Experimental investigation of pressurized concrete tunnel linings

Download

index.pdf

Date

2019

Author

Kalaycıoğlu, Münci Tunç

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

174
views

125
downloads

Behaviour of pressurized tunnels are determined by the mechanical and geometrical properties of lining, mechanical properties and overburden pressure, and the quality of contact zone between rock and lining. These factors form the backbone of the designprocessoftunnelswithinternalpressure. Estimatingcrackwidthsanddamage patternsischallengingdueto thenonlinearinteractionofnaturalandartiﬁciallayers. Inthisstudy,inﬂuenceofkeyparametersandFRP-fabric-wraprepairingmethodwere experimentally investigated. Eight specimens which were %40-scaled replicas of typical cross-section used in Topçam Dam, a reinforced concrete tunnel built into weak rock were tested. 1)No conﬁnement, 2)No conﬁnement ﬁber reinforced concrete, 3)Low conﬁnement (rock present) 4)High conﬁnement (stressed rock), 5)High conﬁnement and imperfect contact, 6)FRP-repaired high conﬁnement imperfect contact, 7)High conﬁnement and imperfect contact with FRC, and 8)High conﬁnement and improved contact. Mechanical properties of weak rock was simulated with a special light weight concrete composite. Loading of the specimens was done by applying pressure in two orthogonal directions with hydraulic jacks and pressure transmitting sections. Experimental data collection was conﬁrmed with digital image correlation results. The study demonstrated the behaviour of horse-shoe shaped pressurized tunnels using a novel experimental approach, a ﬁrst in the literature, with the key variables of: in-situ state of stress, contact of lining and mechanical properties of lining. Results showed that the level of conﬁnement strongly affects the behaviour, sofﬁt voids are critical and infringe the assumption of continuous load distribution, FRC does not improve the capacity of the section but distribute crack locations and control crack widths.

Subject Keywords

Tunneling., Tunnel, Pressurized Tunnels, Experimental Investigation, Contact, Weak Rock Tunneling, DIC.

URI

http://etd.lib.metu.edu.tr/upload/12623552/index.pdf
https://hdl.handle.net/11511/44382

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

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...
Experimental investigation of the effects of different helicopter rotor tip geometries on aerodynamic performance and tip vortex characteristics Uluocak, Sinem; Hazaveh, Hooman Amiri; Perçin, Mustafa; Akpolat, M Tuğrul; Uzol, Oğuz (Netherlands Association of Aeronautical Engineers; 2018-09-05) In this study, the effects of different tip geometries (rectangular, anhedral, swept-tapered and swept-tapered-anhedral) on the rotor hover performance and tip vortex characteristics are investigated experimentally. A scaled rotor model set-up, instrumented with thrust and torque sensors, is used for aerodynamic performance measurements in hover and a two-dimensional (2D) particle image velocimetry (PIV) is used to obtain the tip vortex characteristics such as vortex trajectory, maximum tangential velocity,...
Experimental Determination of Resistance Characteristics of Support Details Used in Prestressed Concrete Bridge Girders Baran, Eray; French, Catherine; Schultz, Arturo (American Society of Civil Engineers (ASCE), 2009-09-01) Static load tests were performed on support details used at the ends of prestressed concrete pedestrian bridge girders to determine the resistance characteristics of girder supports in the direction perpendicular to the longitudinal axis of the girders. The specimens tested represent support details that have also been widely used in prestressed concrete highway bridges in Minnesota and in other states. Two specimens, one representing the free-end detail and one representing the restrained-end detail were s...
EXPERIMENTAL INVESTIGATION OF HEAT TRANSFER AND PRESSURE DROP OVER RECTANGULAR PROFILE FINS PLACED IN A SQUARE CHANNEL Aylı, Ece; Kıyıcı, Fırat; Bayer, Özgür; ARADAĞ ÇELEBİOĞLU, SELİN (2014-06-19) In this study, with the help of a fan, fully developed turbulent flow conditions are experimentally obtained to investigate the heat transfer and pressure drop characteristics of rectangular fins. Fins with different geometries are placed to the bottom surface of a square shaped channel. Finned test pieces are heated by constant heat flux and other parts are kept as well insulated. The effect of fin height to the heat transfer coefficient is investigated by performing experiments. Temperature distributions,...
COMPRESSIBLE, HYPERELASTIC, SPINNING TUBES SUBJECTED TO RADIAL PRESSURE ERTEPINAR, A (1991-01-01) The theory of finite elasticity is used to investigate the behaviour of cylindrical tubes made of compressible, hyperelastic materials and subjected to the simultaneous action of spin and radial tractions on the outer curved surface while the inner curved surface is perfectly bonded to a rigid shaft. The second order quasi-linear ordinary differential equation governing the system is solved numerically by the method of adjoints. The effects of the material compressibility, the second strain invariant depe...

Citation Formats

M. T. Kalaycıoğlu, “Experimental investigation of pressurized concrete tunnel linings,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Civil Engineering., Middle East Technical University, 2019.