Numerično modeliranje gradnje predorov v anizotropnih mehkih skrilavih kamninah

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Language:	Slovenian
Year of publishing:	2009
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FGG - Faculty of Civil and Geodetic Engineering
Publisher:	[J. Markovič]
UDC:	519.61/.64:624.19(043.2)
COBISS:	4578145
Views:	1808
Downloads:	505
Average score:	0 (0 votes)
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Secondary language:	English
Secondary title:	Numerical modelling of tunnel construction in anisotropic foliated soft rock
Secondary abstract:	The present work focuses on the influence on tunnelling in the anisotropic foliated soft rock. The excavation initiates stress redistribution around an opening and thus causes the deformation to occur. The numerical problem of the tunnel excavation was modelled in the Plaxis 2D code using different soil constitutive models for modelling the rock mass behaviour. A parametric study was performed to obtain the model response to alteration of the rock mass parameters. The analysis was divided into two parts. An influence of the excavation of the tunnel in the anisotropic foliated soft rock on the deformation of the surface above the tunnel was studied in the first part. Further on the influence of the foliation on the deformation pattern of the tunnel circumference was analysed. The results indicated that the anisotropic material model with low shear stiffness along foliated soft rock is closed to the actual response of rock mass. Using results from parametric study different cases from the three recently constructed tunnels (Šentvid, Trojane and Golovec) in the foliated soft rock were analysed. Calculation results with obtained low shear stiffness parameter match the measured response in case of the Šentvid tunnel and Golovec tunnel. Not the same parameters gave match for the Trojane tunnel, where a higher shear modulus and slightly lower elastic
Secondary keywords:	graduation thesis;civil engineering;anisotropy;foliated soft rock mass;constitutive material model;shear module;
File type:	application/pdf
Type (COBISS):	Undergraduate thesis
Thesis comment:	Univ. Ljubljana, Fakulteta za gradbeništvo in geodezijo
Pages:	XIII, 85 str.
Type (ePrints):	thesis
Title (ePrints):	Numerical modelling of tunnel construction in anisotropic foliated soft rock
Keywords (ePrints):	anizotropija;mehke skrilave kamnine;konstitutivni materialni model;strižni modul
Keywords (ePrints, secondary language):	anisotropy;foliated soft rock mass;constitutive material model;shear module
Abstract (ePrints):	V diplomski nalogi je obravnavan vpliv anizotropije tal v mehkih skrilavih kamninah, kjer zaradi gradnje predora pride do spremembe napetostnega stanja in posledično do spremembe deformacij. Problem smo numerično reševali s programom Plaxis 2D, kjer smo uporabili različne konstitutivne materialne modele, s katerimi definiramo odziv temeljnih tal. Izvedli smo parametrično analizo, da smo lahko spoznali, kako posamezni parameter vpliva na obnašanje hribinske mase med gradnjo predora. Analiza je bila razdeljena na dva dela. V prvem delu smo izvedli analizo vpliva gradnje predora v anizotropnih mehkih skrilavih kamninah na pomike na površju nad predorsko cevjo, v drugem pa analizo vpliva na pomike v predorski cevi. Na podlagi tega smo ugotovili, da se lahko z uporabo anizotropnega materialnega modela, z nizkim striţnim modulom materiala vzdolţ skrilavosti zelo dobro pribliţamo dejanskemu odzivu hribinske mase. V nadaljevanju smo v povratni analizi obravnavali tri primere predorov: Šentvid, Trojane in Golovec. Ugotovili smo, da je na eni strani uporaba nizkega striţnega modula za predora Šentvid in Golovec v anizotropnem materialnem modelu, v programu Plaxis 2D primerna in dobra v primerjavi z meritvami. Na drugi strani pa za predor Trojane velja uporabiti višji striţni modul in nekoliko niţje elastične
Abstract (ePrints, secondary language):	The present work focuses on the influence on tunnelling in the anisotropic foliated soft rock. The excavation initiates stress redistribution around an opening and thus causes the deformation to occur. The numerical problem of the tunnel excavation was modelled in the Plaxis 2D code using different soil constitutive models for modelling the rock mass behaviour. A parametric study was performed to obtain the model response to alteration of the rock mass parameters. The analysis was divided into two parts. An influence of the excavation of the tunnel in the anisotropic foliated soft rock on the deformation of the surface above the tunnel was studied in the first part. Further on the influence of the foliation on the deformation pattern of the tunnel circumference was analysed. The results indicated that the anisotropic material model with low shear stiffness along foliated soft rock is closed to the actual response of rock mass. Using results from parametric study different cases from the three recently constructed tunnels (Šentvid, Trojane and Golovec) in the foliated soft rock were analysed. Calculation results with obtained low shear stiffness parameter match the measured response in case of the Šentvid tunnel and Golovec tunnel. Not the same parameters gave match for the Trojane tunnel, where a higher shear modulus and slightly lower elastic
Keywords (ePrints, secondary language):	anisotropy;foliated soft rock mass;constitutive material model;shear module
ID:	8309920