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Deformation Monitoring of Underground Openings by Photographic Techniques.

Authors
McVey-JR; Lewis-SR; Guidice-EE; Powell-JR
Source
NTIS: PB 234 064 :26 pages
Link
NIOSHTIC No.
10000900
Abstract
A new method for measuring deformations of rock surfaces in underground excavations has been suggested by Dr. James Powell of Brookhaven National Laboratories (BNL) and subsequently developed and successfully demonstrated in a mining environment by the federal Bureau of Mines Spokane Mining Research Center (SMRC) and Brookhaven National Laboratories. The system uses 35-mm photography of targets strategically located on surfaces of interest, such as across the roof and on the sides of a mine drift or tunnel. The optimum target, as determined in this investigation, consists of a white "x" made with 1/8-inch-wide reflective tape on a black 6-inch square. Photographs, taken in pairs from two separated camera positions and at regular time intervals, were analyzed at the Bureau by hand and at Brookhaven National Laboratories using techniques and equipment similar to those used in cloud chamber film analysis. Test results show that deformation-measurement accuracies of better than +/-0.020 Inch in a drift that is 20 feet wide can be expected. This degree of accuracy, plus providing displacement data in the x, y, and z directions (rather than the one direction formerly possible), makes this a noteworthy and useful tool for industry as well as for mining research.
Publication Date
19740101
Document Type
IH; Report of Investigations
Fiscal Year
1974
NTIS Accession No.
PB-234064
NTIS Price
A03
Identifying No.
RI 7912
NIOSH Division
SRC;
Source Name
NTIS: PB 234 064
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