Imaging for foundation defects using GPR

During construction of an RCC structure over the reclaimed ground following collapse of old structure, severe difficulties to piling were encountered due to obstruction by debris of previously collapsed RCC structure buried in the foundation regime. Hence GPR profiling along series of lines were carried along several lines at the twin constructions sites. GPR survey revealed presence of RCC debris scattered at a depth of 7-8m along the line of pile foundations. By identifying these scatters, the most likely trouble free locations for piling were demarcated. This facilitated quick solution to foundation obstructions and the erection of new structure was completed without further complications.