Geo-Congress 2020
3D Ground Movements Due to Tunnel Face Collapse
Publication: Geo-Congress 2020: Engineering, Monitoring, and Management of Geotechnical Infrastructure (GSP 316)
ABSTRACT
Soil movements due to tunnel face collapse have catastrophic effects on both surface and underground structures and utilities. The aim of this study is to determine the extent of the zone of influence resulting from tunnel face movements, experimentally. Several models made of transparent soils were employed to visualize deformations leading to tunnel-face collapse. A soft transparent synthetic clay made of magnesium lithium phyllosilicate (MLPS), which is commercially known as Laponite RD was employed to simulate a soft marine clay. An embedded plane of seeded particles was used to track soil movements. Digital image correlation (DIC, aka particle image velocimetry, PIV) was employed to obtain deformations perpendicular and parallel to the tunnel face. These deformations were combined to obtain the 3D zone of influence and compute the resulting volumetric and shear strains. The effect of tunnel face displacement on surface and subsurface settlements are presented for two tunneling configurations. Settlements due to a range of face losses resulting from retraction of the tunnel face by 5% to 30% of the tunnel diameter, were determined, and correlated to the observed ground displacements.
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Information & Authors
Information
Published In
Geo-Congress 2020: Engineering, Monitoring, and Management of Geotechnical Infrastructure (GSP 316)
Pages: 309 - 319
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
Published in print: Feb 21, 2020
ASCE Technical Topics:
- Clays
- Continuum mechanics
- Deformation (mechanics)
- Engineering mechanics
- Forensic engineering
- Geomechanics
- Geotechnical engineering
- Geotechnical investigation
- Ground motion
- Infrastructure
- Lifeline systems
- Soft soils
- Soil deformation
- Soil mechanics
- Soils (by type)
- Solid mechanics
- Structural engineering
- Structural failures
- Structural mechanics
- Structures (by type)
- Subsurface utilities
- Tunnels
- Underground structures
Authors
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