Study on reasonable arrangement of upper level drainage-way anddetermination of final roadway position in high gassy mine

In order to control the upper corner gas overlimit of Shoushan No.1 Mine,upper level drainage-way was adopted to extract gas from the goaf, according to the distribution characteristics of inclined overburden fractures, rational layout of upper level drainage-way a reasonable horizontal distance and tailentry has carried on the theoretical calculation,on the basis of fully-mechanized working face in the early mining stage pressure characteristics, to build a new model of rock fracture development, calculate the reasonable final lane position for upper level drainage-way. The results showed that the location of upper level drainage-way has an important influence on gas drainage in goaf, it is determined that rational layout position of upper level drainage-way in No.1 Shoushan Coal Mine is drainage 16～20 m (medium to medium) offset in the tailentry, keep the vertical distance of 20～25 m with the return airway; the optimal position of the terminal line is 80 m horizontal distance from the open-off cut.