Design of gas drainage modes based on gas emission rate in a gob: a simulation study

  • Xiaowei Li
  • Chaojie WangEmail author
  • Yujia Chen
  • Jun Tang
  • Yawei Li
Original Paper


In the process of working face advance in longwall coal mining, a great deal of gas relieved by the strata adjacent to the mining coal seam and the residual coal in gob migrates to gob. If the gas drainage method in gob is unreasonable, gas will accumulate in the upper corner and overrun in the return air flow. In the paper, a CFD (computational fluid mechanics) model of gob based on the actual geological conditions and gas drainage mode of 1262 working face of Dingji Coal Mine, China, was established. The gas drainage modes that should be taken to effectively control gas accumulation in the upper corner and gas overrun in the return air flow at different gas emission rates were discussed. The simulation results show that when the gas emission rate in the working face is lower than 20 m3/min, buried pipe drainage can effectively control gas accumulation in the upper corner and gas overrun in the return air flow. When gas emission rate there is between 20 and 30 m3/min, the two problems can be solved through cross-measure borehole drainage combined with buried pipe drainage. When gas emission rate there is higher than 40 m3/min, they can be effectively controlled through a three-dimensional drainage mode including buried pipes, cross-measure boreholes, and surface wells. Arranging surface wells within the fractured zone near the return airway can increase the gas drainage rate, and the gas concentration can reach over 85%; the gas concentrations of buried pipe drainage and cross-measure borehole drainage are 15~20% and 70~80%, respectively.


Surface well Fully mechanized face Gas disaster CFD Permeability Longwall mining 


Funding information

The study received financial support from the Fundamental Research Funds for the Natural Science Foundation of Jiangsu Province (BK20150195); the Natural Science Foundation of Jiangsu Province (BK20150180); the Natural Science Foundation of Jiangsu Province (BK20150181); and A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).


