GPR Surveys

GPR offers one of the most versatile non-destructive ground investigation techniques currently available and can be applied successfully to a variety of problems where information on the properties of the ground is required. Pulse Surveying carry a range of different GPR Antennae and equipment for a wide range of scenarios from deep ground investigations to detailed shallow investigations and can tailor surveys to meet specific requirements.

Pulse Surveying predominantly use GPR for pavement investigations on roads and airfields ranging from detailed ‘slow-speed’ surveys undertaken at walking speed to network level road surveys conducted at traffic speed. Information gathered from these surveys include determination of layer depths, detection of construction changes, location of overlaid joints, identification of voids and wet patches (possible indications of poor support), location of steelwork/reinforcement bars and location of excess sub-base moisture (indicating poor drainage).

For most surveys the GPR antennas are towed along the ground either behind a vehicle in a purpose-built sledge or from a survey cart. Working this way allows the GPR data to be displayed in real time on a laptop during the survey so that the technicians can provide information about the presence of discrete objects such as buried pipes, material layers (e.g. soils, rock), and any changes in construction.

Following the survey, data can be supplied in either raw format (DZT format) or as analysed data in the form of asci files. Where reports are required the raw data files are returned to the Derby office for data processing and analysis to the clients specification to provide accurate information on layer depths, material types, feature identification and the locations of any voiding or moisture ingress. Reports can then be issued in a variety of formats (Excel, CAD etc) ranging from summary charts showing layer depths and material features to detailed interpretative reports.