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Evaluation for Rock Cleavage Using Distribution of Microcrack Lengths
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 Title & Authors
Evaluation for Rock Cleavage Using Distribution of Microcrack Lengths
Park, Deok-Won;
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 Abstract
Jurassic granite from Geochang was analysed with respect to the characteristics of the rock cleavage. The phases of distribution of microcracks were well evidenced from the enlarged photomicrographs() of the thin section. In this study, the length - cumulative frequency diagrams were used for expressing the distribution characteristics of microcrack. The diagrams for the six directions were arranged in the magnitude of density(). These diagrams show an order of H2 < H1 < G2 < G1 < R2 < R1 from the related chart. Among six diagrams, the diagram for hardway 2(H2) occupies the lowermost region on the left. On the contrary, the diagram for rift 1(R1) occupies the uppermost region on the right. Curve patterns of the two diagrams change from uniform to exponential distribution type in accordance with the increased density. The overall distribution characteristics of the diagrams were well evidenced from the magnitude of the exponent() and length of line oa related to the exponential straight line. The magnitude of exponent governing the values of slope() is inversely proportional to the values of microcrack parameters such as number(N), length(L) and density. On the contrary, length of line oa is directly proportional to the values of the above three parameters. Above microcrack parameters related to the order of arrangement of diagrams show an order of hardway(H1 + H2) < grain(G1 + G2) < rift(R1 + R2). The distribution characteristics of progressive variation are found among the six diagrams. The order of arrangement of the diagrams indicates a relative magnitude of the rock cleavage. Meanwhile, the parameters such as slope, exponent, density and length of line oa were arranged in an order of H2 < H1 < G2 < G1 < R2 < R1. The variation curves of a smooth quadratic function are shown from the related chart. From the correlation chart between density and the above parameters, a common regularity following power-law correlation function was derived. Finally, the analysis for the rock cleavage was conducted through the combination between the diagram and microcrack parameter. This type of combination contribute to the progressivity in evaluation for the rock cleavage.
 Keywords
Jurassic granite;rock cleavage;enlarged photomicrograph;length - cumulative diagram;exponential straight line;microcrack parameters;
 Language
Korean
 Cited by
1.
"석재, 골재, 문화재 분야에서의 암석의 활용" 특별호를 발간하며,홍세선;

암석학회지, 2015. vol.24. 3, pp.149-151 crossref(new window)
1.
Evaluation for Rock Cleavage Using Distribution of Microcrack Spacings (III), The Journal of the Petrological Society of Korea, 2016, 25, 4, 311  crossref(new windwow)
2.
Evaluation for Rock Cleavage Using Distribution of Microcrack Spacings (I), The Journal of the Petrological Society of Korea, 2016, 25, 1, 13  crossref(new windwow)
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Evaluation for Rock Cleavage Using Distribution of Microcrack Spacings (II), The Journal of the Petrological Society of Korea, 2016, 25, 2, 151  crossref(new windwow)
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Editorial : 2015, Applied petrology: Dimension stone, Aggregate, Stone cultural heritage, The Journal of the Petrological Society of Korea, 2015, 24, 3, 149  crossref(new windwow)
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