3D GPR Measurements for Fractures Detection in Selected Post-mining Regions in Poland

The paper presents the results of 3D GPR measurements carried out over shallowly located drifts. The aim of georadar investigations was to analyse the influence of mining activity on the rock-mass. Geophysical measurements were conducted in two sites with different geological conditions, i.e. over the drift made in gneiss and over the excavations made in sandstone. All excavations were located shallowly, surrounding geological media had low attenuation and reflection coefficients on the boundaries between hosting media and the voids (drifts) were high. Despite of mentioned facts there were recorded no reflections from the roofs of drifts. This interesting effect was additionally analysed in the paper.