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Volume 32, Issue 3
Displaying 1-4 of 4 articles from this issue
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Yasuhito SASAKI, Masahiko ABE, Isamu HIRANO1991 Volume 32 Issue 3 Pages 99-109
Published: August 10, 1991
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSA new method to describe the regional characteristics on slope failure size-number distribution is proposed in terms of its Fractal properties.
The investigation area was 26.5km (N-S direction) long and 1km (E-W) wide through Misumi Town in Shimane Prefecture, in which psammitic and pelitic schists of Sangun Metamorphic Rocks are mainly distributed. Slope failures investigated occurred in the morning of the 23th in July 1983 by heavy rainfall concentrated in Misumi and Masuda areas. The relationships of the failure size (maximum width) -number distribution and the amount of rainfall, geographical, geological and botanical properties were investigated.
The results are summarized as follows.
1) The failure size (wider than 15m) -number distribution showed Fractal Distribution.
2) Coefficient D (Fractal Dimension, tangent of approximated line on the log-log graph.) is a parameter that indicates the ratio of the number of small/large failures. D in the whole investigated area was about 3.3 and varied with geology and vegetation; D was higher in the psammitic schist area than in the pelitic schist area, and was higher in the area of needle-leaf tree woods than in that of broad-leaf tree woods.
3) D and D′ (Fractal Dimension of the contour line in the investigated area) had positive correlation, but D was not influenced by the amount of rainfall that caused the investigated failures.
4) Coefficient α0 (number of failures wider than 1m per 1km2) is a parameter that indicates the slope in stability and was influenced by rainfall, geology, and vegetation.
5) The Fractal properties on slope failure size-number distribution could be used for the prevention of slope disasters, estimation of erosion volume, explanation of variety of failure type.View full abstractDownload PDF (2000K) -
Fumio SUGIMOTO, Mitsumasa FURUZUMI, Mamoru ABE1991 Volume 32 Issue 3 Pages 110-116
Published: August 10, 1991
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSThe topography of rock fracture surfaces created by Brazilian tests and direct shear tests is investigated as a fundamental study on the roughness of joint surface. The roughness is measured with the profilometer built up as a trial. The spectral analysis is done on the profiles of surfaces, and then various roughness parameters of those profiles are estimated.
The whole and the magnified portion of profile on rock fracture surfaces show a similar form. Also, the power spectral density increases linearly with wavelegth on the log-log graph. Therefore, it is found that the profile of fractured rock surface obeys fractal.
Fractal dimension and various roughness parameters of fracture surface are different with rock type and fracture condition. Also, it is not shown that the correlations exist between fractal dimension and each roughness parameter.View full abstractDownload PDF (777K) -
Hiroshi FURUBE1991 Volume 32 Issue 3 Pages 117-119
Published: August 10, 1991
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSDownload PDF (350K) -
Kazukuni KIMIYA1991 Volume 32 Issue 3 Pages 120-129
Published: August 10, 1991
Released on J-STAGE: February 23, 2010
JOURNAL FREE ACCESSDownload PDF (1511K)
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