A method for measuring the angularity of gravel particle surfaces based on 3D laser scanning

Abstract

The invention discloses a method for measuring the angularity of the surface of crushed stone particles based on three-dimensional laser scanning, comprising the following steps: S1: using a laser scanner to obtain three-dimensional point cloud data on the surface of crushed stone particles, and preprocessing the three-dimensional point cloud data , to obtain the point cloud model; S2: Obtain the dimensionless mean square root curvature of each point cloud in the point cloud model, and determine the relative frequency fitting curve of the dimensionless mean square root curvature; S3: Determine the minimum curvature radius point in the relative frequency fitting curve Corresponding curvature; S4: Determine the surface edge angle of gravel particles according to the number of point clouds whose curvature is greater than the point corresponding to the minimum curvature radius. According to the gravel edge angle determined by the invention, the measurement result is accurate, reliable, and the method is simple, and a large number of gravel particle samples can be quickly measured in a short time, and the results can be fed back to the production and material selection 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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