Abstract: The stability of underground mined-out area is generally affected by multiple factors. In addi-tion to the structure and stress of rock mass, there are also external factors such as mining method, fillingcondition of mined-out area, occurrence condition of rock mass and blasting vibration. All kinds of factorsare complicated and changeable and interfere with each other, which constitute the uncertainty of safetyspan of stope roof. Through the investigation, statistics and analysis of the current situation of the minegoaf, the research on the stability of the mine goaf is carried out, and the combination of theoretical cal-culation and numerical simulation analysis is adopted to evaluate the safety of the goaf, so as to providetechnical support for ensuring the safe production of the deep mine.

Key words: numerical simulation, goaf, underground mining, stope surrounding rock