Structural Surface Roughness Based on UAV High Density Point Cloud Fractal Characteristics and Anisotropy
Song Shengyuan
Liu Dianze
Li Baotian
Zhao Mingyu
Yang Ze
Huang Di
Wang Sicong
Abstract：To study the influence of anisotropy of rock mass structural plane on roughness evaluation,taking the rock mass on the high and steep slope of a railway Chada site in southeast Tibet as the research object,the integrated photogram technology of unmanned aerial vehicle was used to extract the high-density point cloud of the structural plane in the study area and cut the outline of the structural plane.The roughness coefficient JRC and fractal dimension D were calculated by the modified straight edge method and the box dimension method respectively.The new JRC and D formulas are fitted and verified by digital Barton standard lines.15 structural planes formed under shear and tension were selected and the new formula was used to calculate the JRC in large quantities.The results show that the shear surface roughness is anisotropic,and the JRC is smaller along the shear direction,larger along the vertical shear direction,and the fluctuation with sampling angle is small.The tensile surface roughness also has anisotropy but no obvious rule,and JRC fluctuates greatly with sampling angle.It is proved that the JRC anisotropy of structural planes with different mechanical origin is also different,and different sampling rules should be followed when evaluating roughness.
Keywords：UAVintegrated photogrammetryhigh density point cloudstructural surface roughnessfractal dimensionanisotropyengineering geology
Publication Date：2025-04-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：13( 1599-1611 )