Geo-Congress 2020
Physical Modeling of Lined Tunnel in Squeezing Ground Conditions
Publication: Geo-Congress 2020: Engineering, Monitoring, and Management of Geotechnical Infrastructure (GSP 316)
ABSTRACT
In tunnels excavated in squeezing ground conditions, the excess rock pressure may cause failure of the tunnel lining leading to substantial rock deformation. The increase in rock pressure and deformation may be time-dependent, indicating that creep plays an important role. This paper presents a three-dimensional physical model of a lined tunnel subjected to true-triaxial stress state. The model material is a synthetic mudstone prepared by mixing cement, clay, and water in a specific proportion. The model consists of a cubical mudstone specimen with a pre-existing tunnel and lining element. Strain gauges are installed on the lining element as well as embedded around the tunnel. The cubical sample is loaded in a true-triaxial cell at stresses equivalent to the field stress levels. Five acoustic emission sensors are also installed on the surface of a cubical specimen to record and locate any damage in the rock or the lining element. The stresses, deformations, and damages are continuously monitored for several days to study the effect of creep. Results from this experiment show the potential capability of this physical model in understanding and differentiating damage and deformation due to instant stress release and creep behavior of rock around the tunnel boundary.
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ACKNOWLEDGMENTS
The authors wish to gratefully acknowledge the support from the University Transportation Center for Underground Transportation Infrastructure (UTC-UTI) at the Colorado School of Mines for funding this research under Grant No. 69A3551747118 from the U.S. Department of Transportation (DOT). Opinions expressed in this paper are of the Authors and not the DOT.
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Information & Authors
Information
Published In
Geo-Congress 2020: Engineering, Monitoring, and Management of Geotechnical Infrastructure (GSP 316)
Pages: 335 - 344
Editors: James P. Hambleton, Ph.D., Northwestern University, Roman Makhnenko, Ph.D., University of Illinois at Urbana-Champaign, and Aaron S. Budge, Ph.D., Minnesota State University, Mankato
ISBN (Online): 978-0-7844-8279-7
Copyright
© 2020 American Society of Civil Engineers.
History
Published online: Feb 21, 2020
ASCE Technical Topics:
- Construction engineering
- Construction methods
- Continuum mechanics
- Creep
- Deformation (mechanics)
- Engineering fundamentals
- Engineering materials (by type)
- Engineering mechanics
- Geology
- Geotechnical engineering
- Linings
- Materials characterization
- Materials engineering
- Models (by type)
- Physical models
- Rheology
- Rocks
- Solid mechanics
- Stones
- Structural mechanics
- Three-dimensional models
- Tunnels
Authors
Metrics & Citations
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