Rock mass characterization and primary support design for the Boztepe Tunnel, Turkey

Sopaci, E.
Akgün, Haluk
Akinci, M.
The Ordu province in local scale and northeastern Turkey in regional scale comprise of volcanic arc related rock masses. These modes of origin accommodate both volcanic and flysch type rock masses that have transitions so often with each other. The Boztepe tunnel will mostly be driven through this type of lithol-ogy. In order to assess the rock masses surrounding the tunnel from a geotechnical point of view; surface, subsurface and laboratory investigations have been implemented. Internationally accepted rock mass classification systems (RMR, NGI-Q-system and GSI) have been utilized via information gathered mostly from surface geo-technical investigations. In an attempt to check the validity of the empirical tunnel supports, stress analyses around the tunnel openings have been executed through employing finite element analyses by the Phase 2 package program. Kinematical and limit equilibrium analyses of the tunnel portals have been employed for portal slope stability considerations.
2005 ITA-AITES World Tunnel Congress and 31st General Assembly, 7 May 2005 through 12 May


Portal slope stability assessment of a proposed highway tunnel in northeastern Turkey
Sopaci, E.; Akgün, Haluk (2009-01-01)
This paper presents an application of the rock mass classification systems, namely, Geomechanics Classification System (RMR), Geological Strength Index (GSI) and the newly adapted A-RMR for the characterization of the rock masses surrounding the portals of the Ordu Peripheral Highway Tunnel. In order to characterize the rock masses, which mainly consist of flysch (mostly alternation of sandstone, marl and siltstone) and pyroclastics (agglomerate and tuff), engineering geological investigations have been car...
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Nannoconids have been recorded in a rock-forming quantity in the uppermost Jurassic-Lower Cretaceous rock units in Northwest Anatolia, Turkey. Samples were collected from seventeen stratigraphic sections spanning the calciturbidities of the Yosunlukbayırı Formation and pelagic micrites of the Soğukçam Limestone. Because of rareness and difficulties for extracting of calcareous nannofossil species particularly zone markers in these type lithologies, nannoconids have particular attention in terms of biostrati...
Weathering and Excavation Effects on the Stability of Various Cut Slopes in Flysch-Like Deposits
Ersöz, Timur; Topal, Tamer (2018-12-01)
Cut slopes are very sensitive to weathering because of disturbed rock mass and topographical condition by excavation. During and right after an excavation process of a cut slope, weathering and erosion may act on this newly exposed rock material and mass. These acting on the rock may degrade and change its engineering properties and the stability of the cut slope in its engineering lifetime. In this study, weathering and excavation effects on stability of sixteen cut slopes in flysch-like deposits at North ...
Ellero, Alessandro; Ottria, Giuseppe; Sayıt, Kaan; Catanzariti, Rita; Frassi, Chiara; Göncüoğlu, Mehmet Cemal; Marroni, Michele; Pandolfi, Luca (2015-01-01)
In the Central Pontides (Northern Turkey), south of Tosya, a tectonic unit consisting of not-metamorphic volcanic rocks and overlying sedimentary succession is exposed inside a fault-bounded elongated block. It is restrained within a wide shear zone, where the Intra-Pontide suture zone, the Sakarya terrane and the Izmir-Ankara-Erzincan suture zone are juxtaposed as result of strike-slip activity of the North Anatolian shear zone. The volcanic rocks are mainly basalts and basaltic andesites (with their pyroc...
Tectono-metamorphic evolution of the northern Menderes Massif : Evidence from the horst between Gördes and Demirci Basins (west Anatolia, Turkey)
Buğdaycıoğlu, Çağrı; Bozkurt, Erdin; Department of Geological Engineering (2004)
The Menderes Massif forms a large metamorphic culmination in western Turkey ا an extensional province where continental lithosphere has been stretching following Palaeogene crustal thickening. Northern sector of the Massif on the horst between Gördes and Demirci Basins was chosen for structural analysis aimed to study the tectono-metamorphic evolution of the northern Menderes Massif. Within the study area, four groups of rocks are recognized: (1) the metamorphic rocks ا orthogneisses and metasediments; (2) ...
Citation Formats
E. Sopaci, H. Akgün, and M. Akinci, “Rock mass characterization and primary support design for the Boztepe Tunnel, Turkey,” Istanbul, Turkey, 2005, vol. 2, p. 141, Accessed: 00, 2021. [Online]. Available: