CPTs, MAGNETOMETER AND CONE PRESSUREMETER TESTS IN SCOTLAND

Earlier this year, In Situ Site Investigation completed a large-scale infrastructure project in Northern Scotland using one of our tracked CPT rigs, CPT 006, ‘Zoe’.  We were asked to provide data for both the thickness and variability of the peat profile across the site, as well as a profile of the underlying geological strata. The tests provided geotechnical data in both the vertical and horizontal orientations, which was utilised by the client in their structural design for the project.

In order to obtain the required information for the ground investigation, a total of 186 in situ tests were completed using a selection of cone penetration tests (CPT) using a combined piezocone with magnetometer followed by cone pressuremeter testing. All tests pushed to a depth of up to 7.5m and the ground type was found to be peat over lying glacial till, typically comprising of medium dense to dense granular and medium to high strength cohesive material.

Due the remote location of this project and difficult terrain, some areas gave us a challenge with regards to access. However, we worked in close collaboration with the main contractor and other subcontractors throughout each stage to negotiate any issues and to ensure the safe and effective operation of the CPT works. Using one of our tracked CPT rigs, with support from a combination of low ground pressure excavator and track matting, we were able to reach all locations that required testing and complete the project within the required time frame.