ABSTRACT
This case history describes how the planned construction of an additional track on a railway required geophysical investigation as an initial survey of the ground conditions. It was essential to depict the upper 20 m with detailed information about the depth to a solid moraine layer or to the bedrock, the extent of soft soil (especially peat), and the detection of weak zones in the rock. The chosen methods were seismic refraction, electrical resistivity tomography (ERT), and ground penetrating radar (GPR). The case includes practical survey and planning considerations along with examples of interpretations and results.
