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Predicting rock bursts in mines

Earthquake Information Bulletin (USGS)
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Abstract

In terms of lives lost, rock bursts in underground mines can be as hazardous as earthquakes on the surface. So it is not surprising that fo the last 40 years the U.S Bureau of Mines has been using seismic methods for detecting areas in underground mines where there is a high differential stress which could lead to structural instability of the rock mass being excavated.

The microseismic method relies on observational data, amply demonstrated in laboratory experiments, that acoustic noise occurs in rocks subjected to high differential stresses. Acoustic emission becomes most pronounced as the breaking strength of the rock is reached. Laboratory studies have shown that the acoustic emission is linked with the release of stored strain energy as the rock mass undergoes small-scale adjustments such as the formation of cracks. Studies in actual mines have shown that acoustic noises often precede failure of rock masses in rock bursts or in coal bumps. Seismologists are, therefore, very interested in whether these results can be applied to large-scale failures; that is, earthquakes. An active research program in predicting rock bursts in mines is being conducted by Brian T. Brady and his colleagues at the U.S Bureau of Mines, Denver Colo.  

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Predicting rock bursts in mines
Series title Earthquake Information Bulletin (USGS)
Volume 11
Issue 3
Year Published 1979
Language English
Publisher U.S Geological Survey
Description 6 p.
First page 89
Last page 94
Online Only (Y/N) N
Additional Online Files (Y/N) N