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Effect of confining stress and loading rate on fracture toughness of rocks.

Authors
Warneke-J; Dwyer-JG; Orr-T
Source
Rock Mechanics: Meeting Society's Challenges and Demands, Volume 1: Fundamentals, New Technologies & New Ideas. Proceedings of the 1st Canada-US Rock Mechanics Symposium, May 27-31 2007 Vancouver, Canada. Eberhardt EB, Stead D, Morrison T, eds., London: Taylor & Francis, 2007 May; 1:625-629
Link
NIOSHTIC No.
20035503
Abstract
In this research, the effect of confining stress and loading rate on the fracture toughness has been investigated. The short beam compression test has been used to estimate the fracture toughness for Flagstaff sandstone. A brief theoretical analysis of the effects of confining stress and loading rate the fracture toughness is presented. This analysis considers changes to the critical fracture process zone size due to confining stress and loading rate. It is found that experimental results agree with the fracture mechanics theory. The mode II fracture toughness is found to increase with increasing confining stress and increasing loading rate.
Keywords
Mining-industry; Underground-mining; Ground-control; Ground-stability; Models; Rock-mechanics; Stress
Publication Date
20070517
Document Type
Conference/Symposia Proceedings
Editors
Eberhardt-EB; Stead-D; Morrison-T
Fiscal Year
2007
NTIS Accession No.
NTIS Price
ISBN No.
9780415444019
NIOSH Division
SRL
Source Name
Rock Mechanics: Meeting Society's Challenges and Demands. Proceedings of the 1st Canada-US Rock Mechanics Symposium, May 27-31 2007 Vancouver, Canada.
State
WA
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