Seismic studies of rock fracture at the Underground Research Laboratory, Canada

Autor:	R. P. Young, D.S. Collins
Rok vydání:	2001
Předmět:	Stress (mechanics) Engineering Microseism Acoustic emission business.industry Damage zone Fluid dynamics Excavation Geotechnical engineering Geotechnical Engineering and Engineering Geology Material properties business
Zdroj:	International Journal of Rock Mechanics and Mining Sciences. 38:787-799
ISSN:	1365-1609
DOI:	10.1016/s1365-1609(01)00043-0
Popis:	The tunnel sealing experiment at the Underground Research Laboratory in Canada is testing engineered barriers (concrete and clay bulkheads) that will restrict fluid flow passing through the excavation damage zone (EDZ) in the host granitic rockmass. 3D elastic stress modeling has shown that keyed bulkheads significantly disrupt and reduce the high differential stresses around the excavation perimeter. The use of microseismic (MS) and acoustic emission (AE) methods are shown to be a valuable tool for delineating the extent of the EDZ, substantiating the stress modeling, and also for identifying how much tunnel perimeter confinement is needed to stop the occurrence of micro-cracking. In addition, active ultrasonic surveys using AE sensors are shown to be able to quantify the change in material properties such as crack density that have occurred during the development of the EDZ.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e0579741d095df11dd19dcca52608782 https://doi.org/10.1016/s1365-1609(01)00043-0 Zobrazit plný text záznamu Full Text from ScienceDirect