Critical state behaviour of weakly bonded soil in drained state

Zulfahmi Ali Rahman, D. G. Toll, D. Gallipoli

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A series of consolidated drained triaxial test was performed on weakly bonded soils that were artificially prepared by mixing sand (87%) and kaolin (13%). To create weakly bond strength, samples were fired at 500°C for 5 h. A critical state (CS) concept was used to interpret the results in order to describe the behaviour of the studied soil. Defining the CS is not always straightforward. Several tests showed changing in deviator stress q and volumetric strain εv up to the end of tests. Hence, defining the CS requires careful assessments on q–εa, Δu–εa, q–p′ and v–ln p′ spaces which were performed. A ‘discontinuity’ approach was applied to position the CS on dilatant path in v–ln p′ spaces after considering stress-strain and volumetric strain curves. The critical state line in a v–ln pʹ space from bonded samples exhibited differences to the destructured samples. This suggests that the influence of cementation bond is substantially clear at lower stresses but as stresses increase beyond the stress yield, cementation degradation becomes more significant. The effect of bonding can be clearly visualised from the normalisation of the stress paths of destructured and bonded samples.

Original languageEnglish
Pages (from-to)1-13
Number of pages13
JournalGeomechanics and Geoengineering
DOIs
Publication statusAccepted/In press - 24 Mar 2018

Fingerprint

critical state
Soils
soil
cementation
Kaolin
kaolin
Yield stress
triaxial test
Sand
discontinuity
Degradation
degradation
sand

Keywords

  • bonded soil
  • Critical state
  • normalisation
  • stress path

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

Cite this

Critical state behaviour of weakly bonded soil in drained state. / Ali Rahman, Zulfahmi; Toll, D. G.; Gallipoli, D.

In: Geomechanics and Geoengineering, 24.03.2018, p. 1-13.

Research output: Contribution to journalArticle

@article{6ff8f0fa88ad4c768863f11197b6d2fc,
title = "Critical state behaviour of weakly bonded soil in drained state",
abstract = "A series of consolidated drained triaxial test was performed on weakly bonded soils that were artificially prepared by mixing sand (87{\%}) and kaolin (13{\%}). To create weakly bond strength, samples were fired at 500°C for 5 h. A critical state (CS) concept was used to interpret the results in order to describe the behaviour of the studied soil. Defining the CS is not always straightforward. Several tests showed changing in deviator stress q and volumetric strain εv up to the end of tests. Hence, defining the CS requires careful assessments on q–εa, Δu–εa, q–p′ and v–ln p′ spaces which were performed. A ‘discontinuity’ approach was applied to position the CS on dilatant path in v–ln p′ spaces after considering stress-strain and volumetric strain curves. The critical state line in a v–ln pʹ space from bonded samples exhibited differences to the destructured samples. This suggests that the influence of cementation bond is substantially clear at lower stresses but as stresses increase beyond the stress yield, cementation degradation becomes more significant. The effect of bonding can be clearly visualised from the normalisation of the stress paths of destructured and bonded samples.",
keywords = "bonded soil, Critical state, normalisation, stress path",
author = "{Ali Rahman}, Zulfahmi and Toll, {D. G.} and D. Gallipoli",
year = "2018",
month = "3",
day = "24",
doi = "10.1080/17486025.2018.1454608",
language = "English",
pages = "1--13",
journal = "Geomechanics and Geoengineering",
issn = "1748-6025",
publisher = "Taylor and Francis Ltd.",

}

TY - JOUR

T1 - Critical state behaviour of weakly bonded soil in drained state

AU - Ali Rahman, Zulfahmi

AU - Toll, D. G.

AU - Gallipoli, D.

PY - 2018/3/24

Y1 - 2018/3/24

N2 - A series of consolidated drained triaxial test was performed on weakly bonded soils that were artificially prepared by mixing sand (87%) and kaolin (13%). To create weakly bond strength, samples were fired at 500°C for 5 h. A critical state (CS) concept was used to interpret the results in order to describe the behaviour of the studied soil. Defining the CS is not always straightforward. Several tests showed changing in deviator stress q and volumetric strain εv up to the end of tests. Hence, defining the CS requires careful assessments on q–εa, Δu–εa, q–p′ and v–ln p′ spaces which were performed. A ‘discontinuity’ approach was applied to position the CS on dilatant path in v–ln p′ spaces after considering stress-strain and volumetric strain curves. The critical state line in a v–ln pʹ space from bonded samples exhibited differences to the destructured samples. This suggests that the influence of cementation bond is substantially clear at lower stresses but as stresses increase beyond the stress yield, cementation degradation becomes more significant. The effect of bonding can be clearly visualised from the normalisation of the stress paths of destructured and bonded samples.

AB - A series of consolidated drained triaxial test was performed on weakly bonded soils that were artificially prepared by mixing sand (87%) and kaolin (13%). To create weakly bond strength, samples were fired at 500°C for 5 h. A critical state (CS) concept was used to interpret the results in order to describe the behaviour of the studied soil. Defining the CS is not always straightforward. Several tests showed changing in deviator stress q and volumetric strain εv up to the end of tests. Hence, defining the CS requires careful assessments on q–εa, Δu–εa, q–p′ and v–ln p′ spaces which were performed. A ‘discontinuity’ approach was applied to position the CS on dilatant path in v–ln p′ spaces after considering stress-strain and volumetric strain curves. The critical state line in a v–ln pʹ space from bonded samples exhibited differences to the destructured samples. This suggests that the influence of cementation bond is substantially clear at lower stresses but as stresses increase beyond the stress yield, cementation degradation becomes more significant. The effect of bonding can be clearly visualised from the normalisation of the stress paths of destructured and bonded samples.

KW - bonded soil

KW - Critical state

KW - normalisation

KW - stress path

UR - http://www.scopus.com/inward/record.url?scp=85044370570&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85044370570&partnerID=8YFLogxK

U2 - 10.1080/17486025.2018.1454608

DO - 10.1080/17486025.2018.1454608

M3 - Article

AN - SCOPUS:85044370570

SP - 1

EP - 13

JO - Geomechanics and Geoengineering

JF - Geomechanics and Geoengineering

SN - 1748-6025

ER -