Кафедра "Тунелі, основи та фундаменти" (з 2016 року каф. "Мости та тунелі")
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ENG: Department of Tunnels, Bases and Foundations (2016 Department of Bridges and Tunnels)
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Browsing Кафедра "Тунелі, основи та фундаменти" (з 2016 року каф. "Мости та тунелі") by Author "Tiutkin, Oleksii L."
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Item Analysis of Deformed State Structures of the Kyiv Metro Running Tunnels on a Transition Zone from Spondylov’s Clay to Buchatskiy Sands(Дніпропетровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпропетровськ, 2014) Petrenko, Volodymyr D.; Huzchenko, Victor T.; Tiutkin, Oleksii L.; Tiutkin, Dmytro V.ENG: Purpose. In the section of changes geotechnical conditions of spondylov’s clay to buchatskiy sands may have significant structural deformation of running tunnels. It is necessary to identify the cause of deformities develop ways to minimize and based modeling and calculations to prove the effectiveness of measures to reduce deformation. Methodology. To solve the analysis problem of the stress-strain state (SSS) of the system «structure array» it was conducted the numerical simulation using the finite element method (FEM). On the basis of the obtained results the graphs were constructed and the dependencies were determined. Findings. The presence of weak watersaturated soils in tray of the tunnel on an area of transition from spondylov’s clay to buchatskiy sand causes significant increasing in strain construction of tunnels and general vibration liquefaction in soil basis. Also change the physical and mechanical characteristics of soils within the frames of tunnels influences on the level of strain state of most frames. Improved strain state settings of tunnels in areas of change soil characteristics of the array (especially at the bottom of casing) can be achieved by chemical consolidation of weak soils. Composition of solutions for fixing the weak soils should be determined based on the study of grain size, porosity, and other parameters of physical and mechanical and physical and chemical characteristics of soils. Originality. The basic cause significant strain on transition zone from spondylov’s clay to buchatskiy sands is found, that is explained by saturated phenomenon vibration liquefaction basis under the tunnel. Practical value. The approaches to reduce the strain in the construction of running tunnels in the transition zone from spondylov’s clay to buchatskiy sands are developed, as well as in the area of the station «Glybochytska» the Kyiv Metro.Item The Basing of Stabilization Parameters of a Fortified Railway Bed(Дніпропетровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпропетровськ, 2015) Petrenko, Volodymyr D.; Tiutkin, Oleksii L.; Kulazhenko, O. M.; Alkhdour, Ahmad M.ENG: Purpose. The article is devoted to stabilization parameters determination of reinforced railway bed. At the present time, the railway plays the leading role in transport system to ensure the needs of freight and passenger traffic. In modern conditions railway operation concentrates on ensuring the necessary level of track reliability, including the roadbed, this is one of the main elements of road structures. The purpose of this article is the determination of basic parameters of stress-strain state to stabilize the soil subgrade embankment by reinforced materials. Methodology. To achieve this goal the following tasks of researches were solved: the effect of reinforcing layer of geomaterial on deformation properties of soil subgrade in various design of strengthening was investigated, the distributions of stresses in the subgrade were determined, reinforced of geomaterials under state load. Experimental studies to explore the nature of the deformation model subgrade at various degrees of stress were carried out. Findings. The analysis of the results of performed experimental and theoretical studies permitted to do the following conclusions. In conducting researches determined the distribution of stresses in the subgrade reinforced geomaterials under static load. The complex of experimental studies allows exploring the nature of the deformation model subgrade at various degrees of stress. Originality. On the basis of the theoretical studies have been regarded the problem of determining the stress-strain state of subgrade reinforced geomaterials by measuring stresses in its application for step loads. Practical value. The practical value was presented by the results of evaluating the effect of reinforcing way for changing the stress-strain state of subgrade.Item Estimation of Subgrade Strengthening Influence Using Soilcement Elements(Дніпропетровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпро, 2016) Petrenko, Volodymyr D.; Tiutkin, Oleksii L.; Sviatko, Ilona O.ENG: Purpose. The aim of this work is to identify dependencies and options to strengthen the roadbed and a weak base by grouting piles. Analysis of software package SCAD to assess the effect of the selected option of strengthening the construction of spatial subgrade models. Methodology. In this paper the method of calculation of the soil mass in the software package SCAD is considered, which is a universal accounting system of finite-element analysis of structures and is focused on solving problems of designing buildings and structures rather complex structure. The finite element method is among the most modern and effective methods for the calculation of structures for various purposes. In the simulation, we get a complete picture of the stress-strain state of the study area, as well as the value of the limit load, rainfall, and so on. The spatial model based on the finite element volume, to better address the real characteristics of the soil mass, meets all the geometric characteristics of size and natural subgrade and the top structure the