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Analysis of acoustic responses of domal salt mine samples.

Authors
Grau-RH III; Marshall-TE
Source
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9295, 1990 Jan; :1-9
NIOSHTIC No.
10007394
Abstract
The Bureau of Mines has developed an acoustic test for determining if a rock salt sample is from a "normal" nongassy salt face or from a gassy face where an outburst has the potential to occur. The test is based on the observation that a salt sample taken near an outburst-prone zone produces an audible popping sound when it is dissolved in water. The sound is produced when pressurized gas that is trapped in salt samples is released. In the acoustic test, the sound is electronically measured, digitized, and transmitted to a microcomputer; the output is an average decibel value that classifies the sample as "normal" or "outburst." The acoustic test procedure and equipment are described, and raw test results and data analysis are shown. Results are also shown for several salt samples that were analyzed using a laser raman microprobe.
Keywords
Gas-indicators; Gas-detectors; Gases; Acoustic-signals; Acoustical-measurements; Acoustics; Mining-equipment; Mining-industry; Ventilation; Underground-mining; Combustible-gases; Coal-mining
Publication Date
19900101
Document Type
IH; Report of Investigations
Fiscal Year
1990
NTIS Accession No.
PB91-110148
NTIS Price
A03
Identifying No.
RI-9295
NIOSH Division
PRC
Source Name
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 9295
State
PA
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