Abstract: The foundation stability of old mine goaf is the key to reusing abandoned subsided land, and it needs quantities of measured data to analyze and evaluate. The traditional monitoring methods, highly precise as they are, cannot obtain historical and large-area data of subsidence. Aiming at this problem, this paper has taken the subsidence monitoring of a mine in Shaanxi province as a research subject, and the subsidence data of the mine has been obtained by processing and analyzing 19 TerraSAR images by using InSAR technology. The deformation rules of old goaf have been analyzed. Empirical formulas of subsidence velocity circulating peak and mining thickness, subsidence velocity cycle and ratio of mining depth to mining thickness and mining velocity, mining face cumulative subsidence and mining stopping halt have been established. These rules and empirical formulas can provide reference for prediction and evaluation of old goaf residual deformation.

Key words: old goaf, ground subsidence, InSAR