Methods of tunnel inspection and testing of metal corrugated structures at km 228 + 160 of Kyiv-Kharkiv-Dovzhansky highway

Koval, Maksym; Koval, P. M.; Kovalchuk, Vitalii

doi:10.36100/dorogimosti2020.21.250

Cited by 4 publications

(11 citation statements)

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“…In [17], the authors evaluated the stresses and magnitude of the plastic hinge that occur in the metal of the conduit structures, taking into account only the scheme of placing loads above the conduit with constant values of the height of the backfill above the conduit (h) and the degree of compaction (R); their values were taken by the authors to be equal, respectively, to 2.0 m and 97 %. However, the cited work did not evaluate the two-factor influence -the size of the backfill above the structure and the degree of compaction of the soil backfill on the stress and plastic hinge.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…Based on the review of studies [4][5][6][7][8][9][10][11][12][13][14][15][16][17], it was established that most works report the results of the assessment of the stressed-strained state of facilities made of metal corrugated structures, which are subjected to the action of variable loads from vehicles. The tasks of assessing the stressedstrained state of structures made of PMCS, taking into account a set of factors, namely the degree of compaction of the soil fill and the height of the embankment above the vault of the structure, remained unsolved.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…It should be noted that transport structures made of PMCS work as a "soil fill-structure" system, and at the same time the load-bearing capacity depends on the deformation modulus of the soil fill. Therefore, in this work, the design value of the deformation modulus of soil fill is determined by the formula recommended in [17][18][19]:…”

Section: Procedures For Estimating Stresses and Size Of Plastic Hinge...mentioning

confidence: 99%

“…where γ n , γ m are coefficients taking into account the safety class of the structure; m is the modular ratio determined according to [17]; h s is the height of backfill above the surface of metal structures; RP is the relative degree of compaction of soil fill; k v is a calculated parameter determined depending on the angle of internal friction of the soil fill φ k , H is the vertical distance from the top of the structure to its largest horizontal dimension; 100 is the transfer coefficient, kPa.…”

Section: Procedures For Estimating Stresses and Size Of Plastic Hinge...mentioning

confidence: 99%

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Assessing the stresses and magnitude of plastic hinge in a tunnel conduit made of precast metal corrugated structures taking into account the soil backfill parameters

Kovalchuk,

Karnakov,

Onyshchenko

et al. 2023

EEJET

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The object of research is a tunnel conduit made of star-shaped metal corrugated structures. The stresses and magnitude of the plastic hinge occurring in the metal corrugated structures of the tunnel conduit were investigated, taking into account the degree of compaction and the height of the soil backfill. It was established that when the height of the backfill above the tunnel conduit made of precast metal corrugated structures increases and the degree of compaction of the soil backfill decreases, there is an increase in the values of stresses and plastic hinge in metal structures. With the height of the backfill above the conduit equal to 2.75 m and the degree of compaction of the soil backfill RP=80 %, stresses of 235.89 MPa are reached, exceeding the permissible 235 MPa. At the same time, the value of the plastic hinge is 1.03, which exceeds the normative 1.0. It was established that at embankment heights above the tunnel conduit structures from 1.75 m to 2.0 m, the smallest difference in stresses and magnitude of the plastic hinge is observed. At RP=98 %, the stress difference is 0.66 MPa, and the value of the plastic hinge is 0.008. In the case of the height of the embankment above the conduit from 1.5 m to 1.75 m, the stress increase was 5.5 MPa, and the value of the plastic hinge – 0.031. When the embankment height increases from 2.0 m to 2.25 m, the stress difference is 7.57 MPa, and the value of the plastic hinge is 0.041. It was determined that when the height of the embankment above the conduit was increased by 1.0 m in the range from 0.75 m to 1.75 m, the stress difference at RP=98 % increased by 27.84 MPa. However, when the height was increased by 1.0 m in the range from 2.75 m to 3.75 m, the stress difference increased by 12.66 MPa. At the same time, the value of the plastic hinge at embankment heights from 0.75 m to 1.75 m increased by 0.139, and at embankment heights from 2.75 m to 3.75 m – by 0.093

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Section: Procedures For Estimating Stresses and Size Of Plastic Hinge...mentioning

confidence: 99%

Section: Procedures For Estimating Stresses and Size Of Plastic Hinge...mentioning

confidence: 99%

See 2 more Smart Citations

Assessing the stresses and magnitude of plastic hinge in a tunnel conduit made of precast metal corrugated structures taking into account the soil backfill parameters

Kovalchuk,

Karnakov,

Onyshchenko

et al. 2023

EEJET

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“…Both were worried about the fate of Ukrainian intellectuals, and saved many of them from the clutches of the KGB and repression. Among them were also the Ukrainian writer Oles’ Honchar, who was criticized by the party for his “nationalistic” novel Cathedral (Sobor, 1968) (Zhuk 2010, 53–64; Koval’ 1989; Shapoval 2011, 345; Vozianov 2005, 47), Iurii Mushketyk, a talented Ukrainian prose writer, and Pavlo Skochii, the deputy of the first democratic session of the Lviv oblast Rada in 1990 (Skochii 2005, 76–82; Bilodid 2005, 35). Shevel was sincerely disturbed by the imprisonment of Ukrainian writers.…”

