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The Relationship of Roof Movement and Strata-Induced Microseismic Emissions to Roof Falls

By Iannacchione, Anthony T.

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Book Id: WPLBN0000118349
Format Type: PDF eBook
File Size: 0.4 MB
Reproduction Date: 2005
Full Text

Title: The Relationship of Roof Movement and Strata-Induced Microseismic Emissions to Roof Falls  
Author: Iannacchione, Anthony T.
Volume:
Language: English
Subject: Health., Medical research, Medical reports
Collections: Medical Library Collection
Historic
Publication Date:
Publisher: Centers for Disease Control and Prevention

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Iannacchione, A. T. (n.d.). The Relationship of Roof Movement and Strata-Induced Microseismic Emissions to Roof Falls. Retrieved from http://hawaiilibrary.net/


Excerpt
Typically, when roof rock fractures it produces audible microseismic emissions of different magnitudes that are transmitted through rock as elastic waves with varying degrees of propagation. If sufficient fracturing occurs, the roof rock begins to deflect into the mine opening. Factors influencing the rate of roof rock movement have been discussed by several authors (Parker, 1973; Maleki and McVey, 1988; Altounyan, et al., 1997; and Iannacchione, et al., 2000). Generally, microfracturing begins to occur as strain levels approach 50% of the rock’s ultimate strength (Hardy, 1975). As individual layers of roof rock move closer to their ultimate strength, they begin to fail by rupturing or cracking in shear or tension (Obert and Duvall, 1967; Gale, et al., 2001). As more rock fractures occur within a defined volume of rock, the potential for the roof rock failing increases (Hardy, 1975; Brady and Haramy, 1994; Iannacchione, et al., 2001).

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