Blackie cone penetration testing

Cone penetration tests allow an assessment of the strength of soils to be estimated using in-situ measurements over a continuous depth in all soil types, avoiding issues related to recovery, disturbance and in-situ conditions that are often associated with sampling and laboratory testing. It is accepted that in Clay materials, tip resistance can be related to undrained shear strength using a correlation factor — N k. Correct selection of the site specific correlation factors N k is critical for accurate calculation of the strength of clays, particularly for sensitive or interbedded soils. This paper uses a large data set from different site investigations to demonstrate how various methods can be used to improve the site specific calculation of correlation factors N k for a given stratum.

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. The original cone penetrometers involved simple mechanical measurements of the total penetration resistance to pushing a tool with a conical tip into the soil.

This study presents the results of Cone Penetration Tests CPT and estimated correlations with the results of other in-situ tests standard penetration test, cross-hole, seismocone and laboratory tests classification and undrained shear strength tests. These tests cover nearly all types of penetrable soils in Greece and, together with the formulation of empirical correlations, complement and improve on previous studies due to the significant number of CPT measurements. Unable to display preview. Download preview PDF. Skip to main content.

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