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Information × Registration Number 0210U003107, 0106U002150 , R & D reports Title Investigation of assurance and stability of space systems in liquid under action of natural and technogeneous loads popup.stage_title Head Seimov Valentin Mykhailovich, Registration Date 19-01-2010 Organization The Institute of Hydromechanics of the National Academy of Sciences of Ukraine popup.description2 Object of research - modelling of interaction of the geotechnical vibrator with the layered soil basis, seismic stability of a sea gravitational platform and stability of soil slopes. The work's purpose - a complex of theoretical researches and numerical experiments of studied processes on the basis of mathematical modelling with use of modern numerical methods for the purpose of studying of fundamental laws: dynamics of system a stamp-ground at the account of the limited capacity of a source; seismic stability of sea gravitational platforms at interaction with a ground and the water environment; changes of a tension of rocks at deformations of the soils caused by a viscous current under the influence of a body weight and displacement of adjoining layers heterogeneity. Research methods - numerical modelling of mechanical processes in constructions and the devices interacting with the soil and water environment under the influence of dynamic loadings, in soil structures, geoinformation methods. The method of calculation of oscillations of the squared shape plate bases in the plan and vibrostamps (vibromachines for research of dynamic properties of a soil) is developed at inertial influence from a source of the limited capacity. Essential influence of lamination of the basis and weight of a plate on parametres of fluctuations is shown. In the considered model of system the resonances connected with inertial interaction in system "a stamp-base" for a massive stamp and with final thickness of a layer for a stamp of small weight are considered. The technique and computer programs for the numerical analysis of vertical oscillations of a platform are developed. Dependences of displacement functions (vertical movings and platform accelerations) are established at set analogous accelerogrammes from a various kinds of parametres - weight of a platform, elastic characteristics of the soil basis on model of elastic half-space, heights of a layer of a liquid. The system of the equations is developed for the numerical decision of problems on deformation of soil structures on model of a viscous current and algorithms and programs of the decision of test problems and visualisation of results for the subsequent analysis are created. The important result about close coincidence of potential (possible) surfaces of shift to surfaces of a current of a knitting material of the considered soil structures is received. As they essentially differ from round-cylindrical forms of surfaces of shift limitation of application of the approached methods from here follows. It is shown that owing to distribution of speeds in the form of vortical structure in the field of roughnesses in the basis landslide bodies the tension which increases resistance of a slope to shift is formed. The analysis of a tension of a ground which fills roughness, is executed by comparison of the maximum values of pressure. Introduction of the developed technique to an estimation of firmness of the soil basis riverbed piles of bridge transition through the Kanev water reservoir of the Big ring highway round Kiev by definition of kinematics of riverbed stream and depth of the general and local washout round support is spent. Product Description popup.authors Єрмоленко Наталія Павлівна Лемберг Емма Давидівна Лукіна Алла Григорівна Островерх Борис Миколайович Рева Тамара Леонідівна Савицький Олег Анатолійович Сеймов Валентин Михайлович Соболь Тетяна Володимирівна popup.nrat_date 2020-04-02 Close