Indirect Assessment of Mechanical Behaviour of Varved Clays under Freezing-Thawing Cycle Using Soil-Water and Soil-Freezing Characteristic Curves of Constituent Laminae
Publication: Geo-Congress 2024
ABSTRACT
Due to the increase in global average temperatures, seasonal ground deformation has become a crucial engineering aspect for the safe design of structures built on permafrost regions. The present study investigates frost heave and thaw settlement in a cold region through finite element modelling (FEM). The study focuses on the effect of sequential placement of laminae on reconstituted varved clay profiles under free convective flow due to temperature gradients followed by freezing and thawing processes. Two representative soils were chosen to simulate the two laminae of actual varved clays. To perform numerical modelling, the input for van Genuchten parameters, water contents, saturated permeability, index parameters, stiffness parameters, and shear strength parameters were determined through laboratory tests, and thermal properties were adopted from the literature. The soil freezing characteristic curves (SFCCs) were obtained using the corresponding soil water characteristic curves (SWCCs). The study shows that the two selected soils exhibit varying levels of deformation under similar temperature conditions. Furthermore, the sequential placement of the two soils to create a reconstituted varved clay profile also impacted the deformation.
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Information & Authors
Information
Published In
Geo-Congress 2024
Pages: 733 - 741
History
Published online: Feb 22, 2024
ASCE Technical Topics:
- Clays
- Cold regions engineering
- Continuum mechanics
- Curvature
- Deformation (mechanics)
- Engineering fundamentals
- Engineering mechanics
- Freeze and thaw
- Frozen soils
- Geomechanics
- Geometry
- Geotechnical engineering
- Mathematics
- Parameters (statistics)
- Soil deformation
- Soil mechanics
- Soil properties
- Soil water
- Soils (by type)
- Solid mechanics
- Statistics
- Structural mechanics
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