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Use of Acoustic Velocity for Predicting Stress Under Uniaxial Compression.

Authors
Radcliffe-KS; Thill-RE; Jessop-JA
Source
Soc Min Eng Ame Preprint 86-147 1986 :11 pages
Link
NIOSHTIC No.
10005230
Abstract
This report presents results for the first phase of an experimental program to study the feasibility of using acoustic velocity for predicting the state of stress in a rock mass. Compressional wave velocities were determined axially in cylindrical samples during uniaxial compression for several rock types conditioned in dry and water-saturated environments. Results indicate that in rocks containing compressible voids or cracks, substantial velocity change occurs with the application of stress in the lower (below 100 mpa) stress regime. The effect is normally nonlinear, however, and diminishes to asymptotic values when cracks or voids become closed, or with saturation. Empirical prediction equations were derived for each rock type by linear and nonlinear regression analyses, and correlation coefficients were calculated to determine the equations that best fit the stress-velocity data. The operational range for predicting stress using compressional wave velocity appears to be within the range of vertical stress expected in most shallow to intermediate depth mining operations (less than 1,000 m). Based on the experimental results to date and on theoretical considerations, it appears that the technology can be advanced to predict in situ stress based on acoustic p-wave velocity determinations in most mining situations.
Publication Date
19860101
Document Type
OP;
Fiscal Year
1986
NTIS Accession No.
NTIS Price
Identifying No.
OP 87-86
NIOSH Division
TCRC;
Source Name
Soc. Min. Eng. Ame Preprint 86-147, 1986, 11 Pp
State
MA;
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