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 s 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". Today, the CPT is one of the most used and accepted soil methods for soil investigation worldwide. The test method consists of pushing an instrumented cone, with the tip facing down, into the ground at a controlled rate controlled between 1. The early applications of CPT mainly determined the soil geotechnical property of bearing capacity.
Cone penetration tests
Cone Penetration Test
Cone Penetration Testing CPT is used to identify subsurface conditions in the upper ft of the subsurface. The weight of the truck is partially supported by both the tip of the cone and the sleeve of the cone. Soil type and thereby resistance to liquefaction can be inferred from these measurements. Data from the USGS cone , which includes a seismometer , can also be used to predict how local shallow soil conditions can modify shaking. The capacity of local soil conditions to modify shaking is inversely proportional to the shear-wave velocity near the surface, which can be computed with data recorded with the seismometer. Seismic energy is created manually with a sledgehammer or automatically by a compressed air driven hammer.
Cone penetration test
Cone penetration testing CPT provides a rapid, in situ, versatile and safe way to build up an understanding of ground properties. Our engineers pioneered ground testing methods using cone penetration testing in the s and have worked continuously to develop the technology into an internationally recognised capability across a diverse range of applications. Used as part of an integrated ground investigation, CPT provides a rapid and cost-effective means of quantifying the geotechnical and geoenvironmental properties of soils and of investigating UXO risk.