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Browsing Статті КМТ by Author "Dubinchyk, Olha I."
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Item Comprehensive Analysis of the Retaining Pile Structure with the Determining the Stability Factor by Numerical Methods(EDP Sciences, 2019) Dubinchyk, Olha I.; Petrenko, Volodymyr D.; Ihnatenko, Dmytro Yu.; Kildieiev, Vitalii R.EN: Abstract. The paper highlights the results of the complex analysis of the retaining pile structure with determining the stability coefficient by numerical methods. To achieve this purpose, after designing a structure with jet grouting piles, the research of the stability coefficients of the landslide hazard slopes in the software complex "OTKOS" and its stress state in the software complex LIRA-CAD system was conducted. The relevance of the completed research is to develop rational parameters of the pile structure. A comparison of determining the stability coefficient of a slope by different methods for the existing landslide stretch for the public roadways of local significance С141017 (Lviv-Shehyni) – Sudova Vyshnia was carried out. Originality of the paper lies in the fact that to determine the stability coefficient in the model, the layeredness of the slope under study is taken into account, and the nonlinear volumetric problem is solved in the course of the numerical analysis of the stress state. The rational distance between piles in the gap and the length of the pile under a certain percentage of cement and ground was justified.Item Geotechnical Analysis of Optimal Parameters for Foundations Interacting with Loess Area(EDP Sciences, 2020) Dubinchyk, Olha I.; Bannikov, Dmytro O.; Kildieiev, Vitalii R.; Kharchenko, V.EN: The article highlights results of the geotechnical analysis of the stress and strain state for the base of a subsoil massif under its interaction with the strip foundations. The massif is represented by loess soils which while soaking give overtime subsidences that complicate the operation of a building or a structure. Through geotechnical iterative research, optimization of the parameters for strip foundations on four axes at a four-storeyed residential building is carried out. Checks are performed on two groups of limiting states for scenarios of soil occurrence in natural, moistened and compacted states. The optimum dimensions in the width of strip foundations are selected, they give approximately the same strain values of the base after the creation of the soil bedding with its layer-by-layer compaction. The relevance of this research is to develop optimal parameters in the design of strip foundations for shallow depth on subsidental loess soils.Item Predicting Changes of the State of a Bridge Reinforced With Concrete Superstructures in View of Operational Changes(Uniwersytet Zielonogórski, Poland, 2019) Ovchynnykov, Pavlo A.; Dubinchyk, Olha I.; Tiutkin, Oleksii L.; Kildieiev, Vitalii R.; Sedin, Volodymyr; Bikus, KaterynaENG: Purpose. Bridges are the most durable and heavy duty transport facilities. Therefore, the solution of scientific and technical problems of superstructure service life predicting in the context of defect and damage accumulation that is, taking into account changes in operating conditions is on the front burner. Methodology. To solve the problem of superstructure service life predicting, the work proposes the bases and methodological developments of creep theory with increasing loads as well as regression analysis of the laboratory experiments results. Findings. The main parameters of reinforcement corrosion growth in the concrete cracks were determined under laboratory experiments. Based on the obtained results the approximate analytical dependences concerning reinforcement corrosion depth change in time at a constant value of crack width were selected. The paper substantiates validity of the analytical dependences as a result of regression analysis; proposes formulas for determining the corrosion rate of rebar in reinforced concrete superstructures. The obtained analytical dependences allowed for development of the process of predicting superstructure state changes in view of operational changes. Originality. For the first time, using laboratory experiments, the development of reinforcement corrosion in concrete cracks was determined together with assessment of time-varying corrosion depth. Practical value. Approximating analytical dependences, with a high level of confidence (95%), allow predicting reasonably the crack width in reinforced concrete superstructure. This is a significant practical value for bridge superstructure service life predicting in the context of defect and damage accumulation that is, taking into account changes in operating conditions. Formulas for determining the corrosion rate in rebar with the ability to predict the active area of corroded reinforcement have also practical value.