Pomen zgodnje trdnosti mikroarmiranih brizganih betonov pri projektiranju betonskih oblog predorov

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Language:	Slovenian
Year of publishing:	2010
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FGG - Faculty of Civil and Geodetic Engineering
Publisher:	[G. Rajh]
UDC:	624.019:691.32(043.2)
COBISS:	4897121
Views:	1618
Downloads:	438
Average score:	0 (0 votes)
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Secondary language:	English
Secondary title:	ǂThe ǂsignificance of steel fibre reinforced shotcrete's early strenght on tunnel concrete lining design
Secondary abstract:	The present work is divided in an introduction, four substantive chapters and conclusions. The first substantive chapter represents concrete in general – its history, basic components, as well as mechanical and other physical characteristics. Fibre reinforced concrete is presented next, followed by a brief history of adding fibres to materials and a description of concrete depending on the type of fibres used. Shotcrete and its dry and wet process of application is described at the end of the chapter. Second chapter focuses on the measurements of ultimate uniaxial compressive strenght of young steel fibre reinforced shotcrete, based on the test method recomended by RILEM. Test program consisted of three mixtures with different fibre content. Tests were performed on specimens after a period of 1, 2, 4, 8 and 12 hours. Specimens aged 1, 2, 3, 7 and 28 days were only tested for the ultimate compression strength. The data obtained this way leads to the fourth substantive chapter. The main principles of the NATM method are presented in chapter three together with the Dekani tunnel, as an example of successful application of steel fibre reinforced shotcrete. The last chapter contains parametric study, carried out to see how different contents of steel fibres in the mixture influence on tunnel excavation speed (at a constant thickness of shotcrete lining). Study was based on data gathered during the construction of a new tunnel Ljubno tube on the highway section Peračica – Podtabor (Ljubljana – Jesenice). This tunnel was built according to the principles of the new Austrian tunneling method (NATM). Conclusions are presented at the end.
Secondary keywords:	civil engineering;graduation thesis;fibre reinforced shotcrete;early strength;primary tunnel lining;support measures;
File type:	application/pdf
Type (COBISS):	Undergraduate thesis
Thesis comment:	Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Pages:	XIV, 79 str.
Type (ePrints):	thesis
Title (ePrints):	The significance of steel fibre reinforced shotcrete’s early strength on tunnel concrete lining design
Keywords (ePrints):	mikroarmirani brizgani beton;zgodnje trdnosti;primarna obloga predora;podporni ukrepi
Keywords (ePrints, secondary language):	fibre reinforced shotcrete;early strength;primary tunnel lining;support measures
Abstract (ePrints):	Diplomsko delo je razdeljeno na uvod, štiri vsebinska poglavja in zaključke. V prvem vsebinskem poglavju je predstavljena zgodovina betona, opisane so še njegove sestavine ter mehanske in druge fizikalne lastnosti. Sledi mikroarmirani beton, zgodovina uporabe vlaken za ojačevanje materialov in opis različnih vrst mikroarmiranih betonov glede na vrsto uporabljenih vlaken. Na koncu poglavja je opisan brizgani beton in dva postopka njegovega nanašanja (suhi, mokri). Naslednje poglavje prikazuje preiskavo obnašanja mladega mikroarmiranega brizganega betona pod enoosno tlačno obremenitvijo po metodi, ki jo priporoča RILEM. Program preskušanja je obsegal tri sestave betona, ki so se med seboj razlikovale samo po količini vsebovanih jeklenih vlaken. Preiskave po zgoraj navedeni metodi so bile izvedene pri starostih betona 1, 2, 4, 8 in 12 ur. Na vzorcih, starih 1, 2, 3, 7 in 28 dni, pa je bila določena samo največja tlačna trdnost. Podatki, dobljeni na ta način, so bili podlaga za četrto vsebinsko poglavje. V tretjem vsebinskem poglavju so predstavljene bistvene značilnosti metode NATM in primer uspešne uporabe mikroarmiranega brizganega betona pri gradnji predora Dekani. V zadnjem vsebinskem poglavju je predstavljena parametrična študija vpliva različne količine v betonu vsebovanih vlaken na dolžino izkopa in primarnega podpiranja (ob konstantni debelini obloge) predora. Osnova za študijo so bili podatki, zbrani med gradnjo novega predora Ljubno na AC odseku Peračica – Podtabor (Ljubljana – Jesenice). Ta je bil grajen skladno z načeli, ki jih narekuje nova avstrijska predorska metoda (NATM). Na koncu diplomskega dela so zbrani zaključki.
Abstract (ePrints, secondary language):	The present work is divided in an introduction, four substantive chapters and conclusions. The first substantive chapter represents concrete in general – its history, basic components, as well as mechanical and other physical characteristics. Fibre reinforced concrete is presented next, followed by a brief history of adding fibres to materials and a description of concrete depending on the type of fibres used. Shotcrete and its dry and wet process of application is described at the end of the chapter. Second chapter focuses on the measurements of ultimate uniaxial compressive strenght of young steel fibre reinforced shotcrete, based on the test method recomended by RILEM. Test program consisted of three mixtures with different fibre content. Tests were performed on specimens after a period of 1, 2, 4, 8 and 12 hours. Specimens aged 1, 2, 3, 7 and 28 days were only tested for the ultimate compression strength. The data obtained this way leads to the fourth substantive chapter. The main principles of the NATM method are presented in chapter three together with the Dekani tunnel, as an example of successful application of steel fibre reinforced shotcrete. The last chapter contains parametric study, carried out to see how different contents of steel fibres in the mixture influence on tunnel excavation speed (at a constant thickness of shotcrete lining). Study was based on data gathered during the construction of a new tunnel Ljubno tube on the highway section Peračica – Podtabor (Ljubljana – Jesenice). This tunnel was built according to the principles of the new Austrian tunneling method (NATM). Conclusions are presented at the end.
Keywords (ePrints, secondary language):	fibre reinforced shotcrete;early strength;primary tunnel lining;support measures
ID:	8310643