Abstract: The paper analyses the factors of Xiaowangzhuang underground iron mining that influence the stability of Daqin Railway subgrade and establishes a FLAC numerical simulation model suitable for mining project simulation. Through the numerical simulation analysis, the values of the stress change around the railway are calculated. The simulation results indicate that the displacement around Daqing railway induced by Xiaowangzhuang underground iron mining is at the order of magnitude of 10-4, almost no impact at all., which is of great reference significance to the mine construction and normal production.

Key words: Stability, FLAC, Numerical simulation