Tunnel Cross Section Extraction and Deformation Analysis Based on Mobile Laser Scanning Technology

doi:10.13474/j.cnki.11-2246.2018.0177

Abstract

Abstract: Mobile laser scanning technology has the advantage of fast data acquisition,high density and high precision,in addition,it doesn't need to stitch the adjacent station after scanning.Based on mobile laser scanning data,the method of tunnel deformation detection and analysis is studied.Firstly,the spatial central axis of the tunnel is calculated by combining the boundary detection algorithm with random sampling consistency algorithm,and the rotation process of a large number of point clouds in traditional method is eliminated.Secondly,the k-nearest neighbor method is used to compute the buffer of each section to block the point clouds,and the sectional point sets are automatically constructed by projection method,increased the calculation speed of cross sections.Finally,an iterative elliptic fitting method is proposed to denoise the cross sections and fit the sectional curve lines.The precision of the method is verified by comparing with cross section obtained by total station.The proposed method is applied on a section of circular shield tunnel,which is intercepted into cross sections in the interval of 2 m based on the point clouds obtained by tunnel scan,and deformation analysis is performed by comparing the cross sections with theoretical one.

Key words: mobile laser scanning, tunnel, deformation, central axis, cross section

CLC Number:

P258

DU Liming, ZHONG Ruofei, SUN Haili, ZHU Qiang, ZHANG Zhen. Tunnel Cross Section Extraction and Deformation Analysis Based on Mobile Laser Scanning Technology[J]. 测绘通报, 2018, 0(6): 61-67.

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