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Ground

Cavities and voids

Detection of subsurface features including man-made targets such as wells, storage tanks and cellars, and deeper features such as caves, mineworkings including shafts and adits. Also investigation of natural cavities such as caves, fissures and solution features.

Ground Resistivity profile from a survey to detect hidden shafts below a railway. A 6m diameter capped shaft was located centred on a chainage 36m
Ground Resistiviy profile

Typical applications include preparing sites for development and construction activity and ensuring their suitability for heavy loading such as those imposed by cranes and other heavy plant. Geophysics is widely used in identifying hazards such as solution features below new and existing highways rail and pipeline routes.

Blackheath cavity A2 Blackheath, London – ground collapse associated with ancient mining. As part of an integrated investigation package geophysics can help identify problems before they reach the surface.