Section: Shevel’s Vacillationmentioning

confidence: 99%

Political Affinities and Maneuvering of Soviet Political Elites: Heorhii Shevel and Ukraine’s Ministry of Strange Affairs in the 1970s

Bertelsen

2019

Nationalities Papers

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This article examines the goals and practices of the Ministry of Foreign Affairs in Ukraine in the 1970s, a Soviet institution that functioned as an ideological organ fighting against Ukrainian nationalists domestically and abroad. The central figure of this article is Heorhii Shevel who governed the Ministry from 1970 to 1980 and whose tactics, strategies, and practices reveal the existence of a distinct phenomenon in the Soviet Union—the nationally conscious political elite with double loyalties who, by action or inaction, expanded the space of nationalism in Ukraine. This research illuminates a paradox of pervasive Soviet power, which produced an institution that supported and reinforced Soviet “anti-nationalist” ideology, simultaneously creating an environment where heterodox views or sentiments were stimulated and nurtured.

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Assessment of the State of Stress and Deformation of Metal Corrugated Pipe Structures Taking Into Account Its Diameter and Thicknesses of the Corrugated Sheet

Kаrnakov,

Коvalchuk,

Onyshchenko

2023

MCA

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The analysis of research works on the assessment of the stress-strain state of prefabricated metal corrugated structures of transport facilities was performed. It was established that the stresses and deformations of structures made of ZMGK depend on a complex of influencing factors: the amount of static and dynamic loads, the height of the backfill above the vault of the structure, the parameters of corrugation waves, etc. However, the interconnected effect of the pipe diameter and the thickness of the metal corrugated sheet on the stresses that occur in the metal pipe structures has not been established. The object of research is metal corrugated pipe constructions. To assess the stress state of the pipe, the influence on the stress of the cross-section of the pipe and the thickness of the metal corrugated sheet of the structure are taken into account. It was established that the geometric parameters of the cross-section of the pipe and the thickness of the metal corrugated sheet of the structure have a significant influence on the stress state of metal corrugated pipe structures. When the diameter of the pipe increases, the amount of stress that occurs in metal structures increases. However, with an increase in the thickness of the corrugated sheet, the amount of stress, with the same pipe diameter, decreases. Increasing the thickness of the sheet from 3.0 mm to 7.0 mm leads to a decrease in the stresses in the pipe metal by 50.39%. When the diameter of the pipe changes from 1.0 m to 6.0 m with a metal thickness of the corrugated sheet equal to 3.0 mm, the magnitude of the stresses increased by 7.38 times, with a sheet thickness of 4.0 mm ‒ by 7.8 times, with a thickness of 5.0 mm sheet – 8.08 times, 6.0 mm sheet thickness – 8.28 times, and 7.0 mm corrugated pipe sheet thickness – 8.43 times. It was established that the gradual increase in the thickness of the corrugated sheet of the structure leads to a decrease in the stress difference between the previous thickness of the sheet and the increased one. With a pipe diameter of 6.0 m, the stress difference that occurs when the thickness of the corrugated sheet is 3.0 mm and 4.0 mm is 21.35 MPa, with a thickness of 4.0 mm and 5.0 mm, the stress difference is 14.16 MPa, at 5.0 mm and 6.0 mm, the difference in stress values is 10.25 MPa, and with increased sheet thickness from 6.0 mm to 7.0 mm, the difference in stress values is 7.76 MPa. The obtained results of the stress state of prefab metal corrugated pipe structures can have practical application in the case of acceptance of the technical and economic justification, regarding the determination of the pipe diameter and the thickness of the metal corrugated sheet of the structure. One of the limitations of the application of these research results is the assessment of the stress state of the pipe made of prefabricated metal corrugated structures with the parameters of the corrugated waves of 150×50 mm. Other parameters of corrugation waves are not taken into account in this study.

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Methods of tunnel inspection and testing of metal corrugated structures at km 228 + 160 of Kyiv-Kharkiv-Dovzhansky highway

Cited by 4 publications

References 11 publications

Assessing the stresses and magnitude of plastic hinge in a tunnel conduit made of precast metal corrugated structures taking into account the soil backfill parameters

Assessing the stresses and magnitude of plastic hinge in a tunnel conduit made of precast metal corrugated structures taking into account the soil backfill parameters

Political Affinities and Maneuvering of Soviet Political Elites: Heorhii Shevel and Ukraine’s Ministry of Strange Affairs in the 1970s

Assessment of the State of Stress and Deformation of Metal Corrugated Pipe Structures Taking Into Account Its Diameter and Thicknesses of the Corrugated Sheet

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