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EXPERIMENTAL INVESTIGATION OF STEEL FIBERS’ EFFECT ON THE IMPROVEMENT OF MECHANICAL PROPERTIES OF CONCRETE SEGMENTAL LINING IN MECHANIZED TUNNELING ; UTJECAJ ČELIČNIH VLAKANA NA POBOLJŠANJE MEHANIČKIH SVOJSTAVA BETONSKE SEGMENTNE OBLOGE
The lining system, used in tunnel boring machines, is made of precast concrete segments. The use of steel fibers in this kind of support system can not only decrease production time and costs but also can improve compressive, tensile as well as flexural behaviors. A study has been carried out to examine the mechanical properties of segments in the Tabriz metro line-2 project using three types of steel fibers: 3D, 4D, and 5D. Various experiments were investigated to monitor the workability of Steel Fiber Reinforced Concrete (SFRC) under various loads. The results confirmed an improvement in the specimens’ mechanical properties because of these types of steel fibers. 5D, 4D, and 3D fibers provided the greatest effect on the tensile and flexural strength of steel fiber-reinforced concrete, respectively. The 28-day compressive, tensile, and flexural strengths of the specimens are incremented by 13%, 68%, and 154%, respectively. In addition, by conducting tests on the orientation of steel fibers, placing the fibers perpendicular to the load can improve the compressive strength of concrete by almost 18%. ; Sustav obloge koji se koristi u strojevima za bušenje tunela izrađen je od predgotovljenih betonskih segmenata. Upotreba čeličnih vlakana u ovoj vrsti potpornoga sustava ne samo da može smanjiti vrijeme i troškove proizvodnje, već također može poboljšati tlačna, vlačna i savojna svojstva. U ovoj studiji istražen je učinak triju vrsta (3D, 4D i 5D) čeličnih vlakana na mehanička svojstva segmenata u projektu linije 2 metroa Tabriz. U tu svrhu provedeni su pokusi tlačne, vlačne i savojne čvrstoće te test slijeganja. Rezultati su potvrdili poboljšanje mehaničkih svojstava uzoraka zbog prisutnosti ove vrste čeličnih vlakana, a također povećanjem sadržaja vlakana 28-dnevna tlačna, vlačna i savojna čvrstoća uzoraka povećava se za 13 %, 68 % odnosno 154 %. Osim toga, provođenjem ispitivanja orijentacije čeličnih vlakana utvrđeno je da se pomoću njih može povećati tlačna čvrstoća betona za oko 18 %, tako da postavljanje ...
EXPERIMENTAL INVESTIGATION OF STEEL FIBERS’ EFFECT ON THE IMPROVEMENT OF MECHANICAL PROPERTIES OF CONCRETE SEGMENTAL LINING IN MECHANIZED TUNNELING ; UTJECAJ ČELIČNIH VLAKANA NA POBOLJŠANJE MEHANIČKIH SVOJSTAVA BETONSKE SEGMENTNE OBLOGE
The lining system, used in tunnel boring machines, is made of precast concrete segments. The use of steel fibers in this kind of support system can not only decrease production time and costs but also can improve compressive, tensile as well as flexural behaviors. A study has been carried out to examine the mechanical properties of segments in the Tabriz metro line-2 project using three types of steel fibers: 3D, 4D, and 5D. Various experiments were investigated to monitor the workability of Steel Fiber Reinforced Concrete (SFRC) under various loads. The results confirmed an improvement in the specimens’ mechanical properties because of these types of steel fibers. 5D, 4D, and 3D fibers provided the greatest effect on the tensile and flexural strength of steel fiber-reinforced concrete, respectively. The 28-day compressive, tensile, and flexural strengths of the specimens are incremented by 13%, 68%, and 154%, respectively. In addition, by conducting tests on the orientation of steel fibers, placing the fibers perpendicular to the load can improve the compressive strength of concrete by almost 18%. ; Sustav obloge koji se koristi u strojevima za bušenje tunela izrađen je od predgotovljenih betonskih segmenata. Upotreba čeličnih vlakana u ovoj vrsti potpornoga sustava ne samo da može smanjiti vrijeme i troškove proizvodnje, već također može poboljšati tlačna, vlačna i savojna svojstva. U ovoj studiji istražen je učinak triju vrsta (3D, 4D i 5D) čeličnih vlakana na mehanička svojstva segmenata u projektu linije 2 metroa Tabriz. U tu svrhu provedeni su pokusi tlačne, vlačne i savojne čvrstoće te test slijeganja. Rezultati su potvrdili poboljšanje mehaničkih svojstava uzoraka zbog prisutnosti ove vrste čeličnih vlakana, a također povećanjem sadržaja vlakana 28-dnevna tlačna, vlačna i savojna čvrstoća uzoraka povećava se za 13 %, 68 % odnosno 154 %. Osim toga, provođenjem ispitivanja orijentacije čeličnih vlakana utvrđeno je da se pomoću njih može povećati tlačna čvrstoća betona za oko 18 %, tako da postavljanje ...
EXPERIMENTAL INVESTIGATION OF STEEL FIBERS’ EFFECT ON THE IMPROVEMENT OF MECHANICAL PROPERTIES OF CONCRETE SEGMENTAL LINING IN MECHANIZED TUNNELING ; UTJECAJ ČELIČNIH VLAKANA NA POBOLJŠANJE MEHANIČKIH SVOJSTAVA BETONSKE SEGMENTNE OBLOGE
Chakeri, Hamid (author) / Darbor, Mohammad (author) / Maleki, Farid Sh. (author) / Minaee, Tohid (author)
2023-01-01
Rudarsko-geološko-naftni zbornik ; ISSN 0353-4529 (Print) ; ISSN 1849-0409 (Online) ; Volume 38 ; Issue 3
Article (Journal)
Electronic Resource
English
DDC:
690
Numerical investigation of hybrid segmental lining response to mechanized tunneling induced loadings
| UB Braunschweig | 2019