Ground Penetrating Radar is an excellent non-destructive tooI for ground evaluations. These studies are done in pIaces where it is important to obtain information, for example, in areas where special constructions will be built or where a special use will be performed. Holes caused by flowing water, that erodes the ground materials or by their dissolution can damage the constructions performed there. The contrast between the electromagnetic parameters of the ground materials and the air or water ones, usually existing in these cavities, causes great reflections. Radar data, in areas where a cavity is placed, shows astrong reflection, which denotes the contact between .the ground and the filling material. Also, the bottom of the cavity is usually observed. So, the presence of multiple reflections is usual in these studies. The void size to be detected mainly depends of the materiaIs, the centre frequency and the bandwidth of the antenna and the speed of the antenna movement. To determine the GPR resolution it is necessary a full study of every case: equipment employed frequencies, distribution of the profiles and a preliminary geological study. Three different examples of voids are presented. The first is a great cavity caused by the dissolution of the salt. The second is the presence of small holes in the contact of different materiaIs, caused by the flowing water through the sand existing between conglomerate layers. Finally, the last is the erosion between the tunnel facing tile and the rock of the mountain where it is located. The observed radar images are discussed.


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