Experimental investigation of pressurized concrete tunnel linings

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2019

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Kalaycıoğlu, Münci Tunç

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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.

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

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Graduate School of Natural and Applied Sciences, Thesis

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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.