CPT Static Testing

Penetrometric tests are carried out to obtain a continuous resistance profile of terrain and the consequent geotechnic characterisation of various units identified.
With CPT static testing (Cone Penetration Test), a conical point with a 60° opening is advanced at a constant speed through the ground: the column of shafts that enables the tip to move forwards is protected by a covering tubing with the same diameter as the tip. The tip, the pipe and both together are penetrated, respectively measuring tip resistance (Rp), lateral resistance (RI) and total resistance (Rt). Said resistance values are correlated with the mechanical characteristics of penetrated ground.
Moreover, CPTU also enables the measurement of neutral pressures present in terrains under investigation, with the use of a special electric tip fitted with a type of sensor (Piezocone).
This investigation method is especially suitable for fine grain material (cohesive and fine sand).