Research on Interpretation Method of Rocky Slope Fissure Aperture Based on Aerial Shadow Measurement Technology
The aperture diameter of natural rock fissures has a significant effect on the deformation and strength characteristics of the rock body as well as the hydrodynamic characteristics of the fissured rock body,while the traditional measurement methods are not accurate enough for data collection of high steep rocky slopes in complex mountainous areas.In order to address this problem,the high-resolution three-dimensional model of rock slope is established through the UAV multi-angle object photogrammetry technique,the characteristic points of crack edges are obtained,the crack opening morphology is characterized with the help of coordinate projections and transformations,and the vertical measurement line is used to determine the central axis of the crack,and the aperture is interpreted according to the shape of the crack.The feasibility and reliability of the method is verified by taking a railroad construction site in Shanxi Province as an example,and the study shows that the crack aperture has significant interval effect and size effect,and the optimal sampling length of the crack is about 0.5～1 m.The best aperture interpretation results can be obtained when the spacing of the measurement line is 1%of the sampling length,and meanwhile,the distribution of aperture in cracks of different orientations varies to a certain extent,but it generally obeys the normal,lognormal,and gamma normal distributions.
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