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Volume 48 (2007 - 200･･･
- Issue 6 Pages 285-
- Issue 5 Pages 232-
- Issue 4 Pages 162-
- Issue 3 Pages 116-
- Issue 2 Pages 66-
- Issue 1 Pages 2-
Volume 48, Issue 3
Displaying 1-3 of 3 articles from this issue
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Yoshio UDAGAWA2007 Volume 48 Issue 3 Pages 116-125
Published: August 10, 2007
Released on J-STAGE: March 26, 2010
JOURNAL FREE ACCESSStability of a tunnel construction in cracked rock masses is affected in a characteristic of the geological feature such as both a crack and development degree of weathering. Therefore, it is very important from the viewpoint of construction of protection against disasters and economy of a tunnel to do appropriate geological feature evaluation of tunnel face. In this study, crack distribution of bedrock suggested the system, which evaluated the crack distribution situation of a face in a fractal dimension by fractal analysis of a tunnel face image with a digital camera in some tunnels execution stage from a thing having a fractal characteristic objectively. Furthermore, I applied this system to a tunnel executed the work in a sedimentary rock masses (sandstone / shale / conglomerate alternation), an igneous rock masses (granite) and a metamorphic rock masses (greenschist / blackschist) which were representative geological feature, and made the effectiveness of the geological feature evaluation and tunnel support pattern evaluation by this fractal analyses system to be clear.View full abstractDownload PDF (2288K) -
An Application of the Method Applied to the Mizunami Group at the Mizunami Underground Research LaboratoryHiroyuki MOCHIDA, Kenji AMANO, Tadahiko TSURUTA2007 Volume 48 Issue 3 Pages 126-131
Published: August 10, 2007
Released on J-STAGE: March 26, 2010
JOURNAL FREE ACCESSVarious engineering tasks, such as geological mapping and taking photographs, are required for geological investigations in tunnels. Generally these tasks are performed during brief interruptions of construction activities under less than ideal conditions. For instance, the quality of photographic images may be adversely affected by inconsistent lighting conditions and the quality of geological mapping depends greatly on the skills of the geologist. 3D laser-scanning techniques provide consistent quality images that are unaffected by ambient lighting conditions. Comparison of digitally processed images with manually prepared maps of the shaft wall in the Mizunami Group (Miocene age) were preformed. The 3D laser-scanning technique shows promise in making geological investigations in tunnels more accurate and efficient.View full abstractDownload PDF (2639K) -
Ryohei IMAMURA2007 Volume 48 Issue 3 Pages 132-140
Published: August 10, 2007
Released on J-STAGE: March 25, 2010
JOURNAL FREE ACCESSSince 1953, when Dr. Hiroshi KOIDE proposed the notion of “Immunity” against the disasters (landslides, slope failures, debris flows, etc.) in mountainous areas, the notion has broadly accepted in the fields of applied geology, debris control works etc. However, this term has been used without due adequate consideration for what it really means. This paper is threefold: first of all, it will be clarified that the validity of the “Immunity” completely depending on how much debris and/or water etc. are in the reservoir site that may fill valleys or slopes. Secondary, it will be suggested that the length of a period of the immunity is determined by both the quantity of stored debris etc. in the reservoir and the size of it.
Finally, it will be shown that the resistant to the “Immunity” should be discussed after defining the length of a time scale.View full abstractDownload PDF (1626K)
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