Abstract
Stability 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.
