Purpose. Finite elements method (FEM) spatial tasks decisions using elastic-plastic soil models show the possibility of correct soil compaction modeling, but unresolved is the item of testing these solutions for clay soils compaction process modeling being a part of highway embankment by the condition of their long-term strength ensuring, which was the aim of the work. Methodology. To simulate the process of layered clay soils compaction being a part of highway embankment, it is used well

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... software package «PRIZ-Pile», which implemented the FEMstepping iterative methods axisymmetrical task of physically and geometrically nonlinear statement with representation of soil isotropic or orthotropic environment. Findings. As a result of numerical simulation three-factors analysis of the impact on the skeleton density average value in the compacted soil initial clay soil skeleton density within the layer after its dumping and leveling, initial thickness of filled and planned to horizontal level subgrade by grader or bulldozer layer, reduction of each clay soil layer surface under the smooth roller was performed. With high statistical indicators values the empirical equation of the relationship between clay soil skeleton density in each compacted layer and above mentioned parameters is obtained. Originality. New correct conditions of FEM modeling in physically and geometrically nonlinear statement the process of layered clay soils compaction being a part of highway embankment, resulting a designer receives soil skeleton density and its deformation module in each layer are established. Practical value. The optimum silty loam moisture for their layered compaction depending on the project soil skeleton density value within the embankment and plasticity number is determined. 1* Кафедра «Автомобильных дорог, геодезии, землеустройства и сельских зданий», Полтавский национальный технический университет имени Юрия Кондратюка, проспект Первомайский, 24, Полтава, Украина, 36011, тел. +38 (099) 292 96 94, эл. почта vynnykov@yandex.ru, ORCID 0000-0003-2164-9936 2* Кафедра «Автомобильных дорог, геодезии, землеустройства и сельских зданий», Полтавский национальный технический университет имени Юрия Кондратюка, проспект Первомайский, 24, Полтава, Украина, 36011, тел.