Void identification of jointed slab on elastic foundation by acoustic vibration

Relationship between jointed slab and void of elastic foundation and acoustic features of resonator is studied by acoustic vibration. The vibration frequencies of jointed slab with or without void are calculated and analyzed by finite element method (FEM). The range and size of void, detected by acoustic vibration, prove to be closely associated with the acoustics features. Taking a void pavement slab as the example, by calculating and analyzing, an integrated neural network based on information fusion can be applied to identify the void of rigid pavement slab. Thus it offers theoretical and experiment basis for NDT of the defect like foundation void by means of acoustic features. The method proves to work rapidly, precisely and conveniently in practical application.