720 KB12 KB200320222004Dervarič, EvgenLikar, JakobMerhar, Braneštevilka:4letnik:51str. 2109-2115COBISSID:130011ISSN:1408-7073URN:URN:NBN:SI:doc-ZSV2BFVPenInštitut za rudarstvo, geotehnologijo in okoljeNaravoslovnotehniška fakultetaRMZ-materials and geoenvironmentcivil engineeringgeologijageologygeotehnologijagradbeništvoreološke lastnostitlaTrojanetuneliSome tunnel construction sequences in carboniferous soft rocks analysed by rheological model|The usage of underground structures is increasing which is the reason that in many cases construction takes place in heavy geological geotechnical conditions. Due to this, the appropriate constitutive equations describing the time dependent reactions of the rocks with signification rheological properties, is necessarily to be applied. The excavation of the tunnel Trojanehad run through distinctive rheological rocks with variable geotechnical properties. The construction process was modelled with PLAXIS 3D tunnel program. Input parameters were determined by 3D back analysis with Soft-Soil-Creep (SSC) constitutive material model, which takes into account rheological phenomena. 3D development of stress-strain fields during the tunnel excavation was performed to show major stress-strain changes in the surrounding rocks and support elements. Analyses with SSC material model was also made to show how the excavation of the top heading influences on development of deformations ahead of excavation. The calculations showed that during excavation of the top heading substantial deformations are developed ahead of the top heading. Good agreement between measurement and calculated movements were obtainedTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Naravoslovnotehniška fakulteta