Cone penetration test a factor

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These soils may be expected to display different engineering characteristics given their different geological origins. The soils are mostly cohesive and the undrained shear strength, s u , is of geotechnical interest. The cone penetration test CPT allows an estimate of s u to be made via application of bearing capacity theory using a cone factor, N kt. Typically, N kt varies from 10 to 18, depending on the soil type, so it is often necessary to compare with a reference test to determine the N kt factor that is appropriate for the soil type on a site-specific basis.
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Typical values of the CPT cone factor, Nkt, in Auckland clays – New Zealand Geotechnical Society

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.
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One of the most frequently used methods to investigate this parameter is the cone penetration test CPT. The CPT does not measure the undrained shear strength directly, but instead the resistance that a conic probe encounters as it is pushed into the ground. A calibration factor, the cone factor Nkt , relating the two quantities is, therefore, needed. However, in Denmark, a value of 10 is recommended for similar soils. The magnitude of the calibration factor is critical when determining the undrained shear strength and, consequently, for further design.
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We were unable send the link to your email. Please check your email. During the penetration test the values of the cone resistance q c and the local skin friction f s , respectively are recorded. The cone resistance thus represents in general the resistance against penetration of a cone spike into the soil subsoil.
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