Cone Penetrometer Testing

Hydro-Terra Group’s Cone Penetrometer Testing (CPT) is a low-disturbance subsurface investigation tool.

Cone Penetrometer Testing has been used extensively in Europe for over 50 years for hydrogeologic, environmental, and engineering investigations.  The test consists of pushing a 1.41-inch-diameter cone with a 55-degree conical tip through the underlying ground at a rate of 2 cm/sec with up to 20 tons of force. CPT soundings can characterize unconsolidated soils, alluvium, and rock.

Picture 003 copy-500pxHow CPT Works

Hydro-Terra Group’s CPT soundings use digital electronics to directly measure and log tip resistance, sleeve friction, inclination, and pore pressure and calculate tip/sleeve & pore pressure ratios, Std. Penetration Test (SPT) equivalent, and soils interpretation at 2 cm intervals (ASTM D-5778), supplemented by soil cores. On a maneuverable dual-wheel truck, our standard 4-ton CPT force sounds to 70 feet. For tougher jobs, on-board earth augers generate 20 tons.


 Cone Penetrometer TestingAdvantages of CPT

  • Fast, accurate, and generates no soil materials, no borehole stability concerns.
  • Real-time stratigraphic profiling of soils, hydraulic boundaries and conductivity.
  • Stand-alone or with borings & geophysics.
  • Geotechnical/foundation design and sinkhole investigation/remediation data.
  • In-situ laser-induced fluorescence (LIF) capability to identify hydrocarbons.
  • Data for 3-D modeling and visualization.
  • Stern-mount sounds near to structures.

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