Avaliação Do Radar De Penetração No Solo (Gpr) Em Uma Investigação Do Subsolo

This paper presents a stratigraphy study carried out<br>with the Ground Penetrating Radar (GPR). This study<br>was made at the construction site of a building in the<br>campus of the Federal University of Rio de Janeiro.<br>The site was investigated by conventional percussion<br>borings (SPT - Standard Penetration Test), and the<br>two methods were evaluated for the capacity to detect<br>the interfaces between different layers, in particular<br>the soil-rock interface. In the GPR investigation three<br>antennae were used: 50, 100 and 200 MHz. The<br>penetration of the GPR method was restricted by the<br>presence of a fill layer, about 3m thick, and by the<br>possibility that the pore-water contains salt. The data<br>obtained with the various antennae, after processing,<br>revealed the most relevant ground features, the data<br>obtained with the 50 MHz antenna being specially<br>revealing with respect to the soil-rock interface.