Laboratory Investigation of Permeability Ratio of New Liskeard Varved Soil

Chan, H. T.; Kenney, T. C.

doi:10.1139/t73-038

Cited by 47 publications

(18 citation statements)

References 12 publications

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“…Sequential permeability measurements in the same direction can be connected and the slope extended to determine the corrected permeability at measurement n=1. This approach was first proposed for use in measuring the anisotropy of varved clays to adjust the permeability for noted smearing of the varved layers across the layer boundaries (Chan and Kenney, 1973).…”

Section: Single Specimen Methodsmentioning

confidence: 99%

“…This approach was first proposed for use in measuring the anisotropy of varved clays to adjust the permeability for noted smearing of the varved layers across the layer boundaries (Chan and Kenney, 1973).…”

Section: Single Specimen Methodsmentioning

confidence: 99%

“…This process was repeated multiple times on the same specimen to determine the effects of specimen recompression. Chan and Kenney (1973) noted that re-measurement of the permeability of the same specimen lead to a decrease in the measured permeability, due to recompression effects and smearing across the varve interfaces. They provide a procedure (Figure 2-6) for correctly determining the permeability anisotropy of a specimen.…”

Section: Permeability Anisotropy Measurement Techniquesmentioning

confidence: 99%

“…Two studies applied experimental techniques requiring only 1 specimen. New Liskeard Varved clay is micro stratified and has relatively low permeability anisotropy that does not exceed 4 due to the small difference in the absolute permeability between the high and low permeability layers (Chan and Kenney, 1973). Witt and Brauns (1983) measured the permeability of uniform lenticular gravel to be 2.3 and suggested the limit of permeability anisotropy for an assemblage of uniform, lenticular particles to be 2.5.…”

Section: Permeability Anisotropy and Fabric Measurementsmentioning

confidence: 99%

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Permeability anisotropy and resistivity anisotropy of mechanically compressed mudrocks

et al. 2016

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Permeability anisotropy (the ratio of the horizontal to vertical permeability) develops in mudrocks at the macroscale due to heterogeneities such as layering and at the element scale (i.e., within a single homogeneous layer or unit) due to decreasing porosity and increasing platy particle alignment. This work describes new experimental methods and results from a laboratory program using cubic specimens to investigate the evolution of mudrock permeability and resistivity at the element scale. A systematic study analyzes the evolution of the permeability anisotropy and electrical resistivity anisotropy using resedimented Boston blue clay (RBBC) over a stress range of 0.4–40 MPa; additional measurements are presented for three other mudrocks within varying clay fraction and clay mineralogy within the stress range 1.2–10 MPa. The permeability anisotropy and the conductivity anisotropy (inverse of the resistivity anisotropy) of all four mudrocks studied ranges from 1 to 2.2 over the porosity range 0.55–0.30. A nearly 1:1 correlation between the electrical conductivity anisotropy and the permeability anisotropy is observed to be independent of clay fraction or clay mineralogy.

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Section: Single Specimen Methodsmentioning

confidence: 99%

Section: Single Specimen Methodsmentioning

confidence: 99%

Section: Permeability Anisotropy Measurement Techniquesmentioning

confidence: 99%

Section: Permeability Anisotropy and Fabric Measurementsmentioning

confidence: 99%

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Permeability anisotropy and resistivity anisotropy of mechanically compressed mudrocks

et al. 2016

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“…Kuwano & Jardine, 2002), anisotropy of permeability (e.g. Chan & Kenney, 1973), or comparison of the mechanical response of specimens prepared using different approaches (e.g. Vaid & Sivathayalan, 2000).…”

Section: Introductionmentioning

confidence: 99%

Quantifying the evolution of soil fabric during shearing using directional parameters

Fonseca¹,

O’Sullivan²,

Coop³

et al. 2013

Géotechnique

140

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Over the past 50 years, experimental studies have repeatedly demonstrated that the mechanical behaviour of sand is sensitive to the material fabric, that is, the arrangement of the grains. Up until now there have been relatively few attempts to describe this fabric quantitatively. Much of our understanding of the link between the particle movements and interactions and the macro-scale response of granular materials, including sand, comes from discrete-element modelling and experiments on 'analogue' sands with simple, idealised shapes. This paper investigates methods of quantifying the directional fabric of a real sand and its evolution under loading. Statistical analyses of the distribution of fabric directional data in terms of particle, contact normal, branch vector and void orientations were carried out at different stages of shearing deformation. The data show that the initial particle orientation fabric that develops during the deposition of the material tends to persist during shearing, while in the post-peak regime the contact normals seem to be reoriented along the direction of the major principal stress. Different patterns were observed within the shear band, as both the particles and the contact normal vectors appeared to rotate along the shear plane.

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Stress induced permeability anisotropy of Resedimented Boston Blue Clay

et al. 2013

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[1] In Resedimented Boston Blue Clay (RBBC), a low-plasticity glacio-marine illitic mudrock, the ratio of the horizontal to vertical permeability (the permeability anisotropy, r k ) increases from 1.2 to 1.9 as the porosity decreases from 0.5 to 0.37 and the permeability decreases by more than 1 order of magnitude. Backscattered Scanning Electron Microscope (BSEM) images taken at formation stress levels reveal that particles rotate perpendicular to the axial loading direction by $22 , with larger particles rotating more significantly and achieving more uniform alignment than smaller particles. We show experimentally that preferred platy particle orientation can explain our permeability anisotropy measurements. The permeability anisotropy of mechanically compressed mudrocks is minimal, <2.5. We use a novel approach (cubic specimens) to measure the evolution of permeability anisotropy in different directions on the same specimen, unlike most other methods. Modified analytic techniques allow calculation of the permeability anisotropy for a specimen using directional constant head permeability methods. A better understanding of the evolution of permeability anisotropy during sediment burial is important for modeling subsurface transport processes, including hydrocarbon migration and contaminant transport, as well as estimating in situ conditions such as pore pressure, overpressure, and effective stress.

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Laboratory Investigation of Permeability Ratio of New Liskeard Varved Soil

Cited by 47 publications

References 12 publications

Permeability anisotropy and resistivity anisotropy of mechanically compressed mudrocks

Permeability anisotropy and resistivity anisotropy of mechanically compressed mudrocks

Quantifying the evolution of soil fabric during shearing using directional parameters

Stress induced permeability anisotropy of Resedimented Boston Blue Clay

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