In view of the problems of large amount of gas emission from adjacent strata and gas easily exceeding the limit in upper corner of Sijiazhuang coal mine, the goaf is divided into four zones based on the key stratum theory. Utilizing 3DEC numerical simulations, the collapse process of the overburden is analyzed from the perspective of the velocity field. This analysis facilitates the identification of key strata and the delineation of the “four zones” for depressurization gas extraction, along with monitoring displacements at various levels within the goaf, and examining the distribution characteristics of porosity to reveal the extent of fracture development areas in the goaf. Employing digital image processing technology, the characteristics of fracture distribution within the goaf are quantitatively analyzed. It is determined that the dominant rich accumulation areas for gas extraction in the fault zone extend from 25 m to 77 m within the boundary of the working face, at a height of 44 m to 63 m. The collapse zone is identified as the area from 3m to 44m inside the working face boundary, with heights ranging from 5.5 m to 25 m. Considering the geological features of the gas, the movement patterns of the overburden, and the requirements for gas drainage, optimal positioning for the layouts of high and low drainage roadways is proposed. After field application, effective gas management results were achieved through these high and low drainage techniques, with concentrations of gas in the upper corner remaining below 0.8 %. This approach can serve as a reference for gas management in outburst-prone mines with high gas emissions from adjacent layers.