An X-ray CT study of miniature clay sample preparation techniques

Research output: Contribution to journalConference Contribution

Abstract

The quality and reliability of cohesive soil laboratory test data can be significantly affected by sample disturbance during sampling or sample preparation. Sample disturbance may affect key design and modelling parameters such as stiffness, preconsolidation stress, compressibility and undrained shear strength, and ultimately determine particle mobilization and shear plane development. The use of X-ray computed tomography (X-CT) in the study of soil is restricted by the inverse relationship of specimen size and obtainable image resolution. This has led to the testing of miniature specimen sizes which are far less than conventional laboratory sample size in a bid to obtain high resolution images and detailed particle-scale soil properties; however, these miniature soil specimens are more prone to sample disturbance. In this work 2% muscovite was mixed with speswhite kaolin clay as a strain marker for use in X-CT. The clay soil sample was prepared from slurry and either consolidated using an oedometer or a gypsum mould. Specimens obtained from a 7 mm tube sampler were compared to lathe trimmed specimens with a diameter (Ø) of 7 mm. Results from X-CT imaging were used to study the influence of sampler type on specimen disturbance, by analysing the muscovite particle orientation of the obtained 3D images. The results show that; for samples subjected to large consolidation stress (>200kpa) lathe trimmed specimens may be subject to lesser disturbance compared to tube sampled specimens.

Original languageEnglish
Article number01004
Number of pages6
JournalE3S Web of Conferences
Volume92
DOIs
Publication statusPublished - 25 Jun 2019

Fingerprint

sample preparation
Clay
Soils
disturbance
clay
X rays
tomography
Tomography
image resolution
Image resolution
muscovite
sampler
cohesive soil
Kaolin
Gypsum
kaolin
compressibility
Compressibility
clay soil
Shear strength

Keywords

  • soil
  • X-ray computed tomography (X-CT)
  • soil mechanics

Cite this

@article{0eeef7d83c324e009cd3be39510e9fbd,
title = "An X-ray CT study of miniature clay sample preparation techniques",
abstract = "The quality and reliability of cohesive soil laboratory test data can be significantly affected by sample disturbance during sampling or sample preparation. Sample disturbance may affect key design and modelling parameters such as stiffness, preconsolidation stress, compressibility and undrained shear strength, and ultimately determine particle mobilization and shear plane development. The use of X-ray computed tomography (X-CT) in the study of soil is restricted by the inverse relationship of specimen size and obtainable image resolution. This has led to the testing of miniature specimen sizes which are far less than conventional laboratory sample size in a bid to obtain high resolution images and detailed particle-scale soil properties; however, these miniature soil specimens are more prone to sample disturbance. In this work 2{\%} muscovite was mixed with speswhite kaolin clay as a strain marker for use in X-CT. The clay soil sample was prepared from slurry and either consolidated using an oedometer or a gypsum mould. Specimens obtained from a 7 mm tube sampler were compared to lathe trimmed specimens with a diameter ({\O}) of 7 mm. Results from X-CT imaging were used to study the influence of sampler type on specimen disturbance, by analysing the muscovite particle orientation of the obtained 3D images. The results show that; for samples subjected to large consolidation stress (>200kpa) lathe trimmed specimens may be subject to lesser disturbance compared to tube sampled specimens.",
keywords = "soil, X-ray computed tomography (X-CT), soil mechanics",
author = "Christopher Ibeh and Matteo Pedrotti and Alessandro Tarantino and Rebecca Lunn",
note = "Presented at the 7th International Symposium on Deformation Characteristics of Geomaterials (IS-Glasgow 2019).",
year = "2019",
month = "6",
day = "25",
doi = "10.1051/e3sconf/20199201004",
language = "English",
volume = "92",
journal = "E3S Web of Conferences",
issn = "2267-1242",

}

TY - JOUR

T1 - An X-ray CT study of miniature clay sample preparation techniques

AU - Ibeh, Christopher

AU - Pedrotti, Matteo

AU - Tarantino, Alessandro

AU - Lunn, Rebecca

N1 - Presented at the 7th International Symposium on Deformation Characteristics of Geomaterials (IS-Glasgow 2019).

PY - 2019/6/25

Y1 - 2019/6/25

N2 - The quality and reliability of cohesive soil laboratory test data can be significantly affected by sample disturbance during sampling or sample preparation. Sample disturbance may affect key design and modelling parameters such as stiffness, preconsolidation stress, compressibility and undrained shear strength, and ultimately determine particle mobilization and shear plane development. The use of X-ray computed tomography (X-CT) in the study of soil is restricted by the inverse relationship of specimen size and obtainable image resolution. This has led to the testing of miniature specimen sizes which are far less than conventional laboratory sample size in a bid to obtain high resolution images and detailed particle-scale soil properties; however, these miniature soil specimens are more prone to sample disturbance. In this work 2% muscovite was mixed with speswhite kaolin clay as a strain marker for use in X-CT. The clay soil sample was prepared from slurry and either consolidated using an oedometer or a gypsum mould. Specimens obtained from a 7 mm tube sampler were compared to lathe trimmed specimens with a diameter (Ø) of 7 mm. Results from X-CT imaging were used to study the influence of sampler type on specimen disturbance, by analysing the muscovite particle orientation of the obtained 3D images. The results show that; for samples subjected to large consolidation stress (>200kpa) lathe trimmed specimens may be subject to lesser disturbance compared to tube sampled specimens.

AB - The quality and reliability of cohesive soil laboratory test data can be significantly affected by sample disturbance during sampling or sample preparation. Sample disturbance may affect key design and modelling parameters such as stiffness, preconsolidation stress, compressibility and undrained shear strength, and ultimately determine particle mobilization and shear plane development. The use of X-ray computed tomography (X-CT) in the study of soil is restricted by the inverse relationship of specimen size and obtainable image resolution. This has led to the testing of miniature specimen sizes which are far less than conventional laboratory sample size in a bid to obtain high resolution images and detailed particle-scale soil properties; however, these miniature soil specimens are more prone to sample disturbance. In this work 2% muscovite was mixed with speswhite kaolin clay as a strain marker for use in X-CT. The clay soil sample was prepared from slurry and either consolidated using an oedometer or a gypsum mould. Specimens obtained from a 7 mm tube sampler were compared to lathe trimmed specimens with a diameter (Ø) of 7 mm. Results from X-CT imaging were used to study the influence of sampler type on specimen disturbance, by analysing the muscovite particle orientation of the obtained 3D images. The results show that; for samples subjected to large consolidation stress (>200kpa) lathe trimmed specimens may be subject to lesser disturbance compared to tube sampled specimens.

KW - soil

KW - X-ray computed tomography (X-CT)

KW - soil mechanics

U2 - 10.1051/e3sconf/20199201004

DO - 10.1051/e3sconf/20199201004

M3 - Conference Contribution

VL - 92

JO - E3S Web of Conferences

JF - E3S Web of Conferences

SN - 2267-1242

M1 - 01004

ER -