Gas seepage equations of the coal seam under the action of moisture and the stress field
Abstract
A seepage experiment was conducted in relation to a loaded coal mass with various moisture content and workingconditions using self-developed tri-axial gas seepage equipment. A briquette sample was used as the researchobject. The change in the relationship of coal mass permeability under the combined action of moisture contentand effective stress was studied experimentally. The relational function was established between coal mass permeabilityunder this combined action and the seepage equation expressing gas migration in the coal seam. Theresearch showed the following: (1) the moisture content of coal heavily influences effective permeability, as coalmass permeability decreases in a quadratic polynomial relationship with the increase of effective stress at constantmoisture content; (2) at constant moisture content in the coal mass, coal mass permeability gradually declines ina negative exponent relationship with the increase of effective stress. Moreover, coal seam gas seepage equationsunder the combined action of moisture and stress field were put forward based on experimental results, the law ofmass conversation and Darcy’s law.References
[1] Ye Yuanxin, Liu Guangting, Research on coupling characteristics of fluid and stress within rock, Chinese Journal of Rock Mechanics and Engineering, 24(14) (2005)2518-2525.
[2] Zhao Yanlin, Cao Ping, Zhao Yangsheng,et al., Dual Media Model for Thermo-Hydro-Mechanical Coupling and 3D Numerical Simulation, Chinese Journal of Rock Mechanics and Engineering, 26(s2) (2007)4024-4031.
[3] Liu Baoxian, Xiong Deguo, Xian Xuefu, Adsorption and Seepage Characteristics of Coal to Methane under Electric Field, Journal of Chongqing University(Nature Science Edition), 29(2) (2006)83-85.
[4] Wang Hongtu, Du Yungui, Xian Xuefu, Seepage equation of coalbedgas in geophysical field, Chinese Journal of Rock Mechanics and Engineering, 21(5) (2002)644-646.
[5] Jiang Yongdong,Yang Xingyang, Xian Xuefu, The infiltration equation of coal bed under the cooperation of stress field, temperature field and sound field, Journal of China Coal Society, 35(3) (2010)434-438.
[6] Yin Guangzhi, Li Minghui, Li Wenpu, et al., Influence of gas pressure on mechanical and seepage characteristics of coal under unloading condition, Journal of China Coal Society, 37(9) (2012)1499-1504.
[7] Wang Dengke, Wei Jianping, Fu Qichao, et al., Coalbed gas seepage law and permeability calculation method based on Klinkenberg effect, Journal of China Coal Society, 39(10) (2014)2029-2036.
[8] Xiao Weimin, Xia Caichu, Wang Wei, et al., Study of a new equation for fluid flow through a single rough joint considering tortuosity effect, Chinese Journal of Rock Mechanics and Engineering, 30(12) (2011)2416-2425.
[9] Xiao Weimin, Xia Caichu, Wang Wei, et al., Analysis of fluid flow through rough joints based on a shear dilation model developed by Barton, Chinese Journal of Rock Mechanics and Engineering, 32(4) (2013)814-820.
[10] Coal Industry Ministry of the People′s Republic of China, Measuring methods of physico- mechanical properties for coal and rock, Beijing:Standards Press of China, (1988)32-33.
[11] ASTM, Standard test method for permeability of rocks by flowing air, USA:ASTM (1990)1-5.
[12] TERZAGHI K, Principles in soil mechanics, EngineeringNewsRecord, 95 (1925)832-836.
[13] Zhou Shining, Lin Boquan, The theory of gas flow and storage in coal seams, Beijing:China Coal Industry Publishing House, (1997)149-158.
[2] Zhao Yanlin, Cao Ping, Zhao Yangsheng,et al., Dual Media Model for Thermo-Hydro-Mechanical Coupling and 3D Numerical Simulation, Chinese Journal of Rock Mechanics and Engineering, 26(s2) (2007)4024-4031.
[3] Liu Baoxian, Xiong Deguo, Xian Xuefu, Adsorption and Seepage Characteristics of Coal to Methane under Electric Field, Journal of Chongqing University(Nature Science Edition), 29(2) (2006)83-85.
[4] Wang Hongtu, Du Yungui, Xian Xuefu, Seepage equation of coalbedgas in geophysical field, Chinese Journal of Rock Mechanics and Engineering, 21(5) (2002)644-646.
[5] Jiang Yongdong,Yang Xingyang, Xian Xuefu, The infiltration equation of coal bed under the cooperation of stress field, temperature field and sound field, Journal of China Coal Society, 35(3) (2010)434-438.
[6] Yin Guangzhi, Li Minghui, Li Wenpu, et al., Influence of gas pressure on mechanical and seepage characteristics of coal under unloading condition, Journal of China Coal Society, 37(9) (2012)1499-1504.
[7] Wang Dengke, Wei Jianping, Fu Qichao, et al., Coalbed gas seepage law and permeability calculation method based on Klinkenberg effect, Journal of China Coal Society, 39(10) (2014)2029-2036.
[8] Xiao Weimin, Xia Caichu, Wang Wei, et al., Study of a new equation for fluid flow through a single rough joint considering tortuosity effect, Chinese Journal of Rock Mechanics and Engineering, 30(12) (2011)2416-2425.
[9] Xiao Weimin, Xia Caichu, Wang Wei, et al., Analysis of fluid flow through rough joints based on a shear dilation model developed by Barton, Chinese Journal of Rock Mechanics and Engineering, 32(4) (2013)814-820.
[10] Coal Industry Ministry of the People′s Republic of China, Measuring methods of physico- mechanical properties for coal and rock, Beijing:Standards Press of China, (1988)32-33.
[11] ASTM, Standard test method for permeability of rocks by flowing air, USA:ASTM (1990)1-5.
[12] TERZAGHI K, Principles in soil mechanics, EngineeringNewsRecord, 95 (1925)832-836.
[13] Zhou Shining, Lin Boquan, The theory of gas flow and storage in coal seams, Beijing:China Coal Industry Publishing House, (1997)149-158.
Published
2015-12-30
How to Cite
LI, B. et al.
Gas seepage equations of the coal seam under the action of moisture and the stress field.
Journal of Power Technologies, [S.l.], v. 95, n. 4, p. 250--257, dec. 2015.
ISSN 2083-4195.
Available at: <https://papers.itc.pw.edu.pl/index.php/JPT/article/view/721>. Date accessed: 18 apr. 2024.
Issue
Section
Energy Engineering and Technology
Keywords
The rate of moisture content; Effective stress; Permeability; Gas seepage equation
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
