Gravel particle surface edge angle measurement method based on three-dimensional laser scanning

Abstract

The invention discloses a gravel particle surface edge angle measurement method based on three-dimensional laser scanning, and the method comprises the following steps: S1, obtaining the three-dimensional point cloud data of the surface of a gravel particle through a laser scanner, and carrying out the preprocessing of the three-dimensional point cloud data, and obtaining a point cloud model; S2, obtaining a dimensionless mean square root curvature of each point cloud in the point cloud model, and determining a relative frequency fitting curve of the dimensionless mean square root curvature; S3, determining a curvature corresponding to a minimum curvature radius point in the relative frequency fitting curve; and S4, according to the number of the point clouds with the curvature larger than the curvature radius point corresponding to the minimum curvature radius point, determining the surface angularity of the gravel particles. According to the gravel corner angle determined by the method, the measurement result is accurate and reliable, the method is simple and convenient, a large number of gravel particle samples can be rapidly measured in a short time, and the result is fed back to the production and sorting process in time.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and in particular relates to a three-dimensional laser scanning-based method for measuring the angularity of the surface of gravel particles. Background technique [0002] Crushed stone aggregates are widely used in civil engineering construction, and can be used as the main filler for structures such as railway ballast and roadbed, highway pavement and dam body. Similar to the strength and gradation of crushed stone aggregates, the shape of crushed stone particles is one of the important factors affecting the macroscopic properties of aggregates, involving particle contour shape, angularity, and surface texture (roughness). After compaction, the positional relationship between crushed stone particles determines the intercalation state and pore structure of the accumulation, which in turn affects the shear strength, compaction performance, and permeability characteristics of the ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of insufficient angularity measurement of crushed stones, and propose a method for measuring the angularity of the surface of crushed stone particles based on three-dimensional laser scanning

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