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A full-wavefield imaging detection method is developed and then applied to reveal the defects in the highway embankment. This testing system integrates the pointsource/point-receiver scheme with the multi-directional imaging technique to achieve the effect like scanning. It is equipped with an impacting hammer, a series of three-component velocity transducers and a signal capturing unit. To evaluate the feasibility of this system for detecting defect of highway embankment, a full-scaled highway embankment model test with pre-setting defection is conducted. And a 3-D numerical simulation using FEM are performed for comparison and mechanism study. It is paid special attention on the propagation characteristics of full wave field in the model. The characteristics of spectral characteristics derived from Fourier transform are analyzed. Experimental results show agreement with the numerical ones on the processed scanning images. It is concluded that the full-wavefield imaging detection method exhibits high potential in inspecting the defects of highway embankment by imaging.

Full wavefield imaging detection method and its application on defect investigation of highway embankment