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Information × Registration Number 0216U008327, 0115U000022 , R & D reports Title The study wave propagation and evaluation of sustainability layered homogeneous and heterogeneous natural systems and engineering structures. popup.stage_title Head Gorodetskaya Natalya Sergeevna, Registration Date 28-12-2016 Organization The Institute of Hydromechanics of the National Academy of Sciences of Ukraine popup.description2 The second stage of the work carried out to develop of numerical methods conducted to quantify the stress strain state of limited soil environment considering changing its parameters and their influence on the dynamic state of the environment at different boundary conditions. Research object - layered elastic and pruzhnoporysti saturated liquid environment. Purpose - analysis of wave processes in elastic pivshari; study the mechanical properties of saturated soils of the experimental and theoretical analysis of stress-strained state, numerical analysis. Methods - modal analysis of the structure of the wave field numerical experiments Panel and Research of mechanical characteristics of the soil mass, solution of differential equations with initial and boundary conditions. The first section examines the features of the wave field in reflection at normal waves forced antysymmetrychnyh elastic vibrations are considered. The overall focus was on analyzing the distribution of energy that is brought in by pivshar modes propagating. In the second chapter conducted a systematic exposition of differential equations and formulas to determine the stress state and the movement of the elastic and viscous compressible media and show presence analogy (compliance), which makes it possible to make the equation of motion of a viscous body to the National Assembly in analog form TP. The numerical method within the finite difference equations based on distributed networks with nodes of unknown parameters. If you are using a numerical method of finite differences to solve the problems there was the possibility to use program designed to determine the stress strain state for simple test tasks and underground structures, namely the natural slope homogeneous soil that is saturated seepage. Determined that the necessary and most reliable means of ensuring the stability of slopes is the creation of drainage systems. All other measures (splanuvannya slope pryvantazhennya, retaining walls, etc.) Should be considered as additional and temporary. In the third chapter dealt vertical oscillations rigid rectangular stamp on porystopruzhnomu saturated liquid (Model MA Bio) layer. The analytical solution for displacement of the solid and liquid phases of the surface layer of the lower edge restrained by the action of a distributed harmonic load on the free surface in a porous solid and liquid phases. On the second stage the work was carried out to develop numerical methods on quantitative estimation of stress strained state of limited soil media in view of changing its parameters and their influence on dynamic state of the media with different boundary conditions accounted. The research object is the layered elastic and liquid saturated porous media. The aim of this work is the analysis of wave processes in an elastic halfspace; the study of mechanical properties of an saturated soils, conducting the stress strain experimental, theoretical and numerical analysis as well. The research methods are the modal analysis of the structure of the wave field, numeric and instrumental experiments on the study of mechanical characteristics of ground mass, solving systems of differential equations with initial and boundary conditions. In the first section the features of wave field in reflection of normal waves from forced inelastic fluctuations of antisymmetric vibrations were studied. The common attention was focused on the analysis of energy distribution, payable in half space on modes that are distributed. The systematic outline of the differential equations and formulas to determine the stress state and elastic and viscous compressible media motion was carried out in the second section to show the existence of analogies (compliance), that allows to create the equation of motion of a viscous body analog to the elasticity form. We developed a numerical technique within finite difference equations based on dispersed grid with nodes of unknown parameters. In case of finite difference numerical method application for the solution of problems with the before developed programs to determine the stress strain state for test and simple ground structures tasks, namely the natural slopes of the saturated homogeneous soil with account of flow filtration. It was determined that the necessary and the mostly reliable means of ensuring the stability of slopes should be considered the creation of an water drainage system. All other works (such as slope plannering, retaining walls, etc.) should be considered as additional and temporary. The third section considered the vertical vibrations of rigid stamp on a porous elastic, liquid saturated layer (M. Bio model). Analytic solution for solid and liquid phase of the symmetric layer surface with the fixed lower side when acted with the distributed harmonic load on the free surface of porous solid and liquid phase was obtained. Product Description popup.authors Городецька Наталія Сергіївна Литвиненко Олена Романівна Островерх Борис Миколайович Рева Тамара Леонідівна Савицький Олег Анатолійович popup.nrat_date 2020-04-02 Close