Abstract：Abstract:Research purposes: During tunnel construction and operation, tunnel cross section must be measured often. The traditional method using total station or profile measure instrument is time - consuming. The current methods are based on cylinder and rectangletype of tunnel, which can not meet the demand of variety type of tunnel structural section measurement. This paper took substation scanning of the tunnel via ground - based laser scanner， then matched and fused the point cloud data of each scanning station. Prosing a new automatic structural section measuring algorithm can realize all types of structures'tunnel contour measuring task. Considering actual engineering project，we have tested the proposed method and accuracy.
Research conclusions ： ( 1) Realizing the automatic measurement of tunnel cross - section with three - dimensional laser point cloud data, this method can achieve high efficiency and high precision at the same time. (2) To organize the raw point cloud data based on octree algorithm and filter data noise using random sample consensus ( RANSAC ) algorithm.
Section cloud can be segmented using rectangle algorithm. Variety tunnel section can be automatically measured based on ray line intersection. （4) The research results can be used in tunnel structural section measuring， which is fitted the demand of variety tunnel section design type during construction and operation.
2016, Vol. 33 
版权所有 © 2014 《铁道工程学报》编辑部