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The characteristic feature of the geological structure in the Lublin Region is loess covers, which at the same time constitutethe main subsoil for setting building structures. Geological structure is the basis for developing a geotechnical model of thesubsoil, which may be identical to the geological model. However, these two types of models in many cases should differ,because the geotechnical model is developed depending on the type of structure, its dimensions, the method and depth ofthe foundation, and the loads transferred. Identifying geological layers only on the basis of lithology and subsoil state leadsto significant and excessive simplification, especially when these layers occur at different depths. Soil stiffness and its bear-ing capacity depend not only on the state, i.e. wetness but also on several other factors which are difficult to identify basedon a superficial macroscopic assessment, even with the verification of individual samples with laboratory tests. A good foun-dation for the geotechnical assessment of the subsoil is provided by in situ tests such as CPTU and DMT, which allow for astatistical evaluation of parameters. The work presents the methodology for creating a geotechnical model of the loess sub-soil based on in situ tests
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