Chapter
May 7, 2012
A Calculation Method of Secondary Compression Index for Natural Sedimentary Clays Using Void Index
Publication: Soil Behavior and Geo-Micromechanics
Abstract
A series of oedometer tests were performed on both undisturbed and remolded samples of Lianyungang clays to investigate the secondary compression behavior. The results of natural clays show that the coefficient of secondary compression, Cα, reaches the maximum dramatically in the vicinity of the consolidation yield stress. When the consolidation pressure is less than the yield stress (termed as pre-yield state), the creep can be neglected. But Cα decreases with the increase in consolidation stress in the post-yield state (i.e. the consolidation pressure being greater than the yield stress), similar to remolded samples. In addition, it is found that there is a unique relationship between the difference in coefficient of secondary compression, (Cα—Cα*), and the difference of void index (ΔIv) between undisturbed and remolded samples. Furthermore, a simple method is proposed for predicting secondary compression index of natural clays.
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© 2010 American Society of Civil Engineers.
History
Published online: May 7, 2012
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ASCE Technical Topics:
- Clays
- Compressive strength
- Consolidated soils
- Geomechanics
- Geotechnical engineering
- Material mechanics
- Material properties
- Materials engineering
- River engineering
- Rock mechanics
- Sediment
- Soil compression
- Soil dynamics
- Soil mechanics
- Soil properties
- Soils (by type)
- Strength of materials
- Stress (by type)
- Structural analysis
- Structural engineering
- Voids
- Water and water resources
- Yield stress
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Ph.D. Candidate, Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, P. R. China.E-mail: [email protected]
Professor, Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, P. R. China.E-mail: liusy@seu. edu.cn
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