Geo-Congress 2020
Ultrasonic Investigation of Shear Slip Nucleation in Granular Materials under Variable Normal Stresses
Publication: Geo-Congress 2020: Modeling, Geomaterials, and Site Characterization (GSP 317)
ABSTRACT
Understanding the role of normal stress variations in rock joints with fill materials has important implications for interpretation of rock slope failures, fault movements, and earthquake nucleation. In this study, the main objective is to explore the impact of normal stress variations on shear failure of granular fill materials by utilizing ultrasonic shear waves. For this purpose, granular quartz specimens were sheared in a single direct shear apparatus equipped with an ultrasonic imaging system. The experimental program consisted of different phases to simulate natural conditions including the reduction in the applied effective stress. The obtained data provided measures of variations in shear strength and frictional stability as well as ultrasonic wave attributes with the changes in normal stress and shearing velocity. The results indicated a close link between the changes in ultrasonic amplitude and the layer porosity. Observed slip and creep phases were also captured in the transmitted amplitude variations. Moreover, an ultrasonic precursor to the dynamic shear failure was identified in the form the transmitted amplitude rate change.
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Information & Authors
Information
Published In
Geo-Congress 2020: Modeling, Geomaterials, and Site Characterization (GSP 317)
Pages: 425 - 433
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): 978-0-7844-8280-3
Copyright
© 2020 American Society of Civil Engineers.
History
Published online: Feb 21, 2020
Published in print: Feb 21, 2020
ASCE Technical Topics:
- Continuum mechanics
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering materials (by type)
- Engineering mechanics
- Failure modes
- Field tests
- Forensic engineering
- Granular materials
- Material failures
- Material mechanics
- Material properties
- Materials characterization
- Materials engineering
- Nondestructive tests
- Seismic waves
- Shear failures
- Shear strength
- Shear stress
- Shear waves
- Solid mechanics
- Strength of materials
- Stress (by type)
- Structural analysis
- Structural engineering
- Tests (by type)
- Waves (mechanics)
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