RESEARCH TO IMPROVE TUNNEL SUPPORT SYSTEMS
Studies are described that were directed toward improving the design of certain types of tunnel support systems. Studies to predict the interaction of a circular liner with the medium performed with a linear finite element computer program and a closed form solution are described. Two construction techniques that give different interaction solutions and thus different liner loadings were simulated. Results are presented in the form of dimensionless plots from which moment, thrust, shear and deformation can be predicted. Steel-fiber-reinforced regulated-set-cement concrete has been proposed for use in a slipformed tunnel liner system. Mix design, pumping characteristics and mechanical properties of this material are described. Also, test results for two specimens which represent a portion of the slipformed liner are presented. Behavior of the liner and resisting mechanism was found to be highly nonlinear and to have a great deal of reserve strength beyond the linear range. Eleven large-scale tests which simulate steel horse shoe sets in rock tunnels are described and the effects of connection characteristics, blocking stiffness, load distribution and load inclination on the set behavior are discussed. Both the concrete liners and the steel sets that were tested, were simulated by a linear (STRUDL) and a nonlinear analysis (NASTRAN) and the results compared with those obtained from the tests.
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University of Illinois, Urbana-ChampaignUrbana, IL United States 61801
- Paul, S L
- Kesler, C E
- GAYLORD, E H
- Mohraz, B
- HENDRON, A J
- Peck, R B
- Publication Date: 1974-6
- Features: Appendices; Figures; Photos; References; Tables;
- Pagination: 266 p.
- TRT Terms: Computer programs; Fibers; Reinforced concrete; Reinforcement (Engineering); Slip form pavers; Structural design; Testing; Tunnel supports; Tunnels
- Uncontrolled Terms: Tunnel design
- Old TRIS Terms: Liners; Slip forms
- Subject Areas: Bridges and other structures; Highways; Materials;
- Accession Number: 00264359
- Record Type: Publication
- ISBN: DOT FR 30022
- Report/Paper Numbers: FRA-ORD&D 74-51 Final Rpt.
- Files: TRIS
- Created Date: Jan 9 1975 12:00AM