Numerical simulations of triaxial compression tests of cemented sandstone

Aigerim K. Rakhimzhanova, Colin Thornton, Nguyen Hop Minh, Sai Cheong Fok, Yong Zhao

Research output: Contribution to journalArticle

Abstract

Three-dimensional DEM simulations of triaxial compression tests of cemented sandstone samples have been performed at different values of confining pressure, initial density and bond strength. The results show that with increase in bond strength, initial density and confining pressure both the initial stiffness and peak strength increase. For a higher bond strength and initial density the samples exhibit a higher rate of dilation. Bond breakage was found to increase with confining pressure and decrease with bond strength and initial density. The Mohr-Coulomb strength parameters c' and φ' were obtained for the numerical samples and correlations between the shear strength parameters and the bond strength were established. The correlations were then used to find the value of the bond strength to be used for comparisons with results of experimental triaxial tests. The stress-strain responses of the numerical samples were found to be in good agreement with the experimental results. The critical state lines (CSL) of triaxial compression tests for both loose and medium dense systems show that the critical void ratio is independent of the initial density but increases with increase in bond strength. Increasing the bond strength increases the dilation, which leads to a higher critical state void ratio.

Original languageEnglish
Article number103068
JournalComputers and Geotechnics
Volume113
DOIs
Publication statusPublished - Sep 1 2019

Fingerprint

Sandstone
compression
sandstone
confining pressure
Computer simulation
critical state
void ratio
simulation
dilation
Shear strength
Stiffness
triaxial test
breakage
shear strength
digital elevation model
stiffness
test
parameter

Keywords

  • Cemented sand
  • Contact model
  • Discrete element method

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Computer Science Applications

Cite this

Numerical simulations of triaxial compression tests of cemented sandstone. / Rakhimzhanova, Aigerim K.; Thornton, Colin; Minh, Nguyen Hop; Fok, Sai Cheong; Zhao, Yong.

In: Computers and Geotechnics, Vol. 113, 103068, 01.09.2019.

Research output: Contribution to journalArticle

Rakhimzhanova, Aigerim K. ; Thornton, Colin ; Minh, Nguyen Hop ; Fok, Sai Cheong ; Zhao, Yong. / Numerical simulations of triaxial compression tests of cemented sandstone. In: Computers and Geotechnics. 2019 ; Vol. 113.
@article{dd36dbb1396a40c4b6449b11ac3353fa,
title = "Numerical simulations of triaxial compression tests of cemented sandstone",
abstract = "Three-dimensional DEM simulations of triaxial compression tests of cemented sandstone samples have been performed at different values of confining pressure, initial density and bond strength. The results show that with increase in bond strength, initial density and confining pressure both the initial stiffness and peak strength increase. For a higher bond strength and initial density the samples exhibit a higher rate of dilation. Bond breakage was found to increase with confining pressure and decrease with bond strength and initial density. The Mohr-Coulomb strength parameters c' and φ' were obtained for the numerical samples and correlations between the shear strength parameters and the bond strength were established. The correlations were then used to find the value of the bond strength to be used for comparisons with results of experimental triaxial tests. The stress-strain responses of the numerical samples were found to be in good agreement with the experimental results. The critical state lines (CSL) of triaxial compression tests for both loose and medium dense systems show that the critical void ratio is independent of the initial density but increases with increase in bond strength. Increasing the bond strength increases the dilation, which leads to a higher critical state void ratio.",
keywords = "Cemented sand, Contact model, Discrete element method",
author = "Rakhimzhanova, {Aigerim K.} and Colin Thornton and Minh, {Nguyen Hop} and Fok, {Sai Cheong} and Yong Zhao",
year = "2019",
month = "9",
day = "1",
doi = "10.1016/j.compgeo.2019.04.013",
language = "English",
volume = "113",
journal = "Computers and Geotechnics",
issn = "0266-352X",
publisher = "Elsevier",

}

TY - JOUR

T1 - Numerical simulations of triaxial compression tests of cemented sandstone

AU - Rakhimzhanova, Aigerim K.

AU - Thornton, Colin

AU - Minh, Nguyen Hop

AU - Fok, Sai Cheong

AU - Zhao, Yong

PY - 2019/9/1

Y1 - 2019/9/1

N2 - Three-dimensional DEM simulations of triaxial compression tests of cemented sandstone samples have been performed at different values of confining pressure, initial density and bond strength. The results show that with increase in bond strength, initial density and confining pressure both the initial stiffness and peak strength increase. For a higher bond strength and initial density the samples exhibit a higher rate of dilation. Bond breakage was found to increase with confining pressure and decrease with bond strength and initial density. The Mohr-Coulomb strength parameters c' and φ' were obtained for the numerical samples and correlations between the shear strength parameters and the bond strength were established. The correlations were then used to find the value of the bond strength to be used for comparisons with results of experimental triaxial tests. The stress-strain responses of the numerical samples were found to be in good agreement with the experimental results. The critical state lines (CSL) of triaxial compression tests for both loose and medium dense systems show that the critical void ratio is independent of the initial density but increases with increase in bond strength. Increasing the bond strength increases the dilation, which leads to a higher critical state void ratio.

AB - Three-dimensional DEM simulations of triaxial compression tests of cemented sandstone samples have been performed at different values of confining pressure, initial density and bond strength. The results show that with increase in bond strength, initial density and confining pressure both the initial stiffness and peak strength increase. For a higher bond strength and initial density the samples exhibit a higher rate of dilation. Bond breakage was found to increase with confining pressure and decrease with bond strength and initial density. The Mohr-Coulomb strength parameters c' and φ' were obtained for the numerical samples and correlations between the shear strength parameters and the bond strength were established. The correlations were then used to find the value of the bond strength to be used for comparisons with results of experimental triaxial tests. The stress-strain responses of the numerical samples were found to be in good agreement with the experimental results. The critical state lines (CSL) of triaxial compression tests for both loose and medium dense systems show that the critical void ratio is independent of the initial density but increases with increase in bond strength. Increasing the bond strength increases the dilation, which leads to a higher critical state void ratio.

KW - Cemented sand

KW - Contact model

KW - Discrete element method

UR - http://www.scopus.com/inward/record.url?scp=85065822481&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85065822481&partnerID=8YFLogxK

U2 - 10.1016/j.compgeo.2019.04.013

DO - 10.1016/j.compgeo.2019.04.013

M3 - Article

AN - SCOPUS:85065822481

VL - 113

JO - Computers and Geotechnics

JF - Computers and Geotechnics

SN - 0266-352X

M1 - 103068

ER -