The distribution of stresses and strains during the portal section excavation for the right tube of the Sleme Tunnel is analysed by the Finite Element Method (FEM). Results of analyses obtained using ...2D and 3D models have been compared to in-situ measurements of tunnel convergence and ground surface settlements. Multistage excavations with pipe roof support of the working face were modelled. The numerical models verified that for this particular case a sufficiently safe and cost-efficient construction technology was applied.
The distribution of stresses and strains during the portal section excavation for the right tube of the Sleme Tunnel is analysed by the Finite Element Method (FEM). Results of analyses obtained using ...2D and 3D models have been compared to in-situ measurements of tunnel convergence and ground surface settlements. Multistage excavations with pipe roof support of the working face were modelled. The numerical models verified that for this particular case a sufficiently safe and cost-efficient construction technology was applied.Original Abstract: Analizirano je stanja naprezanja i deformacija tijekom iskopa portable dionice desne cijevi tunela "Sleme" primjenom metode konacnih elemenata. Napravljena je usporedba rezultata proracuna ravninskog (2D) i prostornog (3D) modela s rezultatima terenskih mjerenja konvergencija u tunelu i slijeganja povrsine terena. Modelirani su visefazni iskopi s ojacanjem cela cijevnim krovom. Proracunski model je pokazao da je u navedenom slucaju primijenjena dovoljno sigurna i ekonomicna tehnologija iskopa.
Foreseeing of the rock massif behaviour in tunnel breaking out is a complex engineering problem. In projecting it is important to evaluate the stability conditions in excavation and after the ...acceptance of suitable breaking out methods, the acceptance of supporting in order to stabilize the opening. The New Austrian Tunnel Method (NATM) is the excavation method adaptable to frequent changes of geological and geotechnical conditions at the working face. Beside the excavation of the whole profile, excavations in soft materials along the tunnel trace condition, so called profile development, i. e. the application of multi-phase excavation. The conditions of stresses and strains for the whole-profile excavation are compared with the conditions of stresses and strains for starting stages of multi-phase excavations with the New Austrian Tunnel Method (the paper is published in Croatian).
Foreseeing of the rock massif behaviour in tunnel breaking out is a complex engineering problem. In projecting it is important to evaluate the stability conditions in excavation and after the ...acceptance of suitable breaking out methods, the acceptance of supporting in order to stabilize the opening. The New Austrian Tunnel Method (NATM) is the excavation method adaptable to frequent changes of geological and geotechnical conditions at the working face. Beside the excavation of the whole profile, excavations in soft materials along the tunnel trace condition, so called profile development, i. e. the application of multi-phase excavation. The conditions of stresses and strains for the whole-profile excavation are compared with the conditions of stresses and strains for starting stages of multi-phase excavations with the New Austrian Tunnel Method. PUBLICATION ABSTRACT
Analizirano je stanja naprezanja i deformacija tijekom iskopa portalne dionice desne cijevi tunela "Sleme" primjenom metode konačnih elemenata. Napravljena je usporedba rezultata proračuna ravninskog ...(2D) i prostornog (3D) modela s rezultatima terenskih mjerenja konvergencija u tunelu i slijeganja površine terena. Modelirani su višefazni iskopi s ojačanjem čela cijevnim krovom. Proračunski model je pokazao da je u navedenom slučaju primijenjena dovoljno sigurna i ekonomična tehnologija iskopa.
NAPREZANJA PRI VIŠEFAZNOM ISKOPU TUNELA Frgić, Lidija; Tor, Krešimir; Hrestak, Tomislav
Rudarsko-geološko-naftni zbornik,
12/2003, Letnik:
15, Številka:
1
Web Resource
Odprti dostop
Predviđanje odziva stijenskog masiva prilikom proboja tunela složen je inženjerski problem. Pri projektiranju važno je ocjenjivanje uvjeta stabilnosti iskopa, te nakon usvajanja prikladnih metoda ...probijanja, usvajanje odgovarajućih mjera podgrađivanja u svrhu stabilizacije otvora.Nova austrijska tunelska metoda (NATM) je metoda iskopa prilagodljiva čestim promjenama geoloških i geotehničkih uvjeta na čelu iskopa. Osim iskopa cijelog profila, iskopi u slabim materijalima duž trase tunela uvjetuju tzv. razradu profila tj. primjenu višefaznog iskopa. U radu je dana usporedba stanja naprezanja i deformacija za punoprofilni iskop sa stanjem naprezanja i deformacija pri razradi profila tj. za početne faze višefaznih iskopa NATM.
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