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0216U005161,
0115U000022
,
The study wave propagation and evaluation of sustainability layered homogeneous and heterogeneous natural systems and engineering structures.
Gorodetskaya Natalya Sergeevna,
19-01-2016
The Institute of Hydromechanics of the National Academy of Sciences of Ukraine
On the first stage of work the state of problem is investigational as on Ukraine and abroad, reasonable choice of models of environment, the experimentally-numeral methods of determination of parameters of soils are worked out. An aim of work is an analysis of wave processes in a semi-infinite strip, research of mechanical properties of fluid saturated soil, realization of experimental and theoretical analysis of the stress-strain state, numerical analysis. Research methods are a modal analysis of structure of the wave field, numerical and device experiments on research of mechanical properties of the soil arrays. In the first part the existence of resonance on heterogeneous waves at the antisymmetrical vibrations of in a semi-infinite strip is shown. Resonance shows up in the sharp increase of peak amplitude characteristics and change of phase-shift-frequencies of heterogeneous wave that corresponds to the first complex root of dispersible equalization. By the important feature of resonance on heterogeneous waves at antisymmetrical vibrations there is that a resonant situation is observed not for all values of Poisson's ratio. Resonant frequency coincides with frequency on that the first complex root of dispersible equalization degenerates in cleanly imaginary. From differential equalizations of motion of porous cohesive soil close system is got for determination of speed of deformations, tensions and closeness of environment. Derivatives are written in a difference schemefor creation of steady obvious chart (in two-dimensional case) for the calculation of components of rate of movement. The calculations of motion of homogeneous layer of soil of permanent thickness on a slope are produced. Determination of parameters of motion of viscid soils was conducted by alpha tests on the device of twisting loading standard. There is reduction of reverse speed and viscidity of standard during the successive increase of the landslide loading. In the third part the vertical vibrations of hard stamp are considered on poro-elastic fluid saturated layer (model of М. Bio) in the conditions of plane deformation. An analytical decision for displacements elastic and liquid phases of surface of layer with a jammed the lower bound under the action of a distributed harmonic load on the free surface on elastic and fluid phases for the plane deformation is got. A contact problem of vertical harmonic vibrations of hard stamp with impervious lower boundary is considered . The decision of task is represented by the method of orthogonal polynomials.
Городецька Наталія Сергіївна
Литвиненко Олена Романівна
Островерх Борис Миколайович
Рева Тамара Леонідівна
Савицький Олег Анатолійович
2020-04-02
Updated: 2025-12-07
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