Use of Subaudible Noises For Prediction of Rock Bursts.
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Use of Subaudible Noises For Prediction of Rock Bursts.

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Published by s.n in S.l .
Written in English


Book details:

Edition Notes

1

SeriesReport of investigations (United States. Bureau of Mines) -- 3555
ContributionsObert, Leonard, 1906-
ID Numbers
Open LibraryOL21749665M

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Additional Physical Format: Online version: Obert, Leonard, Use of subaudible noises for prediction of rock bursts. Washington, D.C.: U.S. Dept. of the Interior. Use of subaudible noises for the prediction of rock bursts. Part II. (OCoLC) Material Type: Document, Government publication, National government publication, Internet resource: Document Type: Internet Resource, Computer File: All Authors / Contributors: Leonard Obert; Wilbur I Duvall; United States. Bureau of Mines. Download PDF: Sorry, we are unable to provide the full text but you may find it at the following location(s): (external link) http Author: Leonard Obert. Acoustical monitoring of rock specimens during cyclic compression tests has allowed recognition of similar patterns of behavior for dissimilar types of rock. During first loading of sandstone and quartz diorite cylinders, oscillations in the audio-frequency range emanate from the .

As long ago as , Dr. E. A. Hodgson of the Dominion Observatory, Ottawa, proposed the use of subaudible noises for the prediction of earthquakes. Mines had long been known to 'talk' or emit audible noises, but it was not until that, on the suggestion of C. F. Jackson, then Chief of the Mining Division of the United States Bureau of. ri / use of subaudible noises for prediction of rock bursts, pb, $ 5 ri / froth flotation and agglomerate tabling of micas, pb, $ 25 ri / progress reports - metallurgical division microscopic studies, pb, $ 12 ri / progress report metallurgical division ore-testing studies, , pb, $ Book. Jan ; B.H.G. Brady Use of subaudible noises for prediction of rock bursts— Part II, BuMines, RI Jan ; L Obert; Obert L. Use of subaudible noises for prediction of rock.   Lecture on rock bursts 1. Page 1 of 12 Rock Bursts: Causes, Mitigating Measures and Monitoring INTRODUCTION Mining depth is increasing day by day, since the deposits near the surface are mined out. Going deep in the mine creates different conditions in comparison with the near surface mining due to the increased stress.

Purchase Rockburst - 1st Edition. Print Book & E-Book. ISBN , ("access") the repeater. Most repeaters are open -- that is, available for use by anyone in range. Some repeaters, however, have limited access. Their use is restricted to exclusive groups, such as members of a club. Such closed repeaters require the transmission of a continuous subaudible tone or a short "burst" of tones for access. 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. United States Bureau of Mines Report of Investigations Use of subaudible noises for the prediction of rock bursts, part II. By Leonard Obert and Wilbur Duvall. 22p., illus. (rust marks at spine, no cover sheet) $2.