Eighth International Conference on Case Histories in Geotechnical Engineering
Effect of Plasticity on Liquefaction of a Selected Fine-Grained Soil
Publication: Geo-Congress 2019: Earthquake Engineering and Soil Dynamics (GSP 308)
ABSTRACT
This paper presents the influence of plasticity on liquefaction characteristics of a selected fine-grained soil. The effect of plasticity was evaluated in terms of pore water pressure generation and deformation characteristics of the fine-grained soils with cyclic loading. Stress-controlled cyclic triaxial tests were performed for this purpose. Test samples were prepared at comparable dry densities with varying plasticity index (PI). Sil-Co-Sil #40, a non-plastic commercial silt and EPK Kaolin clay were used as base materials. These materials were mixed in different proportions to obtain desired PI values. The PIs of the tested samples were varied over reasonably wide range [non-plastic (NP), 2.7, 3.5, 5.7, 9.8, and 14.5]. The samples were tested at an initial effective confining pressure of 34.5 kPa (5.0 psi) using a cyclic stress ratio (CSR) of 0.2, 0.3, and 0.4. The results indicate that with an increase in PI of the soil samples tested from NP to 14.5, liquefaction resistance of the soil in terms of deformation decreases initially and then increases with an increase of PI. Similar effect of plasticity on the liquefaction characteristics of soil was observed while evaluating in terms of pore pressure generation. The tests also revealed that, the rate of pore pressure generation first increases with an increase of PI from non-plastic to 3.5 and then decreases with increase of PI beyond 3.5.
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Information & Authors
Information
Published In
Geo-Congress 2019: Earthquake Engineering and Soil Dynamics (GSP 308)
Pages: 374 - 383
Editors: Christopher L. Meehan, Ph.D., University of Delaware, Sanjeev Kumar, Ph.D., Southern Illinois University Carbondale, Miguel A. Pando, Ph.D., University of North Carolina Charlotte, and Joseph T. Coe, Ph.D., Temple University
ISBN (Online): 978-0-7844-8210-0
Copyright
© 2019 American Society of Civil Engineers.
History
Published online: Mar 21, 2019
Published in print: Mar 21, 2019
ASCE Technical Topics:
- Continuum mechanics
- Deformation (mechanics)
- Dynamics (solid mechanics)
- Engineering mechanics
- Fine-grained soils
- Geomechanics
- Geotechnical engineering
- Plasticity
- Pore pressure
- Pressure (type)
- Soil deformation
- Soil dynamics
- Soil liquefaction
- Soil mechanics
- Soil pressure
- Soil properties
- Soils (by type)
- Solid mechanics
- Structural mechanics
- Water pressure
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