path that has been adopted in Ukraine. Findings. It was found that the most effective option to strengthen the roadbed, when applying grouting piles at the base of the subgrade and body, is to strengthen the five piles. At the same time there is even strengthen the soil mass at the level of 25 … 30% of the entire depth. However, even with the strengthening of the only two piles at the base of the effect of the strengthening of 14.1%. Established equation is linear and describes the decrease in strain. Taking into account the results of the research can be concluded that the consolidation is proportional to the depth with any number of piles. The dependence of the strain on the number of piles adheres to a polynomial function. Strengthening the bases of the subgrade and body depth also occurs in proportion with any number of piles. Originality. Design scheme generation algorithm for the calculation of the subgrade on a weak basis by finite element method was determined. The selection of strength characteristics of soils and the design parameters for use during the numerical simulation was completed. Load process simulation of the system by rolling stock was grounded. Practical value. Analysis of stress-strain state of «weak base-subgrade» allows you to see the basic laws work the soil and take the necessary measures to enhance the cross-section profile of jet-grouting elements.Item Scientific Evidence for Walls Fastening Technologies of Working Trench by the Special Method «Slurry Wall» for Shallow Subways’ Stations(Дніпропетровський національний університет залізничного транспорту імені акдеміка В. Лазаряна, Дніпропетровськ, 2014) Borschevskiy, S. V.; Petrenko, Volodymyr D.; Tiutkin, Oleksii L.; Kulazhenko, Yevhenii Yu.; Kulazhenko, Olena M.ENG: Purpose. It’s necessary to carry out justification of fastening technology and the choice of the optimal variant, creating dependency diagrams of moving for idealized cases by means of automated methods of calculations. Methodology. To achieve this goal, the finite element solid models, which reflect the design of the working trench for the shallow subways’ stations, with four ways to fix the “slurry wall”, as well as a calculation and analysis of the stress-strain state of structures and fixtures calculated using the complex with using the finite element method(FEM) is built in the software package SCAD. Findings. The analysis of the stress-strain state and movements of various fundamental systems of soil nailing and comparing the results by displaying the calculations results of main and equivalent stresses, using the built-in postprocessors in software package SCAD. Namely, were identified extreme tensions arising in the wall and strut rail. It is built the tables and the resulting graph of behavior of the structural fastening condition; the parameters change of the surrounding array on the base of the research. It is possible to analyze and compare the operation of different constructions of slopes fastening of working trench by means of their help. Originality. In solving this problem have been analyzed and studied the behavior of the structure fastening the «slurry wall», and its stress-strain state, the location and the fastening areas that need further elaboration, study and introduction of measures to strengthen the construction of fences and auxiliary fixing elements, presented with metal strut rail. Practical value. In the era of highly advanced building technologies in the construction of underground facilities with using the special method of “slurry wall” the question arises about the quick selection of optimal parameters, elements and methods of securing its walls from excessive strain and avoidance of displacement to the calculation of possible combinations of permanent loads from soil in the construction of the working trench.Item Solution of Task of the Mobile Loading in the Dynamic Statement(Дніпропетровський національний універсиет залізничного транспорту імені академіка В. Лазаряна, Дніпропетровськ, 2013) Petrenko, Volodymyr I.; Petrenko, Volodymyr D.; Tiutkin, Oleksii L.ENG: Purpose. That is the feature of static work of tunnel constructions, that their stress-strain state is formed in interaction with a surrounding rock mass. But the dynamic component of stress-strain state of such constructions is also large, as tunnel constructions are perceived, except for permanent action of surrounding rock mass, spectrum of the dynamic loadings. Analyzing every type of dynamic action, it follows also to give him appraisement from position of reflection in normative documents, as the account of most dynamic actions is only declared in them without development of some methods. Methodology. For research of influencing of the mobile loading in the dynamic statement model it is some changed in order to correctly attach loading between columns as an impulse. As well as at the conducted research of the mobile loading in the static statement, in which it was found out, that his influence on the station construction depended on the depth of contour interval, at the solution of the same task in the dynamic statement explored two models – with the depth of contour interval 5 m and 10 m. Findings. It is possible to testify from the conducted analysis, that the complex analysis of the station construction with conducting of static and dynamic calculations allows to obtain more complete information about stress-strain state, which allows to estimate the state of elements in different situations, some of which more reliable result in emergency situations and must be forecast. Originality. Influencing of the mobile loading in the static and dynamic statements has been analyzed. Practical value. The calculations of the underground stations of shallow contour interval are complemented by an important calculation in the dynamic raising, and the results of such complex analysis can be considered more complete.