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Deformation pattern and permeability change of compacted clay under triaxial compression
Abstract Compacted clay is a traditional material for constructing waterproofs and sealing systems. As it would inevitably deform during construction and operation periods, it is important to investigate the permeability change of compacted clay during deformation processes. In this study, the permeability change of a compacted clay during consolidated drained triaxial compression was investigated by conducting seepage tests at different axial strains. To reveal the mechanism of permeability change, the industrial X-ray CT was applied to scan some sheared samples and the internal deformation details of the samples were visualized. The test results showed that the samples exhibited two different patterns of deformation behavior: the homogenous deformation of barrel shape and the localized deformation of shear bands, and correspondingly, the permeability might decrease or increase with increasing shear strain. It was found that the relative magnitude of current confining pressure and preconsolidation pressure of the samples determined the deformation patterns as well as the permeability change. When current confining pressure was greater than preconsolidation pressure, the normally consolidated samples contracted during triaxial compression and became denser, and then resulting in a decreasing trend in permeability. Conversely, when current confining pressure was far smaller than preconsolidation pressure, the overconsolidated samples expanded during triaxial compression and generated localized shear bands with open cracks, and it was the leakage through the cracks that led to the increase of permeability.
Deformation pattern and permeability change of compacted clay under triaxial compression
Abstract Compacted clay is a traditional material for constructing waterproofs and sealing systems. As it would inevitably deform during construction and operation periods, it is important to investigate the permeability change of compacted clay during deformation processes. In this study, the permeability change of a compacted clay during consolidated drained triaxial compression was investigated by conducting seepage tests at different axial strains. To reveal the mechanism of permeability change, the industrial X-ray CT was applied to scan some sheared samples and the internal deformation details of the samples were visualized. The test results showed that the samples exhibited two different patterns of deformation behavior: the homogenous deformation of barrel shape and the localized deformation of shear bands, and correspondingly, the permeability might decrease or increase with increasing shear strain. It was found that the relative magnitude of current confining pressure and preconsolidation pressure of the samples determined the deformation patterns as well as the permeability change. When current confining pressure was greater than preconsolidation pressure, the normally consolidated samples contracted during triaxial compression and became denser, and then resulting in a decreasing trend in permeability. Conversely, when current confining pressure was far smaller than preconsolidation pressure, the overconsolidated samples expanded during triaxial compression and generated localized shear bands with open cracks, and it was the leakage through the cracks that led to the increase of permeability.
Deformation pattern and permeability change of compacted clay under triaxial compression
Wei, Linyi (author) / Wang, Gang (author)
2022
Article (Journal)
Electronic Resource
English
BKL:
56.00$jBauwesen: Allgemeines
/
38.58
Geomechanik
/
38.58$jGeomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
56.00
Bauwesen: Allgemeines
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB18
Permeability of compacted clay
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