THEORETICAL STUDIES OF THE INTERACTION OF PLANAR DEEP VIBRATORY COMPACTOR WITH CONCRETE MIXTURE
Journal Title: Вісник Кременчуцького національного університету імені Михайла Остроградського - Year 2018, Vol 1, Issue 109
Abstract
Purpose. To study the interaction of planar depth vibration compactor to the concrete medium which are presented in the form of a half-space. Methodology. The advantage of deep compaction of concrete mix is described. Based on the analysis of existing structures and methods of deep compaction of concrete mixes, a deep sealer in the form of a flat vertical plate is proposed, in the upper part of which a horizontal vibration exciter is mounted. To determine the character of the interaction of the vibrational compaction depth with the concrete mixture, the dynamic system "vibro – compaction-concrete medium" was studied, in which the latter is presented in the form of a system with distributed parameters, taking into account the elastic, viscous, inertial and energy properties of the compacted concrete mixture. The partial differential equation describing the change of stresses in the compacted medium depending on the dynamic elastic modulus, coefficient of dynamic viscosity, coefficient of inelastic resistance and inertia of the compacted medium in functional dependence on the density, relative deformation and consistency of the concrete mixture is composed. An oscillation wave equation describing the propagation of viscous-elastic-plastic deformation waves in a compacted concrete mixture has been developed. Boundary conditions have been used to solve the wave equation of oscillations. The first boundary condition describes the force interaction of a vertical plate with a compacted concrete medium under the action of harmonic perturbation, represented as an imaginary part of the complex function. The second boundary condition describes the propagation of deformation waves in the half-space and shows that the propagation of the perturbation wave is unlimited and at a distance equal to the length of a quarter of the wave, the relative deformation of the compacted medium is zero. The constant of integration (complex function), satisfying the boundary conditions has been found. Results. Based on the solution of the wave equation of oscillations describing the propagation of deformation waves in the half-space, the phase velocity of the propagation of the deformation wave, the wave number and the perturbation absorption coefficient in the compacted medium have been determined. The law of propagation of viscous-elastic-plastic deformation waves in a compacted concrete mixture is represented as a half-space in a complex form. Originality. Theoretical expressions that accurately describe the behavior of a real dynamical system "vibration ma-chine - compacted environment" compaction of concrete mixes deep vibration compactor, both from plastic and from hard concrete mixtures, by the application of horizontally directed oscillations have been highlighted. Practical. The obtained analytical dependences allow to substantiate the rational parameters of the deep vibrating compactor, to choose a rational method of vibration impact on the compacted medium and the appropriate mode of operation depending on the consistency of the concrete mixture and the thickness of the compacted layer. References 11, tables 0, figures 21.
Authors and Affiliations
A. Maslov, J. Batsaikhan
Keywords
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