The Effect of Vibration on the Sediment of Foundations of Turbine Units of Nuclear Power Plants

The foundations of turbine units are a complex structure. The reliability of turbine units is largely determined by their vibrational state and the nature of compaction of soil bases. In the case of uneven compaction of the soil bases, an unbalanced centrifugal force arises, which is undesirable in practice. With such small values of permissible deviations, there is a need to develop perfect calculation methods in which the real properties of clay soils will be taken into account most fully. To date, with such calculations, the influence of inhomogeneity parameters, the degree of physical nonlinearity, boundary conditions, variability of filtration coefficients, lateral pressure, instantaneous compaction and initial porosity on the nature of vibrational compaction of the soil has not been sufficiently studied. In the existing works taking into account the vibrational creep of the ground frame, the function characterizing the creep deformation is presented as the product of the measure of static creep and the functions of the amplitude of vibrations. The possibility of such a question is limited. The distribution of vibrational waves in ground formations remains in the shadow. A mathematical model of vibrational consolidation of heterogeneous soil is constructed. The constructed model takes into account all these factors. The questions of the existence and uniqueness of the solution of the problem are investigated. The methods of solution are substantiated. The possibility of using the iteration method is proved. Taking the initial conditions of the amplitude and vibration parameters, the problem of wave propagation in the ground is solved. Then, substituting the wave functions in place of the oscillation amplitude functions, the problem of vibration compaction is solved. This approach to the problem, in our opinion, is correct.