Verification of empirically determined support systems of the Kılıçlar highway tunnel by numerical modelling

Çelik, Gözde
The aim of this study is to determine the geological and geotechnical characteristics of Kılıçlar Tunnel on Ankara-Kırıkkale Highway, to suggest the appropriate support and excavation systems and verify these suggested support systems via numerical modeling. The length of Kılıçlar Tunnel is 1110 m. The width of tunnel is 16 m, the height is 10 m and the maximum overburden height is 90 m. Since Ankara-Kırıkkale Highway consists of 2x3 lanes, the tunnel is designed as a twin tube tunnel. Kılıçlar Tunnel is planned to be excavated in Gabbro-Diabase and Serpentinite named as Artova Ophiolite Complex. The rock mass is classified by using RMR, Q and NATM classification systems and support systems are determined by using these classification methods. In addition to empirical approaches, 2D finite element analyses are conducted to check the stabilities of seven sections through the tunnel. Results of those analyses pointed out that the support materials determined empirically (4-6 m long bolt with intervals of 1-2 m, 10-20 cm shotcrete, steel sets (wherever required)) are compatible with those recommended after numerical modelling (4-5 m long bolt with intervals of 1.5-2.0 m, 10-20 cm shotcrete, steel sets for entrance and exit sections). Furthermore, the stabilities of the tunnel portals are also studied by numerical analyses and limit equilibrium analyses. Based on the stability analyses performed for both portals, no slope failure is expected at cut slopes with 1H/3V for forehead and for 1H/2V for side slope.


Evaluation of twin tunnel-induced surface ground deformation by empirical and numerical analyses (NATM part of Eurasia tunnel, Turkey)
Agbay, Ebru; Topal, Tamer (2020-03-01)
Pre-support systems are very important for inner-city shallow tunnels in order to minimize twin tunnel-induced surface deformations. However, previous studies concerning the assessment of the magnitude of surface displacements caused by twin tunneling have not considered the effects of a pre-support system and stress release by deformation. The aim of this study is to introduce a procedure for obtaining modification factor including the effects of a pre-support system and the rock mass quality that can be u...
Flow characterization study and fire experiments in a reduced scaled tunnel
Abuaisheh, Majd Basil Abdel Muhsen; Yozgatlıgil, Ahmet; Pınarcıoğlu, Mehmet Melih; Department of Mechanical Engineering (2019)
This work is an experimental study on the subject of tunnel fires, which is conducted on a ventilated 1/13 scaled tunnel model in the Fluid Mechanics Laboratory, Department of Mechanical Engineering of Middle East Technical University. In order to perform the experiments, in the first stage, the tunnel model was completely renovated, and its overall condition was improved to obtain better means of control and accuracy on the experimental measurements. In the second stage of the thesis, a flow characterizati...
Design of a traverse system for the characterization of a large-scale wind tunnel
Ulu, Tunahan; Perçin, Mustafa; Department of Aerospace Engineering (2022-9)
This study presents the design and simulations of a traverse system and preliminary characterization measurements of the RÜZGEM large-scale wind tunnel. In the first phase of the study, the traverse system was simulated aerodynamically using computational fluid dynamics (CFD) tools. The effects of the rectangular, whole profile and partial profile traverse mechanisms on the measurements were examined. The probe lengths were studied in detail to determine the most suitable length. According to the simulation...
Engineering geological investigations along the Iliksu Tunnels, Alanya, southern turkey
Koçkar, Mustafa Kerem; Akgün, Haluk (Elsevier BV, 2003-03-01)
The main objective of this study is to assess the engineering geological characteristics of the rock mass and to suggest appropriate support recommendations along the two autoroad tunnel projects, named as Iliksu 1 and lliksu 2, which are located along the Antalya-Alanya Highway. The study area consists of pelitic schist and calc schist overlain by a thick sequence of recrystallized limestone and an intercalation of pelitic schist, calc schist and graphite schist. The tunnel ground support types and categor...
Assessment of tunnel induced deformation field through 3-dimensional numerical models (Necatibey subway station, Ankara, Turkey)
Aktürk, Özgür; Doyuran, Vedat; Department of Geological Engineering (2010)
In heavily settled areas, deformations induced by the tunnel excavation may cause serious damage to nearby structures. In this study it is aimed to model ground deformations induced by main tunnels and connection tunnels excavations as well as groundwater drainage. Therefore, it is necessary to study effective means of controlling tunnel induced deformations. The main parameters affecting the failure and deformation state of the soil around a circular underground opening are the physical characteristics of ...
Citation Formats
G. Çelik, “Verification of empirically determined support systems of the Kılıçlar highway tunnel by numerical modelling,” M.S. - Master of Science, Middle East Technical University, 2011.