CPTu tests (Cone Penetration Test with Pore Pressure measurement) are in situ geotechnical investigations that use a penetrometer to insert the piezocone into the ground. During execution, the tip resistance (Qc), lateral friction (Fs), and, crucially, the pore water pressure (U) in the soil pores are continuously measured. This data allows for precise information regarding the stratigraphy, classification, and consolidation properties of soils, with particular reference to soft and saturated soils.
The use of (electric tip) has resulted in a significant improvement in the data collected during static tests, both in terms of measurement accuracy and sampling frequency.
Thanks to the Pagani piezocone, it is possible to acquire, during continuous pushing, the Qc (tip resistance) and Fs (lateral friction) values at every centimeter of depth, compared to the 20 centimeters achievable with the Begemann-type mechanical tip.
The system also acquires the values of u (hydrostatic pressure in the pores), Tilt (inclination angle of the rod battery), and dissipation time (the time interval measured between the detection of overpressure during the pushing phase and the pressure recorded during the release phase).