Abstract
The 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.
