Deformation of ground surface above old mine goaf is a complex nonlinear process

which has complex

sudden

and long-term features. The foundation stability and residual deformation must be evaluated before building life or service facilities above old mine goaf. A new method is put forward for stability analysis and evaluation of buildings above goaf by multiscale decomposition using empirical mode decomposition(EMD) method. Trough case study

detail signals of dynamic deformation of buildings above old mine goaf are obtained using multiscale empirical mode decomposition method. Decomposition scales are analyzed so as to evaluate the deformation characteristics reflected by original data and research the deformation mechanism effectively. Precision prediction for deformation is obtained by multiscale prediction model which is better than traditional method. This prediction model can provide a theoretical basis for stability evaluation of buildings above old mine goaf.