Experimental, numerical and analytical studies on tensile strength of rocks

Erarslan, Nazife and Williams, David John (2012) Experimental, numerical and analytical studies on tensile strength of rocks. International Journal of Rock Mechanics and Mining Sciences, 49 21-30. doi:10.1016/j.ijrmms.2011.11.007


Author Erarslan, Nazife
Williams, David John
Title Experimental, numerical and analytical studies on tensile strength of rocks
Journal name International Journal of Rock Mechanics and Mining Sciences   Check publisher's open access policy
ISSN 0020-7624
0148-9062
1365-1609
1873-4545
Publication date 2012-01
Year available 2011
Sub-type Article (original research)
DOI 10.1016/j.ijrmms.2011.11.007
Volume 49
Start page 21
End page 30
Total pages 10
Place of publication East Park, Kidlington, Oxford, U.K.
Publisher Pergamon
Collection year 2012
Language eng
Formatted abstract
The difficulties associated with performing a direct uniaxial tensile test on a rock specimen have led to a number of indirect methods for assessing the tensile strength. This study compares experimental results of direct and indirect tensile tests carried out on three rock types: Brisbane tuff, granite and sandstone. The standard Brazilian indirect tensile test caused catastrophic crushing failure of the disk specimens, due to the stress concentration produced by the line loading applied and exacerbated by the brittleness of the rock tested, rather than the expected tensile splitting failure initiated by a central crack. This finding led to an investigation of the effect of loading conditions on the failure of Brazilian disk specimens using three steel loading arcs of different angle applied to three different rock types, using numerical modeling and analytical results. Numerical modeling studies were also performed to investigate the effect of a pre-existing crack on the stress distribution within Brazilian disk specimens. It was found that there is substantially higher tensile stress concentration at the center of the disk with a pre-existing crack compared with that for a disk without a pre-existing crack. The maximum stress intensity factor (fracture toughness) values at the tip of the central pre-existing cracks were determined from numerical modeling and compared with fracture toughness values obtained experimentally for the three rock types. It was concluded that a 20° loading arc gives the best estimate of the indirect tensile strength.

Highlights: ► Investigates the effect of loading conditions on the failure of Brazilian disk specimens. ► Investigates the effect of a pre-existing crack on the stress distribution within Brazilian disks. ► Includes numerical and analytical analyses to determine the indirect tensile strength of rocks. ► Showed standard Brazilian jaws caused catastrophic failure of the disk specimens. ► Concluded that a 20° loading arc gives the best estimate of the indirect tensile strength for rocks.
Keyword Brazilian test
Direct tensile strength of rock
FRANC2D
Indirect tensile strength of rock
Pre-existing crack
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 30 November 2011.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2012 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 21 times in Thomson Reuters Web of Science Article | Citations
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Created: Thu, 19 Jan 2012, 15:35:19 EST by Jeannette Watson on behalf of School of Civil Engineering