2007 年 3 巻 1 号 p. 31-36
Fractures parallel to rift, grain and hardway planes of Inada granite were produced by a uni-axial tensile test. The obtained surface topography was analyzed by digital stereo-photogrammetry. A pair of photograph was taken by a digital camera with a macro lens mounted on a copy stand system. The measurement accuracy is about 0.02 mm parallel to the fracture surface, and 0.1 mm in the vertical direction, for the specimen of 30 mm diameter. From the results of calculation of roughness parameter, the fracture parallel to the rift plane is the smoothest, and the fracture parallel to the grain plane is smoother than the fracture parallel to the hardway plane.In addition, we discussed the applicability of the digital photogrammetric technique to other geo-engineering and geological objects.
