Fracture Distribution Characteristics in Goaf and Prevention and Control of Spontaneous Combustion of Remained Coal under the Influence of Gob-Side Entry Retaining Roadway

Based on the ventilation characteristics of gob-side entry retaining face, a mathematical model spontaneous combustion in face is established. From overburden caving goaf along roadway, development rock strata and residual coal fissures are summarized analyzed. In addition, by using numerical simulation software, effects normal mining period, roadway as return air leakage prevention, nitrogen injection measures studied, distribution flow field, oxygen concentration field temperature obtained. The results show that Geng 20 working has significant impact 19 seam. seam range fracture zone, well developed. Furthermore, permeability coefficient increases sharply, increased enlarged, which rise goaf. Therefore, proposed to inject 900 m3/h into goaf, can prevent left over according under hierarchical control, fire extinguishing technology system constructed.