The present work deals with the application of applied geophysical methods to voids by two different approaches. The one refers to the detection of the voids and the second to monitor the consolidation of the ground. Three different methods are tested in both these two phases, resistivity, ground penetrating radar and seismic refraction. Initial geophysical survey was based mainly on resistivity and GPR methods, which allowed the detection of possible voids who were drilled after the suggestion of the geophysical results. All voids verified by the drilling were filled by a mix of soil and cement. Just before the start of the filling procedure, ERT, GPR and seismic data have been produced and measurements repeated again after the end of it, in order to verify the complete filling of the voids.

The response of the geophysical data was very clear since all geophysical features indicating the existence of the voids, vanished and showed the success of the consolidation process


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