Understanding rock fatigue Part 1: degradation of rock fracturing resistance under cyclic loading

Erarslan, N. and Williams, D. J. (2012). Understanding rock fatigue Part 1: degradation of rock fracturing resistance under cyclic loading. In: ISRM International Symposium - EUROCK 2012. Rock Engineering and Technology for Sustainable Underground Construction: Eurock 2012, Stockholm, Sweden, (1-10). 28-30 May 2012.

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Name Description MIMEType Size Downloads
Author Erarslan, N.
Williams, D. J.
Title of paper Understanding rock fatigue Part 1: degradation of rock fracturing resistance under cyclic loading
Conference name Rock Engineering and Technology for Sustainable Underground Construction: Eurock 2012
Conference location Stockholm, Sweden
Conference dates 28-30 May 2012
Proceedings title ISRM International Symposium - EUROCK 2012
Place of Publication Lisboa, Portugal
Publisher International Society for Rock Mechanics
Publication Year 2012
Sub-type Fully published paper
Start page 1
End page 10
Total pages 10
Collection year 2013
Language eng
Formatted Abstract/Summary
This study presents the results of laboratory diametrical compression test performed on Brisbane tuff disc specimens to investigate their mode-I fracture toughness response to static and cyclic loading, as a function of the applied load. Fraction toughness (KIC) is an important material parameter that corresponds to the critical state of the stress intensity factor required for crack initiation and subsequent propagation. The static and cyclic loading tests were carried out on Cracked Chevron Notched Brazilian Disc (CCNBD) specimens prepared from Brisbane tuff cores. Two different types of cyclic loading were applied: (a) cyclic loading with constant mean level and constant amplitude, termed sinusoidal cyclic loading, and (b) cyclic loading with increasing mean level and constant amplitude, termed increasing cyclic loading.

The fracture toughness response to cyclic loading was found to be different from that under static loading in terms of the ultimate load and damage mechanism in front of the chevron crack. A maximum reduction of the static KIC of 46% was obtained for the highest amplitude increasing cyclic loading test. On the other hand, for sinusoidal cyclic loading, a maximum reduction of the static KIC of 30% was obtained. These reductions clearly illustrate the dramatic effect of cyclic loading on the fracture resistance of cracks in rocks.
Keyword Fracture toughness
CCNBD
Rock fatigue
Increasing cyclic loading
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Rock Engineering and Technology for Sustainable Underground Construction: Eurock 2012 - the 2012 ISRM International Symposium

Document type: Conference Paper
Collections: School of Civil Engineering Publications
Official 2013 Collection
 
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Created: Wed, 02 Jan 2013, 15:47:29 EST by Julie Hunter on behalf of School of Civil Engineering