Naidonova V. The bearing capacity of drilling piles in view of additional load friction forces of soil

The purpose of the dissertation is to improve the methods of determining the bearing capacity of drilling piles, taking into account the loading forces of soil friction on the side surface. The object of research is the interaction of the lateral surface of the pile with the subsurface soil base; methods − analysis of normative and literary sources, scientific and technical achievements; experimental methods of investigation of loading forces of soil friction and bearing capacity of piles in laboratory and field conditions; standard methods for determining the physical and deformation properties of soils; methods of mathematical statistics for processing the results of experiments; numerical finite element method for analysis of stress-strain state of the "soil − pile" system; results − the technique of determination of maximum loading force of friction of soil Pn on the lateral surface of drilling piles was improved, which allows to substantially reduce the potential influence of these forces on the bearing capacity of piles in structurally unstable soils; improved the method of DBN determination of the calculated load on the piles according to the results of standard soil tests with natural piles in structurally unstable soils, which allows to reasonably increase the compressive load on piles up to ≈20%; the method of modeling the soil-pile system with structural-unstable soils under the action of the Fdu pull-out loads was improved and allows to assign the value of the friction loading forces Pn with the corresponding transition coefficient k0: Pn = Fdu/k0 in the "PLAXIS 3D Foundation", software package the results of the calculation by the finite element method are consistent with the test results of field experimental piles; implemented − in Kharkov project organizations: TREST PAT "Zhitlobud-1" (Kharkov); "Trans Stroy Complex" LLC (Kharkov); used in the calculation on the object of construction of a residential complex in Kharkov, as well as used in the educational process of the O.M. Beketov National University of Urban Economy in Kharkov.