ODABIRANJE DIMENZIJA PODGRADA PODZEMNIH PROSTORIJA
Item
Title (Dublin Core)
hrv
ODABIRANJE DIMENZIJA PODGRADA PODZEMNIH PROSTORIJA
eng
THE ULTIMATE STATE CONCEPT APPLIED TO TUNNEL SUPPORT
Description (Dublin Core)
hrv
Iz kritičkog osvrta na uobičajeni način proračuna interakcije stijene i podgradc slijedi da proračun podgradc koji se temelji na njihovim zajedničkim deformacijama nije pouzdan. Ako se, nakon šo je ugrađena podgrada, deformacije stijene povećavaju (»konvergenci¬ja«), će biti neminovno opterećena do njezine granične nosivosti. Budući da je takvo granično opterećenje vjerojatno predlaže se inver-zan postupak, tj. umjesto da se podgrada optereti aktivnim tlakom stijene ili tla, opterećuje se stijena mogućim reaktivnim tlakom pod-grade. Proračun reaktivnog tlaka slijedi iz odabranih dimenzija pod¬gradc; debljine luka, njegovog radijusa, te čvrstoće betona i eventualne armature luka. Takvo opterećenje stijene prouzrokuje stanje napre¬zanja, koje se mora kontrolirati jednim od kriterija loma stijene. Ako stijena opterećena reaktivnim tlakom i odabrane podgradc zadovolja¬va kriterij loma znači da su dimenzije podgradc adekvatne. Iterativnim postupkom mijenjanja debljine luka podgradc i njegovog geome¬trijskog oblika mogu se naći dimenzije podgradc koje osiguravaju stabilnost stijene sa zadanim kriterijem loma. Kod proračuna granice nosivosti podgradc i kriterija loma stijene primjenjuje se pravila Euro-koda 7 za geotehničke konstrukcije.
eng
The most questionable are the values of pressures between rock and support resulting from common deformations on the contact area between rock and support. Therefore the modelling and design of the tunnel support is not reliable, if it is based on active rock pressure resulting from this common deformations. The inversion of the design procedure is proposed. Instead of the active extreme pressure of the rock on support, the influence of ultimate reaction of the support on the rock has to be analysed. This procedure can be performed using the ultimate load principle, as proposed by Eurocodc 7 (Geotechnies). Normally, the rock has the tendency to increase the common conver¬gence until the support reaches its ultimate state. So, loading of profile boundary with the ultimate possible reaction of the support is very plausible. The reactive support pressures have to be probable and itself in equilibrium. The ultimate reactive load has to be reduced by Euro-code safety factor for structural elements and applied on the rock with given properties, or alternatively (as proposed by Eurocode 7) the soil or rock properties have to be diminished and calculated with full ultimate support pressures. If the rock with given (or proposed) pro¬perties and loaded with ultimate reactive pressures resulting from supposed support, satisfy its failure criterion, then is the compound system support-rock verificatcd. By this procedure, the number of relevant material properties is reduce to the primary stress ratio and the constants defining the failure criterion. The verification can be performed by any of numerical methods, but we prefer here used boundary elements method.
Creator (Dublin Core)
Hudec, Mladen
Frgić, Lidija
Tor, Krešimir
Subject (Dublin Core)
hrv
tunel;podzemne prostorije;mehanika stijena;podgrada;dimenzioniranje podgrade
eng
tunnel;underground rooms;rock mechanics;support design;rock-support interaction
Publisher (Dublin Core)
Faculty of Mining, Geology and Petroleum Engineering University of Zagreb
Date (Dublin Core)
2000
Type (Dublin Core)
text
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
https://hrcak.srce.hr/13423
hrv
https://hrcak.srce.hr/file/20582
Source (Dublin Core)
Rudarsko-geološko-naftni zbornik
ISSN 1849-0409 (Online)
Volume 12
Issue 1
Language (Dublin Core)
hrv
Rights (Dublin Core)
info:eu-repo/semantics/openAccess
The author and publisher rights are visible during the submission process, and ethical codex is available at http://hrcak.srce.hr/ojs/index.php/rgn/about/editorialPolicies#custom-0 .
The Bulletin is open access (OA, green model, CC-BY) journal what means that electronic versions of articles are accessible to readers, without any fees or registration.When use, please refer to Creative Commons license (BY type, http://creativecommons.org/licenses/by/4.0/ ).
Publisher copyright policies & self-archiving is also described at Sherpa organisation web (RoMEO service) based at the University of Nottingham (http://www.sherpa.ac.uk/romeo/pub/2374/).
All volumes of the Bulletin (from 1989) are available at Hrčak journal pages (http://hrcak.srce.hr/rgn-zbornik?lang=en).
The Bulletin is open access (OA, green model, CC-BY) journal what means that electronic versions of articles are accessible to readers, without any fees or registration.When use, please refer to Creative Commons license (BY type, http://creativecommons.org/licenses/by/4.0/ ).
Publisher copyright policies & self-archiving is also described at Sherpa organisation web (RoMEO service) based at the University of Nottingham (http://www.sherpa.ac.uk/romeo/pub/2374/).
All volumes of the Bulletin (from 1989) are available at Hrčak journal pages (http://hrcak.srce.hr/rgn-zbornik?lang=en).