Stability analysis, displacement monitoring and justification of the critical sections of the Konak tunnel

Download
2015
Yertutanol, Kadir
The main focus of this research is numerical analysis and preliminary support design for the critical sections of the twin tube Konak Tunnel that was constructed in a highly populated area in Konak, İzmir. The displacements of the tunnel were monitored and justified by comparing with the results of the numerical analyses. The stability of the tunnel exit portal and associated slopes, which is one of the most challenging sections of the project, was analyzed as well. In study area, volcanics, pyroclastics and some sedimentary deposits (sandstone, mudstone and conglomerate) often intertongue with each other especially in the exit portal area. The accurate determination of the shear strength and deformation parameters of these units is important for the assessment of portal slope stability and support design and displacement predictions in the tunnel design. Rock mass classification systems, namely, RMR, Q system and GSI, have been employed to obtain the rock mass shear strength and deformation parameters. Stress analysis around the tunnel openings has been done through employing 2D finite element analysis for inspecting the tunnel support design and the vertical displacement in the critical sections and five different measurement points. The results of the finite element analysis have been controlled and correlated with the results of monitored vertical displacements. Consequently, when the monitoring points on the critical sections are evaluated individually, 70 % of the points ensure the predicted displacement limits and only 12.5 % of the displacements mismatch ratio is higher than the 50 %. Moreover both the support system elements and the rock

Suggestions

Determination of tunnel support systems of Belkahve (İzmir) tunnel with empirical and numerical methods
Domaniç, Can Murat; Topal, Tamer; Department of Geological Engineering (2016)
In this study, determining the geological and geotechnical characteristics of the Belkhave tunnel with a length of 1650 m and width of 16 m along Manisa-İzmir Highway, selecting the appropriate support system and verifying with numerical modeling are aimed. Limestone and schist are the main lithologies along the Belkahve tunnel. RMR, Q and NATM classification systems are used to classify the rock mass. Appropriate support systems are determined by using these classification methods. In order to verify the d...
Displacement monitoring, displacement verification and stability assessment of the critical sections of the Konak tunnel, Izmir, Turkey
Yertutanol, Kadir; Akgün, Haluk; Sopaci, Evrim (Elsevier BV, 2020-07-01)
The main focus of this study is vertical displacement monitoring and verification along with preliminary support design for the four geotechnical sectors of the twin tube Konak tunnel that was constructed in a highly populated area in Izmir. The displacements of the tunnel that were obtained through numerical analysis were verified by comparing them with the displacements obtained by construction monitoring. In the study area, volcanics, pyroclastics and some sedimentary deposits (sandstone, mudstone and co...
Metaheuristic based backcalculation of rock mass parameters around tunnels
Gedik, Görkem; Pekcan, Onur; Department of Civil Engineering (2018)
Due to uncertainities in the ground conditions and the complexity of soil-structure interactions, the determination of accurate ground parameters, which are not only used in tunnel construction but in the design of all underground structures, have a great significance in having structures that are cost-efficient. Backcalculation methods which rely not only on laborotory and field tests but also on field monitoring and field data provide real structure conditions and therefore it is gaining popularity in geo...
Comparison of deformations from 2d and 3d fem analysis with field measurements of a top down deep excavation in bağcilar metro station
Ustaoğlu, Abdullah Onur; Çokça, Erdal; Department of Civil Engineering (2015)
In this thesis, 2D and 3D FEM analysis results are compared with field measurements of a top down deep excavation in Bağcılar Metro Station which is on the Otogar - Bağcılar Light Rail Transit Line in İstanbul. First, a literature review on deep excavations is performed. The soil formation observed in the project site is Güngören formation and the dominant soil type is silty clay. After selecting the soil parameters and soil models, 2D and 3D models of the excavation are analyzed by FEM programs PLAXIS2D an...
Geotechnical investigations and preliminary support design for the Gecilmez tunnel: A case study along the Black Sea coastal highway, Giresun, northern Turkey
Akgün, Haluk; Kockar, Mustafa Kerem (2014-02-01)
This study encompasses geotechnical investigations, stability assessments and design of the preliminary support systems for the Gecilmez tunnel which is constructed in Giresun for the improvement of the highway along the Black Sea coast. During the study, a detailed geological map of the study area was prepared and the geotechnical characteristics of the rock masses were determined. The rock mass classification of the tunnel grounds was performed by utilizing the RMR method, Q system, NATM and the Geologica...
Citation Formats
K. Yertutanol, “Stability analysis, displacement monitoring and justification of the critical sections of the Konak tunnel,” M.S. - Master of Science, Middle East Technical University, 2015.