Search

A027 Monitoring of water infiltration using GPR data Summary A Ground Penetrating Radar survey was carried out for water infiltration monitoring and mapping of shallow subsurface conditions. A first measurement allowed high resolution mapping of subsurface conditions and assessment in variations of the GPR reflection response for saline water infiltration in the upper few metres of unsaturated soil. In total three sites with representative lithologies of the Paris Basin were investigated to compare hydrologic behaviour in different types of soil. This paper shows results from both synthetic modelling as well as from measurements carried out over sands nearby Rambouillet. Further

P051 3-D INTERPRETATION AND CEMENT FILL MONITORING USING GPR OVER AN ABANDONED GYPSUM MINE Summary A Ground Penetrating Radar survey was carried out for cavity mapping and monitoring of the shallow subsurface conditions. The survey is located on a building site at the flank of the Mont- Valerien (larger western Paris suburb France) where an indoor tennis hall is under construction. Ancient gypsum mine galleries at 10-30 metres depth are a safety hazard in the shallow subsurface. Ground stabilisation is achieved by injecting cement in the cavities. Problem is to predict the outline of the cavities as grid drilling is