Geophysical survey can be used to detect foreign objects in the ground, for example in infrastuctural and archaeological projects or landfill investigations. Foreign objects in the subsurface can usually be detected because they have different properties than the surrounding material.
Borehole research takes place if geophysical research from ground level is not possible. T&A performs measurements with logging equipment and maps the properties of the borehole and its immediate surroundings.
T&A performs geotechnical research, depth detection, the determination of the length of sheet piling or the location of anchor rods using a magnetometer cone. A CPT (Cone Penetration Test) rod with a built-in magnetometer is pressed into the ground in a controlled manner using a CPT truck or CPT platform.
Application in geological and hydrological investigation
Geophysical survey techniques make it possible to map the geological structure of the subsurface to a depth of several kilometres. A continuous image of the underground is created without having to do numerous deep drillings or probings.
There are various techniques for mapping the subsurface or constructions. Based on our knowledge and practical experience we determine which technique will be most succesful for each investigation. Important factors to take into consideration are for example depth, specific circumstances, precision, measurement speed and costs.