  1. Adhikary DP, Guo H (2015) Modelling of longwall mining-induced strata permeability change. Rock Mech Rock Eng 48:345–359CrossRefGoogle Scholar
  2. Cheng WM, Hu XM, Xie J, Zhao YY (2017) An intelligent gel designed to control the spontaneous combustion of coal: fire prevention and extinguishing properties. Fuel 210:826–835CrossRefGoogle Scholar
  3. Chu TX, Zhou SX, Xu YL, Zhao ZJ (2011) Research on the coupling effects between stereo gas extraction and coal spontaneous combustion. Procedia Eng 26:218–227CrossRefGoogle Scholar
  4. Ediz IG, Edwards JS (1991) Numerical simulation of time-dependent methane flow. Min Sci Technol 12:1–15CrossRefGoogle Scholar
  5. Guo H, Yuan L (2015) An integrated approach to study of strata behaviour and gas flow dynamics and its application. Int J Coal Sci Technol 2(1):12–21CrossRefGoogle Scholar
  6. Guo H, Yuan L, Shen B, Qu Q, Xue J (2012) Mining-induced strata stress changes, fractures and gas flow dynamics in multi-seam LW mining. Int J Rock Mech Min Sci 54:129–139CrossRefGoogle Scholar
  7. Guo H, Todhunter C, Qu Q, Qin Z (2015) Longwall horizontal gas drainage through goaf pressure control. Int J Coal Geol 150-151:276–286CrossRefGoogle Scholar
  8. Hu XC, Yang SQ, Zhou XH, Yu ZY, Hu CY (2015) Coal spontaneous combustion prediction in gob using chaos analysis on gas indicators from upper tunnel. J Nat Gas Sci Eng 26:461–469CrossRefGoogle Scholar
  9. Hu XC, Yang SQ, Liu WV, Zhou XH, Sun JW, Yu H (2017) A methane emission control strategy in the initial mining range at a spontaneous combustion-prone longwall face: a case study in coal 15, Shigang Mine, China. J Nat Gas Sci Eng 38:504–515CrossRefGoogle Scholar
  10. Hu ZX, Hu XM, Cheng WM, Lu W (2018) Influence of synthetic conditions on the performance of melamine–phenol–formaldehyde resin microcapsules. High Perform Polym.
  11. Jiang CL, Xu LH, Li XW, Tang J, Chen YJ, Tian SX, Liu HH (2015) Identification model and indicator of outburst-prone coal seams. Rock Mech Rock Eng 48:409–415CrossRefGoogle Scholar
  12. Karacan CÖ (2009) Reconciling longwall gob gas reservoirs and venthole production performances using multiple rate drawdown well test analysis. Int J Coal Geol 80:181–195CrossRefGoogle Scholar
  13. Karacan CÖ (2015) Analysis of gob gas venthole production performances for strata gas control in longwall mining. Int J Rock Mech Min Sci 79:9–18CrossRefGoogle Scholar
  14. Karacan CÖ, Esterhuizen GS, Schatzel SJ, Diamond WP (2007) Reservoir simulation based modeling for characterizing longwall methane emissions and gob venthole production. Int J Coal Geol 71:225–245CrossRefGoogle Scholar
  15. Karacan CÖ, Ruiz FA, Cotè M, Phipps S (2011) Coalmine methane: a review of capture and utilization practices with benefits to mining safety and to greenhouse gas reduction. Int J Coal Geol 86:121–156CrossRefGoogle Scholar
  16. Li XW, Jiang CL, Tang J, Chen YJ, Yang DD, Chen ZX (2017) A Fisher’s criterion-based linear discriminant analysis for predicting the critical values of coal and gas outbursts using the initial gas flow in a borehole. Math Probl Eng 2017:1–11. CrossRefGoogle Scholar
  17. Liang YT, Zhang J, Ren T, Wang ZW, Song SL (2018) Application of ventilation simulation to spontaneous combustion control in underground coal mine: a case study from Bulianta colliery. Int J Min Sci Technol 28:231–242CrossRefGoogle Scholar
  18. Mossad R, Vella A, Balusu R (2009) Inertisation of highwall mining to control methane concentrations at the Moura mine. Seventh International Conference on CFD in the Minerals and Process Industries. CSIRO, MelbourneGoogle Scholar
  19. Qu QD, Guo H, Loney M (2016) Analysis of longwall goaf gas drainage trials with surface directional boreholes. Int J Coal Geol 156:59–73CrossRefGoogle Scholar
  20. Ren TX (2009) CFD modelling of longwall goaf gas flow to improve gas capture and prevent goaf self-hearting. J Coal Sci Eng 15(3):225–228CrossRefGoogle Scholar
  21. Ren TX, Balusu R (2009) Proactive goaf inertisation for controlling longwall goaf heartings. Procedia Earth Planet Sci 1:309–315CrossRefGoogle Scholar
  22. Ren TX, Edwards JS (2000) Three-dimensional computational fluid dynamics modelling of methane flow through permeable strata around a longwall face. Trans Instn Min Metall (Sect A: Min Technol) 109(1):41–48Google Scholar
  23. Schatzel SJ, Karacan CÖ, Dougherty H, Goodman GVR (2012) An analysis of reservoir conditions and responses in longwall panel overburden during mining and its effect on gob gas well performance. Eng Geol 127:65–74CrossRefGoogle Scholar
  24. State Administration of Coal Mine Safety (2006) Basic index of coal mine gas drainage and exploition. AQ 1026–2006Google Scholar
  25. Tang J, Jiang CL, Chen YJ, Li XW, Wang GD, Yang DD (2015) Line prediction technology for forecasting coal and gas outbursts during coal roadway tunneling. J Nat Gas Sci Eng 34:412–418CrossRefGoogle Scholar
  26. Wang CJ, Yang SQ, Jiang CL, Yang DD, Zhang CJ, Li XW, Chen YJ, Tang J (2017) A method of rapid determination of gas pressure in a coal seam based on the advantages of gas spherical flow field. J Nat Gas Sci Eng 45:502–510CrossRefGoogle Scholar
  27. Xia TQ, Zhou FB, Gao F, Kang JH, Liu JS, Wang JG (2015) Simulation of coal self-heating process in underground methane-rich coal seams. Int J Coal Geol 2:1–12CrossRefGoogle Scholar
  28. Xu Q, Yang SQ, Wang C, Chu TX, Ma W, Huang J (2010) Numerical simulation of gas flow law in stope under stereo gas drainage. J Min Safety Eng 27(1):62–71Google Scholar
  29. Xue Y, Gao F, Gao YY, Liang X (2017) Research on mining-induced permeability evolution model of damaged coal in post-peak stage. J China Univ Min Technol 46(3):521–527Google Scholar
  30. Yan FZ, Lin BQ, Zhu CJ, Zhou Y, Liu X, Guo C, Zou QL (2016) Experimental investigation on anthracite coal fragmentation by high-voltage electrical pulses in the air condition: effect of breakdown voltage. Fuel 183:583–592CrossRefGoogle Scholar
  31. Yan FZ, Lin BQ, Xu J, Wang YH, Zhang XL, Peng SJ (2018) Structural evolution characteristics of middle−high rank coal samples subjected to high-voltage electrical pulse. Energy Fuel 32:3263–3271CrossRefGoogle Scholar
  32. Yang SQ, Hu XC, Liu WV, Cai JW, Zhou XH (2018) Spontaneous combustion influenced by surface methane drainage and its prediction by rescaled range analysis. Int J Min Sci Technol 28:215–221CrossRefGoogle Scholar
  33. Yu T (2014) Control mechanism and technology for integrated disaster of gas and coal spontaneous combustion in gob. University of Science and Technology of China, HefeiGoogle Scholar
  34. Yuan LM, Smith AC (2008) Numerical study on effects of coal properties on spontaneous heating in longwall goaf areas. Fuel 87:3409–3419CrossRefGoogle Scholar
  35. Yuan L, Zhang N, Kan JG, Wang Y (2018) The concept, model and reserve forcast of green coal resources in China. J China Univ Min Technol 47(1):1–8Google Scholar
  36. Zhang Q, Hu XM, Wu MY, Zhao YY, Yu C (2018) Effects of different catalysts on the structure and properties of polyurethane/water glass grouting materials. J Appl Polym Sci 135. CrossRefGoogle Scholar

Copyright information

© Saudi Society for Geosciences 2018

Authors and Affiliations

  • Xiaowei Li
    • 1
    • 2
  • Chaojie Wang
    • 1
    • 2
    Email author
  • Yujia Chen
    • 1
    • 2
  • Jun Tang
    • 1
    • 2
  • Yawei Li
    • 1
    • 2
  1. 1.Key Laboratory of Gas and Fire Control for Coal Mines, Ministry of EducationChina University of Mining and TechnologyXuzhouChina
  2. 2.School of Safety EngineeringChina University of Mining and TechnologyXuzhouChina

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