Browsing by Author "Krysan, Volodymyr"

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Improving the Safety of Railway Subgrade When it is Strengthened Using Soil-Cement Elements
(Dnipro National University of Railway Transport named after Academician V. Lazaryan, 2019) Krysan, Vitalii; Krysan, Volodymyr; Petrenko, Volodymyr D.; Tiutkin, Oleksii L.; Andrieiev, Volodymyr S.
ENG: Abstract. The article identifies the main parameters of the drilling-mixing technology, which is the most effective in fixing weak soil bases during the construction and restoration of transport, industrial and civil structures. The difference of the technology developed by the authors is that the strengthening process is carried out at low pressure (0.15 ... 0.25 MPa). The relevance of the research is that the proposed technology requires less cost with high rates of restoring the strength of soil foundations. To prove the high quality of the technology, laboratory studies were carried out to determine the optimal characteristics of the soil-cement element, as well as the proportions and composition of the fixing solution. The dependences of the strength of soil-cement elements in the air-dry condition with cement content from 7% to 23% with water-cement ratio in solution 1 / 0.3 and with cement content from 13% to 37.5% with water-cement ratio in solution 1/0,6. During the experimental-industrial studies of the author's technology, the embankment was constructed with the soil-cement-reinforced elements for the access road approaches at one of the facilities in Kirovograd region, which ensured safety in the operation of a complex transport structure.
The Results of Experimental Studies of the Soil Cement Deformation Capacity under the "Loading-Unloading" Cycle Conditions
(IOP Publishing Ltd, 2025) Krysan, Volodymyr; Krysan, Vitalii; Tiutkin, Oleksii L.; Timchenko, Radomir; Krishko, Dmytro
ENG: The application of soil-cement elements for strengthening weak and subsiding foundations has become increasingly widespread in recent years. At the same time, the requirement for the technology of soil-cement production, which is a mixture of soil and cement mortar, is increasing. The quality control of the soil-cement production is in searching its properties, in particular deformation properties, which are decisive for strengthening the soil base. The paper describes the methodology for preparing soil-cement samples and the main analytical formulas for determining absolute and relative deformations. The results of experimental research on the deformed state of the samples, which were tested under the conditions of seven "loading-unloading" cycles, are given. Deformation graphs are constructed, and deformation values are analyzed, which indicate that in the stress range from 0.05 to 1.2 MPa, elastic deformations are already observed during the first cycle and the main compaction stage occurs. It is proved that the value of elastic deformation in seven cycles ranges from 0.14 mm to 0.18 mm and practically does not change after the third load cycle. The obtained results prove that they can be the basis of numerical analysis and that the elastic approach during mathematical modeling is correct.