The paper presents an analysis of effectiveness of the application of seven commonly used CPT-Based classification systems for the assessment of subsoil stratigraphy and lithology. The analysis was conducted with the following classification systems: Begemann 1965, Douglas/Olsen 1981, modified Schmertmann 1985, Robertson et al. 1986, Robertson 1990, Eslami/Fellenius 1997, and, Zhang/Tumay 1999. The analysis was performed for subsoil composed of slightly and strongly overconsolidated moraine tills and glacifluvial sands and gravels. In the investigated area a total of nine piezocone penetration tests, PCPT (or CPTU) tests were conducted and samples were collected for laboratory analyses. The reference point for soil behavior type classification systems was provided by the results of grain size distribution of the soil. The basic element in the analysis was to determine the effect of the type of the applied soil behavior type classification system on the construction of the subsoil stiffness model. Three systems were selected as best performing for the purpose of this analysis: Douglas/Olsen 1981, Robertson et al.1986, and Zhang/Tumay 1999. The construction of subsoil stiffness models was based on the statistical Inverse Distance Weighted method (IDW) by Młynarek, et al., 2007.
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