Browsing by Author "Starjakob, Franz"

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Access status: Open Access ,
Interdisciplinary aspects of tunnel design
(2007) Pöttler, Rudolf; Starjakob, Franz; Sysik, Paweł
When taking all aspects (geology, environment, geotechnics, safety, traffic aspects, ventilation, economic aspects, operational aspects) into account tunneling is a very complex design task. It is to be understood that the whole is more than the sum of its parts, and requires an interdisciplinary design process. The paper will deal in the first chapter with the success factors necessary for the interdisciplinary design and layout of high-speed railway tunnels. ILF carries out complex tunnel projects using its in-house capacity. Examples of how different aspects influence each other will be given with the high-speed railway tunnels in Germany and Austria.
Access status: Open Access ,
Tunneling through highly squeezing ground - a case history
(Wydawnictwa AGH, 2005) Pöttler, Rudolf; Starjakob, Franz; Spöndlin, Daniel
The adaptability of the New Austrian Tunneling Method in design and construction has been proven once more at the Strenger Tunnel, where highly squeezing rock mass caused considerably high deformations and loadings of the primary and secondary lining. By adjusting the support measures especially rock bolting and yielding steel elements installed in slots of the shotcrete lining large deformations up to 0.5 m due to progressive fracturing could be successfully mastered. Calculations using FE-models have been found to be helpful for decision making on site and therefore should increasingly by used in future. Calculations also showed that asymmetric rock mass behavior is not necessarily decisive for the loading of the inner concrete lining in case of extensive fracture processes. Thereby the general practice used in Austria to employ an unreinforced concrete lining was verified. For this decision it was considered that the shotcrete lining which undergoes repair works at the most critical sections will not completely fail but keep apart of its load bearing capacity with respect to normal forces.