Title: Correlation of microseismic and chemical properties of brittle deformation in Locharbriggs sandstone 
Resource Type: document --> technical publication --> journal article 
Country: EU Projects 
Year: 2003 
Availability: Journal of Geophysical Research 108 (B5), 2268 doi:10.1029/2002JB002277. 
Author 1/Producer: Ojala, IO 
Other Authors/Producers: Ngwenya, BT, Main, IG & Elphick, SC 
Author / Producer Type: EC Project 
Publisher: American Geophysical Union 
Publisher City: 2000 Florida Avenue N.W. Washington, DC 20009 USA 
ISSN: 0148-022 
Article Weblink (=direct link): http://www.agu.org/pubs/crossref/2003/2002JB002277.shtml  
EUGRIS Keyword(s): Contaminated land-->Soil and groundwater processes-->Geochemistry
Soil-->Soil Overview
 
Short description: Time-dependent properties of materials such as rocks depend both on preexisting cracks and chemical properties acting at their tips. This paper looks at the effect of chemical processes on a crack population using triaxial flow-through compression tests on Locharbriggs sandstone. The tests were carried out at temperatures of 25–80°C and at strain rates ranging from 10−5 to 10−8 s−1 under constant stress rate loading. Damage parameters inferred from exit pore data from the acoustic emission (AE) monitoring predicted the stress-strain curves adequately, or at least up to the point of strong microcrack coalescence. Observed environmental and strain rate dependence of mechanical properties can hence be attributed uniquely to time-dependent crack growth by the stress corrosion mechanism. 
Submitted By: Dr Stefan Gödeke WhoDoesWhat?      Last update: 15/05/2007