Eighth International Conference on Case Histories in Geotechnical Engineering
A Study on Thermal Consolidation of Fine Grained Soils Using Modified Consolidometer
Publication: Geo-Congress 2019: Soil Improvement (GSP 309)
ABSTRACT
In order to fully understand the thermo-hydro-mechanical behavior of the geotechnical infrastructures, the effects of temperature variations on soil properties and soil behavior have to be studied. Hydraulic conductivity, strength, volume change, moisture content, and pore pressure generation and dissipation rates depend on temperature variations. Thermal loading might induce excess pore water pressure and volumetric changes. Temperature changes in the fine-grained soils will cause expansion in water and soil particles. Since the coefficient of expansion for soil particles is much smaller than that for water, a generation of pore water pressure is expected. This thermally induced pore water pressure and then its dissipation during the relaxation period results in a time dependent consolidation. Thermal consolidation in fine grained soil is more dominant and can be irreversible in normally consolidated clay. However, the volumetric changes of highly over consolidated soil caused by temperature increment is reversible by temperature reduction. In this research, a modified consolidation testing device is used to study the effect of temperature increments (e.g., increasing step by step temperature increments to 80°C) on the consolidation of fine grained soils. In another words the effect of temperature increments during the test on the consolidation process is studied. Time of applying the heating, target temperature, and initial void ratio are parameters affecting the rate and the amount of consolidation in the samples.
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ACKNOWLEDGEMENTS
The authors would also like to gratefully acknowledge the financial support by the National Science Foundation under Grant No. CMMI-1804822.
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Information & Authors
Information
Published In
Geo-Congress 2019: Soil Improvement (GSP 309)
Pages: 148 - 156
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): 978-0-7844-8211-7
Copyright
© 2019 American Society of Civil Engineers.
History
Published online: Mar 21, 2019
Published in print: Mar 21, 2019
ASCE Technical Topics:
- Consolidated soils
- Continuum mechanics
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering mechanics
- Fine-grained soils
- Geomechanics
- Geotechnical engineering
- Measurement (by type)
- Pore pressure
- Pressure (type)
- Soil mechanics
- Soil properties
- Soil water
- Soils (by type)
- Solid mechanics
- Temperature effects
- Temperature measurement
- Thermal properties
- Thermodynamics
- Water pressure
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