CPTU tests

Using a piezocone (electric probe) has significantly improved the data obtained in static testing both in terms of measurement precision and data sampling frequency.
Pagani piezocones indeed allow the acquisition, during the continuous driving movement, of the qc (bit resistance) and fs (side friction) values at each centimetre of depth compared to the 20 centimetres which can be obtained with mechanical cone (Begemann).

The system also acquires the U value (hydrostatic pore pressure), the angle of the set of rods and the dissipation time (time measured between measurement of the overpressure obtained during the driving stage and the pressure measured when releasing the driving pressure).

TGAS-08

Electrical connections and components:

• TGAS-08 – The acquisition system.
• ENCODER – Measures the depth and speed of insertion.
• POWER SUPPLY – The system is powered electrically by the penetrometer battery, via a standard socket.
• ROD ADAPTER – Mechanically connects the piezocone to the thrust rods.
• GPS-GPRS ANTENNA – Allows the GPS coordinates to be acquired and sending of the tests via the GSM network.
• CPTU-ACQ SOFTWARE – Installed on a notebook, it allows tests to be imported from the TGAS08 system.

Piezocone specifications
Measurement channels:		Dimensions:
Tip resistance (qc):	50; 100 MPa	Cone apex angle:	60°
Sleeve friction (fs):	1,6 MPa (titanium)	Diameter:	36 mm
Pore pressure (U):	2,5 MPa	Section area:	10 cm²
Tilt:	0 – 20°	Friction sleeve surface:	150 cm²
Tip area factor (a):	0,80	Weight:	2,1 kg
Sleeve area factor (b):	0	Length:	413 mm

  

CPTU-ACQ Software

The TGAS08 system includes the CPTU-ACQ Software. Key functions:

• Real-time display of acquired and calculated data (Qc, Qt, Fs, Rf, U2, U2/Qc, Qc-U2, U2-U0, Speed, Tilt, Distance).
• Management of dissipation tests.
• Printing of all graphs, with customisation of print formats.
• Management of tests archive.
• Exporting tests as ASCII, EXCEL, PDF and DXF files.