At present cone penetration test is considered to be a well-established method in geotechnical analyses to the point when it is frequently seen as a leading method. Sometimes its results are overestimated due to the status of this method, particularly when soil strength is evaluated solely on the basis of CPT results. At full drainage and a load-bearing subsoil this problem is not significant, but it gains in importance when recorded excess pore water pressure is not included in the evaluation of soil strength under partial drainage or no drainage. The matter of selecting a reliable interpretation procedure constitutes a key element in the proper analysis of cone penetration test results. The paper presents limitations and criteria differentiating the selection of an interpretation procedure for the evaluation of shear strength parameters and a comparison of strength analyses results of soils depending on the type of applied CPT and CPTU.

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