Συγκριτική αξιολόγηση τεχνικογεωλογικών συνθηκών σχεδιασμού και κατασκευής της σύραγγας Τ2 των Τεμπών

Περίληψη

This dissertation is concerned with the benchmarking of the geotechnical conditions of the design and construction of Tempi‘s T2 tunnel and also the examination of the behavior of poor and heterogenous rockmass in compressive environment. There were used data from the research and the construction of the T2 tunnel, as well as elements from the bibliography. The tunnel being studied penetrates crystalized limestones and phyllites with poor geotechnical characteristics. Firstly, the area‘s geology was examined according to the research‘s data and it was compared to the one that occurred from the tunnel‘s construction data. Afterwards, the formations are being approached by a geotechnical point of view and discrete geotechnical unities are being constructed with specific characteristics that are being compared to the research‘s ones. Then, the general hydrogeology of the area is being examined in relation with the T2 tunnel. Consequently, there was a research conducted on the behavior of the various geotechnical unities in the tunnel related to the estimation from the rockmass estimation diagram (Tunnel Behavior Chart, TBC) and from the estimations based on the research‘s data. Moreover, the software ―Unwedge‖ was used to find wedges based on discontinuity systems on crystalized limestone, with data from the research and from the construction‘s concessionaire. Finally, the software ―Phase2‖ was utilized for reverse analyses on metamorphic phyllites with very poor characteristics, which had shown inexpediency tendencies during the construction of T2 tunnel. The aim of the reverse analyses‘ conduction was to approach the inexpediency tendencies that were made and also the way the alternation between phyllites and crystalized limestones influenced the deformations.