The research article “Displacement monitoring, displacement verification and stability assessment of the critical sections of the Konak tunnel, İzmir, Turkey”, co-authored by METU member Prof. Haluk Akgün, has been published in Tunnelling and Underground Space Technology.
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 İzmir. 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 conglomerate) often intertongue with each other especially in the exit portal area. The accurate estimation of the shear strength and deformation parameters of these units is important for the displacement predictions and for the assessment of tunnel stability. Rock mass classification systems, namely, RMR, Q system and GSI have been employed to obtain the rock mass shear strength and deformation parameters along with performing empirical tunnel support design. Numerical analysis has been performed by using the finite element analysis for assessing tunnel support design and for predicting the vertical displacements at five different measurement points around the tunnel periphery and in the four geotechnical sectors of the tunnel. An evaluation of the results revealed that about 70% of the predicted displacements matched the measured displacements while only about 12.5% of the displacement predictions exceeded the measured displacements by more than about 50%. Moreover, it was observed that neither the support system elements nor the rock mass have yielded due to the redistribution of the stresses imposed by the disturbance related with the tunnel excavation.
Yertutanol, K., Akgün, H., & Sopacı, E. (2020). Displacement monitoring, displacement verification and stability assessment of the critical sections of the konak tunnel, izmir, turkey. Tunnelling and Underground Space Technology, 101 doi:10.1016/j.tust.2020.103357
Article access: https://www.sciencedirect.com/science/article/pii/S0886779819303037?via%3Dihub
Prof. Haluk Akgün |
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| hakgun@metu.edu.tr | Scopus Author ID: 7003587987 |
| About the author | ORCID: 0000-0003-0404-5647 |
Keywords:
Displacement monitoring; Numerical modeling; Rock mass; Rock mass classification; Tunneling; İzmir
Other authors:
Yertutanol K., & Sopacı E.
