Mechanical behavior of rock-like jointed blocks with multi-non-persistent joints under uniaxial loading: A particle mechanics approach

Xiang Fan, Pinnaduwa Kulatilake, Xin Chen

Research output: Contribution to journalArticle

71 Citations (Scopus)

Abstract

By selecting appropriate micro-mechanical parameter values through a trial and error procedure, the computer code PFC3D was used to study the macro-mechanical behavior of jointed blocks having multi-non-persistent joints with high joint density under uniaxial loading. The focus was to study the effect of joint orientation, size and joint mechanical properties on jointed block strength, deformability, stress-strain relation and failure modes at the jointed block level. Both the uniaxial compressive strength of the block, UCSB, and block deformability modulus, DMB, were found to depend heavily on the joint dip angle, β, and joint continuity factor, k. The joint particle stiffness was found to play a minor to a significant role on UCSB depending on β and k values. The joint particle stiffness was found to play a negligible to a moderate role on DMB depending on β and k values. The jointed blocks produced three types of stress-strain curves labeled as Type I through Type III. A relation seems to exist as explained in Section4 of the paper between the types of curves and β and k values. The dominance of tensile failures over the shear failures was observed for all three types of curves based on the micro-mechanical parameter values used in the paper. The UCSB, rate of bond failures and the number of bond breakages were found to decrease as the curve type moves from Type I to Type III through Type II. The jointed blocks resulted in 4 failure modes as follows: (1) splitting failure; (2) plane failure; (3) stepped path and (4) intact material failure. The main features of each failure mode and possible relations between the failure modes, UCSB and β and k values are given in Section5 of the paper.

Original languageEnglish (US)
Pages (from-to)17-32
Number of pages16
JournalEngineering Geology
Volume190
DOIs
StatePublished - May 4 2015

Fingerprint

Failure modes
mechanics
stiffness
Mechanics
Rocks
Formability
breakage
compressive strength
rock
dip
mechanical property
Stiffness
Stress-strain curves
Compressive strength
Macros
Mechanical properties
parameter
particle
code
rate

Keywords

  • Failure modes
  • Jointed blocks
  • Mechanical properties
  • Non-persistent joints
  • PFC

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Geology

Cite this

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title = "Mechanical behavior of rock-like jointed blocks with multi-non-persistent joints under uniaxial loading: A particle mechanics approach",
abstract = "By selecting appropriate micro-mechanical parameter values through a trial and error procedure, the computer code PFC3D was used to study the macro-mechanical behavior of jointed blocks having multi-non-persistent joints with high joint density under uniaxial loading. The focus was to study the effect of joint orientation, size and joint mechanical properties on jointed block strength, deformability, stress-strain relation and failure modes at the jointed block level. Both the uniaxial compressive strength of the block, UCSB, and block deformability modulus, DMB, were found to depend heavily on the joint dip angle, β, and joint continuity factor, k. The joint particle stiffness was found to play a minor to a significant role on UCSB depending on β and k values. The joint particle stiffness was found to play a negligible to a moderate role on DMB depending on β and k values. The jointed blocks produced three types of stress-strain curves labeled as Type I through Type III. A relation seems to exist as explained in Section4 of the paper between the types of curves and β and k values. The dominance of tensile failures over the shear failures was observed for all three types of curves based on the micro-mechanical parameter values used in the paper. The UCSB, rate of bond failures and the number of bond breakages were found to decrease as the curve type moves from Type I to Type III through Type II. The jointed blocks resulted in 4 failure modes as follows: (1) splitting failure; (2) plane failure; (3) stepped path and (4) intact material failure. The main features of each failure mode and possible relations between the failure modes, UCSB and β and k values are given in Section5 of the paper.",
keywords = "Failure modes, Jointed blocks, Mechanical properties, Non-persistent joints, PFC",
author = "Xiang Fan and Pinnaduwa Kulatilake and Xin Chen",
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T2 - A particle mechanics approach

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