The piezocone penetration test (CPTu) is a in situ testing method used to determine the geotechnical engineering properties of soils and assessing subsurface stratigraphy, relative density, strength and equilibrium groundwater pressures. The cone penetration or cone penetrometer test (CPT) is a method used to determine the geotechnical engineering properties of soils and delineating soil stratigraphy.It was initially developed in the 1950s at the Dutch Laboratory for Soil Mechanics in Delft to investigate soft soils. Based on this history it has also been called the "Dutch cone test".
The modern electric piezocone penetrometer (CPTu) sets the standard for geotechnical and geoenvironmental soil characterization. The most basic CPTu tool measures tip resistance, dynamic pore pressure, and sleeve friction continuously during penetration. D5778-12 Standard Test Method for Electronic Friction Cone and Piezocone Penetration Testing of Soils point resistance~ friction cone penetrometers~ piezocone .
ASTM D-5778 Standard Test Method for Performing Electronic Friction Cone and Piezocone Penetration Testing of Soils. Cones must be professionally calibrated annually. AMDRILL, Inc. carries out all Cone Penetration Tests (CPT) using an integrated electronic cone system, (see figure CPT below.). The piezocone test is performed by fitting a porous filter to the cone at one of three positions on the cone; the most common filter locations include the cone tip (u1) or the shoulder (u2), and the less common position is located behind the sleeve (u3).
Cone Penetration Test • CPT soundings can be very effective in site characterization, especially sites with discrete stratigraphic horizons or discontinuous lenses. • Toda, most of the commercially-available CPT rigs operate electronic friction cone and piezocone penetrometers, whose testing procedures are outlined in ASTM D-5778, adopted. Static penetration test (CPT) & piezocone (CPTu) CPT and CPTu static soundings are commonly used throughout the world and are applied to identify the subsoil under the construction objects. The test allows for direct exploitation of research results in designing of the direct or deep foundation.
May 16, 2017 · Geotechnical Testing in the 21st Century – PiezoCone Penetration Testing (CPT) The biggest risk for a development is the unknown, or poorly understood, subsurface conditions below the site. The type and number of geotechnical in-situ tests are the basis of minimizing risk (cost, schedule) for the proposed development. available in-situ testing methods are reviewed, with a primary emphasis on the seismic piezocone penetration test. It is believed that the implemen tation of enhanced in-situ testing can provide more accurate numbers for analysis, remove the relia nce on "judgment", and thus provide better economy.