Geotechnical probesThe static penetration test (Cone Penetration Test) consists of pushing a cone penetrometer into the ground vertically at a constant rate of 2 cm/sec.

During the course of the penetration, the point resistance (qc), and the friction (fs) on a sleeve located above the tip, are measured separately. The CPTU test (piezocone) allows the additional measurement of excess pore pressure generated during the penetration. The reaction necessary for penetration is provided by the weight of the vehicle or by anchorage to the ground.

The readings of these parameters are produced and visualised in real time on site, at 1cm intervals, by which means a detailed profile of the soil is obtained.

 

Advantages and applications

  • Determination of the stratigraphic profile and classification of the soil, allowing the detection of thin layers with a far greater precision than conventional surveys.
  • Differentiation between drained, partially drained and undrained soil.
  • Estimation of geotechnical parameters.
  • Direct calculations methods.