CMR Tech has manufactured a 72mm 20MPa Pressuremeter for use in stiff clays, sands and soft-medium rock.
Insertion Method – pre-bored hole
Initial diameter 72mm
Range 72-91mm
Length of material sacrificed – It works best 100mm up from the bottom of a 2m pocket. In this position the centre of the expanding region is 400mm from the bottom of the pocket.
Displacement System – direct strain sensing at 4 points equally spaced around the centre of the expanding region
Displacement resolution – better than 0.0001mm
Pressure resolution – better than 0.5kPa
Maximum working pressure – 20MPa