/TV-20180805103717

An Experimental Study on the Interaction Law of the Pore Gas Pressure and Stress in Gassy Coals

Zuxiang Hu ; Key Laboratory of Mining Coal Safety and Efficiently Constructed by Anhui Province and Ministry of Education, Anhui University of Science and Technology, No.168 Taifeng Street, Huainan, Anhui Province, China, 232001
Jian Sun ; School of Civil, Mining and Environmental Engineering, Faculty of Engineering and Information Sciences, University of Wollongong, Wollongong, NSW 2522, Australia
Mingyun Tang ; Key Laboratory of Mining Coal Safety and Efficiently Constructed by Anhui Province and Ministry of Education, Anhui University of Science and Technology, No.168 Taifeng Street, Huainan, Anhui Province, China, 232001

Puni tekst: engleski, pdf (2 MB) str. 1154-1161 preuzimanja: 170* citiraj
APA 6th Edition
Hu, Z., Sun, J. i Tang, M. (2018). An Experimental Study on the Interaction Law of the Pore Gas Pressure and Stress in Gassy Coals. Tehnički vjesnik, 25 (4), 1154-1161. https://doi.org/10.17559/TV-20180805103717
MLA 8th Edition
Hu, Zuxiang, et al. "An Experimental Study on the Interaction Law of the Pore Gas Pressure and Stress in Gassy Coals." Tehnički vjesnik, vol. 25, br. 4, 2018, str. 1154-1161. https://doi.org/10.17559/TV-20180805103717. Citirano 14.11.2019.
Chicago 17th Edition
Hu, Zuxiang, Jian Sun i Mingyun Tang. "An Experimental Study on the Interaction Law of the Pore Gas Pressure and Stress in Gassy Coals." Tehnički vjesnik 25, br. 4 (2018): 1154-1161. https://doi.org/10.17559/TV-20180805103717
Harvard
Hu, Z., Sun, J., i Tang, M. (2018). 'An Experimental Study on the Interaction Law of the Pore Gas Pressure and Stress in Gassy Coals', Tehnički vjesnik, 25(4), str. 1154-1161. https://doi.org/10.17559/TV-20180805103717
Vancouver
Hu Z, Sun J, Tang M. An Experimental Study on the Interaction Law of the Pore Gas Pressure and Stress in Gassy Coals. Tehnički vjesnik [Internet]. 2018 [pristupljeno 14.11.2019.];25(4):1154-1161. https://doi.org/10.17559/TV-20180805103717
IEEE
Z. Hu, J. Sun i M. Tang, "An Experimental Study on the Interaction Law of the Pore Gas Pressure and Stress in Gassy Coals", Tehnički vjesnik, vol.25, br. 4, str. 1154-1161, 2018. [Online]. https://doi.org/10.17559/TV-20180805103717

Sažetak
Understanding the principle underlying the coupling between coal seam stress and gas pressure will help prevent the occurrence of dynamic coal and gas disasters. However, previous studies have mainly focused on the macroscopic qualitative analyses of the coupling between coal seam stress and gas pressure. In fact, laboratory quantitative tests, which investigate gas pressure in sealed sample tanks, fail to represent the essential relationship between stress and gas pressure in real time. In this study, a model of the stress–porosity–gas pressure relationship was established based on the pore characteristics of gassy coals and gas adsorption theory to quantify the coupling between coal seam stress and gas pressure. In addition, a method for determining the law governing stress and gas pressure coupling was proposed based on stress–strain curves obtained through triaxial loading tests. Results show that the porosity and gas pressure of gassy coals first decrease and then increase as loading stress increases. Under various confining pressures and initial gas pressures, porosity declines at a lower rate with the increase in the initial gas pressure. Specifically, gas pressure increases with stress before the value of stress reaches that of the compressive strength of the coal. This behaviour demonstrates that gas pressure and stress are positively correlated. High initial gas pressures are associated with small increments (i.e., from 136% to 30%) in pore gas pressure under stress. When stress exceeds the compressive strength of the coal, gas pressure begins to decrease with stress. Thus, stress and gas pressure are negatively correlated. Finally, the validity of the research method was verified through afield experiment. The proposed method provides new concepts for the study of the mechanism, prevention, and control technology of dynamic coal and gas disasters.

Ključne riječi
coupling effect; experimental study; gassy coals; pore gas pressure; stress

Hrčak ID: 204465

URI
https://hrcak.srce.hr/204465

Posjeta: 282 *