Study on Roughness of Center Profile on Rock Fracture Surface Based on Statistics*

摘要

In order to research roughness of rock fracture surfaces whether to depend on scale effect, Brazil discs were fractured under tensile and compression stress in Brazil test with MTS (Mechanics Test Systems) and a laser profilometer was used to scan rock fracture surfaces. A figure of central profile was plotted through the scanned coordinates datum. A type of scale and a new concept about coefficient of deviating from normal distribution are defined to analyse the directional distribution of normal vector through statistics. Finally, some sample statistics are compared with other ones and a conclusion is reached that roughness of center profile depends on scale effect and the distribution of degrees more and more approximate normal distribution along with increase of scale.