The Assessment of Dynamic Behavior of Heterogeneous Systems taking into account Non-linear Viscoelastic Properties of Soil

• Main Authors: T.Z. Sultanov, D.A. Khodzhaev, M.M. Mirsaidov
• Format: Article
• Language: English
• Published: Peter the Great St. Petersburg Polytechnic University 2014-02-01
• Series: Инженерно-строительный журнал
• Subjects: earth dam; soil rheology; heterogeneity; non-linearity; viscoelasticity; accelerogram; hydro-static pressure; kinematic effect
• Online Access: http://www.engstroy.spb.ru/index_2014_01/09.pdf

The paper reviews in detail the modern state of the calculation problem for non-linear rheological properties of soil in making an assessment of the stress-strain state of ground structures. The mathematical statement, methods and algorithms to assess the dynamic behavior of earth structures taking into account heterogeneous specific features of a structure, linear, non-linear-elastic, non-linear-viscoelastic properties of soil under different dynamic effects are given. The result of a dynamic calculation is the study of unsteady forced oscillations of a number of earth dams taking into consideration non-linear viscoelastic properties of soil and heterogeneous specific features of a structure. The obtained results permit us to reveal several mechanical effects of theoretical and practical value. It was revealed that under high-frequency intensive effect the character of structures oscillations having low-frequency specter has three pronounced stages: an initial one that is characterized with low amplitudes, transitional one, when the swinging of structure occurs; and the stage of free oscillation with realized amplitude and frequency of own vibrations. In spite of the high intensity of high-frequency effect, which causes large stresses in the body of the discussed dams, the calculation of non-linear strain in the material does not greatly distort the pattern of linearly elastic design.