Experimental and numerical studies on determination of indirect tensile strength of rocks

Erarslan, Nazife, Liang, Zheng Zhao and Williams, David John (2012) Experimental and numerical studies on determination of indirect tensile strength of rocks. Rock Mechanics and Rock Engineering, 45 5: 739-751. doi:10.1007/s00603-011-0205-y


Author Erarslan, Nazife
Liang, Zheng Zhao
Williams, David John
Title Experimental and numerical studies on determination of indirect tensile strength of rocks
Journal name Rock Mechanics and Rock Engineering   Check publisher's open access policy
ISSN 0723-2632
1434-453X
Publication date 2012-09
Sub-type Article (original research)
DOI 10.1007/s00603-011-0205-y
Open Access Status
Volume 45
Issue 5
Start page 739
End page 751
Total pages 13
Place of publication Vienna, Austria
Publisher Springer Wien
Collection year 2013
Language eng
Formatted abstract
Indirect tension tests using Brisbane tuff Brazilian disc specimens under standard Brazilian jaws and various loading arcs were performed. The standard Brazilian indirect tensile tests caused catastrophic, crushing failure of the disc specimens, rather than the expected tensile splitting failure initiated by a central crack. This led to an investigation of the fracturing of Brazilian disc specimens and the existing indirect tensile Brazilian test using steel loading arcs with different angles. The results showed that the ultimate failure load increased with increasing loading arc angles. With no international standard for determining indirect tensile strength of rocks under diametral load, numerical modelling and analytical solutions were undertaken. Numerical simulations using RFPA2D software were conducted with a heterogeneous material model. The results predicted tensile stress in the discs and visually reproduced the progressive fracture process. It was concluded that standard Brazilian jaws cause catastrophic, crushing failure of the disc specimens instead of producing a central splitting crack. The experimental and numerical results showed that 20° and 30° loading arcs result in diametral splitting fractures starting at the disc centre. Moreover, intrinsic material properties (e.g. fracture toughness) may be used to propose the best loading configuration to determine the indirect tensile strength of rocks. Here, by using numerical outcomes and empirical relationships between fracture toughness and tensile strength, the best loading geometry to obtain the most accurate indirect tensile strength of rocks was the 2α = 30° loading arc.
Keyword Indirect tensile strength
Brazilian test
RFPA method
Diametral loading of rock discs
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online: 25 November 2011

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2013 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 16 times in Thomson Reuters Web of Science Article | Citations
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Created: Thu, 19 Jan 2012, 15:49:52 EST by Jeannette Watson on behalf of School of Civil Engineering