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Effects of Water Saturation on Acoustic Wave Velocity.

Authors
Thill-RE; Jessop-JA
Source
Soc Min Eng AIME Preprint 86-148 1986 :13 pages
Link
NIOSHTIC No.
10005235
Abstract
An ultrasonic pulse-immersion apparatus and method are described for determining the effects of moisture on the dynamic elastic properties of rock. The method provides an alternative approach for assessing the moisture sensitivity of rocks. Ultrasonic wave velocities are continuously monitored in immersed rock samples as a function of water absorption and time up to saturation. Moisture effects on compressional wave velocity vary as a function of the type of rock and the time and amount of waer absorption. Regression analyses are used to curve-fit plots of the data and to derive empirical expressions for compressional wave velocity as a function of water content for different categories of rock. Results indicate that compressional wave velocity can be used to predict both the moisture content and its effect on strength and deformational properties of rock. These results have potential for detecting or monitoring bad roof conditions in situations where the mine rock exhibits strength degradation with moisture absorption.
Publication Date
19860101
Document Type
OP;
Fiscal Year
1986
NTIS Accession No.
NTIS Price
Identifying No.
OP 91-86
NIOSH Division
TCRC;
Source Name
Soc. Min. Eng. AIME Preprint 86-148, 1986, 13 Pp
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