Кафедра "Теоретична та будівельна механіка"<br>(з 2022 р увійшла до складу кафедри Технічна механіка ДІІТ) (з 2016 року об’єднано каф. "Теоретична механіка" та каф. "Будівельна механіка")

Permanent URI for this communityhttp://crust.ust.edu.ua/handle/123456789/9307

ENG: Department "Theoretical and Structural Mechanics" "Theoretical Mechanics" and "Structural Mechanics"

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Comparative Analysis of Options for Strengthening the Railway Subgrade with Vertical Elements
(Printing House “Technologija”, Kaunas, Lithuania, 2021) Tiutkin, Oleksii L.; Keršys, Robertas; Neduzha, Larysa
ENG: In paper the task set to investigate and determine the impact of the parameters for strengthening with vertical elements (piles) on the stress and displacement of the track superstructure. The scientific hypothesis is the possibility of selecting such parameters of these elements that minimally affect the stress state of the track superstructure. For this finite-element models of two options for strengthening have been developed. Using a professional complex at different values of deformation characteristics values of displacements and stresses were obtained. The analysis of the stress-strain state for both options reveals that the more effective option of strengthening the subgrade. It has a more positive effect on the deformation state of the subgrade, reduces the vertical displacement of the track superstructure, reduces its stress state, the value of which allows us to testify to the normal operation of the subgrade.
Research of the Strained State in the "Subgrade – Base" System at the Variation of Deformation Parameters
(Kaunas Univ. of Technology, Lithuania, 2020) Tiutkin, Oleksii L.; Keršys, Robertas; Neduzha, Larysa O.
ENG: When building the railway lines, there are several cases of the subgrade construction, which in the future is the cause of poor operation. It lies in the fact that "diseases": defects and deformations emerge in the subgrade and the base on which it is built. These phenomena are due to the fact that, firstly, the quality of the subgrade is not consistent with the normative deformation parameters, and secondly, the soil foundation of the subgrade is weak. The purpose of this research is to obtain the strained state of the "subgrade – base" system at the variation of the deformation parameters of its elements. For this, finite-element models were developed, in which the track superstructure with assembled rails and sleepers, the subgrade and its base were reproduced. Numerical analysis was carried out in the static position on trainloads. The obtained results of the strained state of the models are components of horizontal and vertical displacements. The results of the research show that the impact of the base with lower deformation parameters is greater than in the subgrade with a reduced, unlike regulatory, the elastic modulus.