Evaluation of structural analysis methods used for the design of tbm segmental linings

Çimentepe, Ahmet Güray
Contrary to the linings of conventionally driven tunnels, the linings of tunnels bored by tunnel boring machines (TBMs) consist of precast concrete segments which are articulated or coupled at the longitudinal and circumferential joints. There are several analytical and numerical structural analysis methods proposed for the design of TBM segmental linings. In this thesis study, different calculation methods including elastic equation method and two dimensional (2D) and three dimensional (3D) beam – spring methods are compared and discussed. This study shows that in addition to the characteristics of concrete segments, the mechanical and geometrical properties of longitudinal and circumferential joints have significant effects on the structural behavior of segmental lining.


Assessment of twin tunnel induced ground deformation by empirical and numerical analyses (Eurasia tunnel: NATM part, Istanbul, Turkey)
Ağbay, Ebru; Topal, Tamer; Department of Geological Engineering (2019)
Pre-support systems become very important for inner-city shallow tunnels especially while applying New Austrian Tunneling Method (NATM) which requires some deformation to relieve the stress. Previous studies about assessing the magnitude of surface displacements caused by twin tunneling do not include the effects of presupport system and stress release by deformation. Moreover, most of the established empirical equations were obtained by using data from tunnel passing through clayey soil. Objective of this ...
Stability analysis, displacement monitoring and justification of the critical sections of the Konak tunnel
Yertutanol, Kadir; Akgün, Haluk; Department of Geological Engineering (2015)
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 an...
An experimental study to investigate the possibility of using macro-synthetic fibers in precast tunnel segments
Tengilimoğlu, Oğuz; Akyüz, Uğurhan; Department of Civil Engineering (2019)
With the development of tunnel construction techniques, segmental tunnel linings have begun to play a crucial role in preserving ground surfaces and solving traffic problems in metropolitan areas. In parallel with growing interest in precast tunnel lining, engineers are in the Search of solutions that improve precast production efficiency and obtain higher structural performance. Nonetheless, the number of studies related to precast tunnel segments in Turkey is quite limited. Fibers have used as reinforceme...
Modeling of ground-borne vibration from underground railway systems
Sarıgöl, Melih; Çalışkan, Mehmet; Department of Mechanical Engineering (2007)
Ground-borne vibration from underground rail vehicles is studied analytically. A previously developed model by J.A.Forrest and H.E.M.Hunt is modified to account for different track and vehicle models. The tunnel is modeled as infinite cylindrical shell surrounded by viscoelastic soil. The track is coupled to the tunnel with supports of complex stiffness. The rails, which are modeled as infinite Euler beams, are supported by discrete sleepers with regular spacing, and railpads with complex stiffness. A modif...
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...
Citation Formats
A. G. Çimentepe, “Evaluation of structural analysis methods used for the design of tbm segmental linings,” M.S. - Master of Science, Middle East Technical University, 2010.