Structural Behavior and Design Implications of Concrete Tunnel Linings Based on Model Tests and Parameter Studies
Sgouros, George Emmanuel
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https://hdl.handle.net/2142/69909
Description
Title
Structural Behavior and Design Implications of Concrete Tunnel Linings Based on Model Tests and Parameter Studies
Author(s)
Sgouros, George Emmanuel
Issue Date
1982
Department of Study
Civil Engineering
Discipline
Civil Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Civil
Abstract
The objective of this study was to investigate the structural behavior of concrete tunnel linings at ultimate and service loads (with the emphasis on subway tunnels), taking into account soil-structure interaction and the nonlinearity of the concrete. The conclusions drawn could serve as the basis for the formulation of rational design guidelines for concrete tunnel linings in a wide range of ground conditions.
The research consisted of an evaluation of concrete tunnel lining design practice in the United States, a series of model tests on arched and circular linings and the use of a finite element program to simulate the tests and to study the effects of the variation of certain parameters on full-scale linings.
On the basis of this study the following was concluded: The increase of the load capacity of the lining due to reinforcement was more pronounced for tunnels in soft ground than in rock. Results of the model tests indicated that reinforcement limits the size of cracks in the lining. Model tests and parameter study results showed that increasing or preserving the stiffness of the ground was the most effective way to improve the performance of the lining.
Triangularly shaped loads concentrated over the crown of the lining result in the highest moments and also in the lowest ultimate load of any of the load shapes examined for arched openings in rock. However, the uniform load across the width of the arch gives the lowest safety factor against failure.
The tangential shear between lining and rock is an important parameter in trying to improve the load capacity of linings in rock. Parameter studies indicated that the equivalent stiffness of a segmented lining lies between 30 to 95 percent of that of a monolithic lining of the same thickness.
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