A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Deformation Monitoring of Underground Openings by Photographic Techniques
A photographic method for measuring deformation of rock surfaces in underground excavations has been developed and successfully demonstrated. The system uses 35mm photography of targets located on surfaces of interest. The optimum target was determined to be a white 'X' on a black 6-inch square; the 'X' being made from 1/8-inch-wide reflective tape. Pairs of photos were taken at regular time intervals from two separated camera positions to provide three-dimensional displacement data. The photos were analyzed and test results showed that the claim of better than plus or minus 0.20-inch accuracy in a mine drift 20 feet wide can be expected.
Deformation Monitoring of Underground Openings by Photographic Techniques
A photographic method for measuring deformation of rock surfaces in underground excavations has been developed and successfully demonstrated. The system uses 35mm photography of targets located on surfaces of interest. The optimum target was determined to be a white 'X' on a black 6-inch square; the 'X' being made from 1/8-inch-wide reflective tape. Pairs of photos were taken at regular time intervals from two separated camera positions to provide three-dimensional displacement data. The photos were analyzed and test results showed that the claim of better than plus or minus 0.20-inch accuracy in a mine drift 20 feet wide can be expected.
Deformation Monitoring of Underground Openings by Photographic Techniques
J. R. McVey (author) / S. R. Lewis (author) / E. E. Guidice (author) / J. R. Powell (author)
1974
31 pages
Report
No indication
English
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