Geotechnical Earthquake Engineering and Soil Dynamics V
Effect of Sustained Shear on Overburden Stress Correction in Liquefaction Resistance Evaluation
Publication: Geotechnical Earthquake Engineering and Soil Dynamics V: Liquefaction Triggering, Consequences, and Mitigation (GSP 290)
ABSTRACT
The Kσ correction factor has been routinely applied in the evaluation of liquefaction resistance of soils subjected to an overburden stress level other than 100 kPa. Its current prediction form is a function of, primarily, the overburden pressure and the relative density of the soil. Hence, its application is limited to free-field level ground condition. This study focuses on the effect of sustained shear stress, which exists in the soil layer under non-free-field or sloping ground condition, on the Kσ correction factor. The findings are largely based on a comprehensive cyclic triaxial test database with the effective confining pressure and the sustained shear stress ranged up to 500 kPa and 200 kPa respectively. The test program was performed for very loose to medium dense sand. The results show that Kσ is strongly dependent on the amount of sustained shear, in which the effect is exaggerated in more contractive soil. The observations are well supported by other test data in the literature. The study sheds light on the potential need of updating the prediction form of the Kσ correction factor.
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ACKNOWLEDGEMENTS
The tests reported and findings of the study were part of the post-graduate study of the first author. Financial support of this work was provided by the Research Grants Council of Hong Kong under Grant No. 719105 and 17250316. The work was also partially supported by the University of Hong Kong through the Research Output Prize Scheme. This paper is published with the permission of the Head of the Geotechnical Engineering Office and the Director of Civil Engineering and Development of the Government of the Hong Kong Special Administrative Region, China.
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Information & Authors
Information
Published In
Geotechnical Earthquake Engineering and Soil Dynamics V: Liquefaction Triggering, Consequences, and Mitigation (GSP 290)
Pages: 199 - 206
Editors: Scott J. Brandenberg, Ph.D., University of California, Los Angeles, and Majid T. Manzari, Ph.D., George Washington University
ISBN (Online): 978-0-7844-8145-5
Copyright
© 2018 American Society of Civil Engineers.
History
Published online: Jun 7, 2018
ASCE Technical Topics:
- Design (by type)
- Engineering fundamentals
- Fluid mechanics
- Geomechanics
- Geotechnical engineering
- Hydrologic engineering
- Laboratory tests
- Load and resistance factor design
- Load factors
- Shear resistance
- Shear stress
- Shear tests
- Soil dynamics
- Soil liquefaction
- Soil mechanics
- Soil pressure
- Soil properties
- Soil stress
- Stress (by type)
- Structural analysis
- Structural design
- Structural engineering
- Tests (by type)
- Triaxial tests
- Viscosity
- Water and water resources
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