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Estimation of shear strength using fractals as a measure of rock fracture roughness.

Authors
McWilliams-PC; Kerkering-JC; Miller-SM
Source
Spokane, WA: U.S. Department of the Interior, Bureau of Mines, RI 9447, 1993 Jan; :1-36
NIOSHTIC No.
10003266
Abstract
Researchers at the U.S. Bureau of Mines investigated the use of close-range photogrammetry and subsequent stereo digitizing to obtain data from rock fracture roughness profiles. The photogrammetric process yielded results that were acceptable but somewhat inferior to those obtained by a mechanical profilometer. On the basis of this study, further pursuit of photogrammetry as a data collection method in mining is proposed. Fractal geometry was investigated as a means of measuring the roughness of rock fracture profiles. Four fractal algorithms were used: divider method, modified divider method, box method, and spectral method. A comparison of the methods gave ambiguous results. Brown's modified divider method provided the best means of obtaining the fractal dimension. Shear strength estimates were obtained using the parameters of the modified divider method and Myers' Z2 measure. Because of differences in results when comparing the different ways of obtaining the fractal dimension, future users of fractals in studies of rock fractures are advised to cross-check their results carefully.
Keywords
Mining-industry; Underground-mining; Geology; Mathematical-models; Computer-software; Simulation-methods
Publication Date
19930101
Document Type
Report of Investigations
Fiscal Year
1993
NTIS Accession No.
PB93-189587
NTIS Price
A03
Identifying No.
RI-9447
NIOSH Division
SRC
Source Name
Spokane, WA: U.S. Department of the Interior, Bureau of Mines, RI 9447
State
WA
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