Fracture evolution in artificial bedded rocks containing a structural flaw under uniaxial compression

Ding Jian Wang, Huiming Tang, Derek Elsworth, Chaoyi Wang

Research output: Contribution to journalArticle

Abstract

The Observation and prediction of crack propagation are important in understanding rock behavior in engineering practice. Previous studies have focused on homogeneous and isotropic rocks, but the influence of bedding planes on rock fracture is sparingly documented. In this study, we investigate the fracturing response in uniaxial compression of artificial bedded rocks containing variable-inclination bedding planes and single structural flaws. The recorded stress-strain data and captured cracking patterns are examined together. Nine separate crack types are identified in which bedding-plane sliding and splitting are potentially new. The presence of bedding planes plays a decisive role in crack propagation. With a steepening of the bedding plane, tensile cracks initiating from the structural flaw are better able to propagate along bedding planes, and the accumulative length of bedding fractures accordingly increases. Failure transforms from a purely tensile mode to a bedding sliding mode and subsequently to a bedding splitting mode as the bedding inclination increases. Compared to pro-dip flaw tests, the fracturing of bedding planes is triggered by both the tensile and shear stress with more far-field tensile cracks initiating from bedding planes in the specimens containing anti-dip flaws. Finally, the results are applied to predict the failure mode and fracture evolution in bedded rock slopes.

Original languageEnglish (US)
Pages (from-to)130-141
Number of pages12
JournalEngineering Geology
Volume250
DOIs
StatePublished - Feb 21 2019

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bedding plane
Compaction
compression
Rocks
Defects
rock
Cracks
Crack propagation
crack
crack propagation
sliding
dip
Tensile stress
Failure modes
Shear stress
tensile stress
shear stress
transform
engineering
prediction

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Geology

Cite this

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abstract = "The Observation and prediction of crack propagation are important in understanding rock behavior in engineering practice. Previous studies have focused on homogeneous and isotropic rocks, but the influence of bedding planes on rock fracture is sparingly documented. In this study, we investigate the fracturing response in uniaxial compression of artificial bedded rocks containing variable-inclination bedding planes and single structural flaws. The recorded stress-strain data and captured cracking patterns are examined together. Nine separate crack types are identified in which bedding-plane sliding and splitting are potentially new. The presence of bedding planes plays a decisive role in crack propagation. With a steepening of the bedding plane, tensile cracks initiating from the structural flaw are better able to propagate along bedding planes, and the accumulative length of bedding fractures accordingly increases. Failure transforms from a purely tensile mode to a bedding sliding mode and subsequently to a bedding splitting mode as the bedding inclination increases. Compared to pro-dip flaw tests, the fracturing of bedding planes is triggered by both the tensile and shear stress with more far-field tensile cracks initiating from bedding planes in the specimens containing anti-dip flaws. Finally, the results are applied to predict the failure mode and fracture evolution in bedded rock slopes.",
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Fracture evolution in artificial bedded rocks containing a structural flaw under uniaxial compression. / Wang, Ding Jian; Tang, Huiming; Elsworth, Derek; Wang, Chaoyi.

In: Engineering Geology, Vol. 250, 21.02.2019, p. 130-141.

Research output: Contribution to journalArticle

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