特殊土・その他

[III-352] Influence of sampling resolution on joint roughness evaluation employed two different methods

〇Jintong Zhang¹, Kiyoshi Kishida¹ (1.Kyoto University)

Keywords:joint roughness, root mean square, initial surface, sheared surface, profiling resolution

This paper adopts both low- and high-resolution sampling machines that are laser scanner and pattern projection, respectively, to digitize the entire granite joint surfaces. As a result, it is confirmed that the Z₂ value of each profiling line obtained from pattern projection, compared with the laser scanner, is closer to the average Z₂ value. In addition, both two kinds of profiling data show that 1.0 mm sampling interval is the most appropriate to evaluate the joint roughness of initial granite surface. For the sheared joint surface, the declining trend of JRC values is observed only in the high-resolution digital data. However, neither of them can accurately predict JRC values of the sheared surface.