Numerical simulation on the spontaneous combustion prevention in goaf of blasting coal caving face
LI Zong-xiang~1, ZHANG Chun~2, WANG Guo-jun~1, QIN Shu-yu~1 (1. College of Vocational, Liaoning Technical University, Fuxin 123000, Claina) (2. Yangcaogou Coal Mine, Changchun 130505, China) (3. Jilin Administration of Coal Mine Safety, Changchun 130505, China)
The unstable numerical model of spontaneous combustion in goaf is established, based on the seepage equation of leaking wind and the equation of gas seepage-diffusion-oxygen consumption. Supposing the goaf is homogenous, the consumption of oxygen is taken into account from the following aspects: the oxidizing of coal gangue and the outburst of methane. The model is resolved according to the simultaneous equation of numerical method finite element. The velocity of oxygen consumption, the out bursting intensity of methane and coefficient of permeability were obtained by fitting and inversing the on-site data from the Yang Cao-gou. The three girdles-cooling girdle, spontaneous combustion girdle, as phyxia girdle in goaf when blasting coal caving face was applied were pertained by definitive model, pointing out the spontaneous combustion place is where the unilateral entering wind in the heterogeneous goaf because of disequilibrium caving compaction. Furthermore, the quantizing relative between parameter of work face and spontaneous combustion was discussed, the paths and methods for the precaution of spontaneous combustion in goaf were given at the same time.
【CateGory Index】： TD752.2