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《Journal of China University of Mining & Technology》 1993-01
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The Theoretical Calculation and Observation Analysis of the "three Zones "in the Goaf of Fully Mechanized Face with Top Coal Drawing

Di Zhiqian Ding Guangxiang Zhue Shuxun ( Department of Coal Mining Engineering ) Liu Runshen Zhao Changchun ( Yangquan Coal Mine Administration )  
Applying the theory of nonlinear infiltration this paper has established the flow function equation of the nonlinear infiltration for two dimension plane goaf. The flow function value at each joint and the flow velocity vx, vy, v in each element have been evaluated by finite element, and the air flow line and isolach in the goaf can thus be obtained. According to the upper and lower limits of the air velocity corresponding to coal spontaneous combustion, the state and extent of the nonspontaneous combustion zone, the possible spontaneous combustion zone and the suffocative zone in the goaf of the fully mecha-nized face with top coal drawing have been determinated. The observation analysis of pressure manifestation, temperature variation and concentration variation of oxygen in the goaf show that the results of theoretical calculation is consistent with that of practice.
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