基于隧道水平中线的全局断面提取及形变分析

doi:10.13722/j.cnki.jrme.2020.0037

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Abstract Based on the horizontal centerline(HC) of tunnel，an automatic extraction and deformation analysis method of tunnel cross-section information is proposed. Firstly，the point cloud data of tunnels are projected horizontally to extract the horizontal centerline. Considering the influence of the tunnel adjuncts and the absence of point cloud data on the accuracy of the HC extraction，a sliding window robust fitting method is proposed to extract the HC accurately. Then，the cross-section of the tunnel is extracted and the points of the central axis are fitted. Finally，the radial displacement of each part of the tunnel is calculated according to the central axis points and the design values. The overall deformation of the tunnel can be described intuitively through visual rendering. The results show that，with increasing the length of the tunnel，the fitting error of the HC of the tunnel by the traditional global fitting method gradually increases while tends to be stable by the sliding window robust fitting method，and that the sliding window robust fitting method can effectively avoid the horizontal centerline deviation caused by obstacles. After fitting the tunnel cross-sectional parameters according to the space circle model，the RGB color components are used to render the point cloud of the tunnel according to the radial displacement，which can reflect the deformation of the tunnel. The research work provides a basis for tunnel deformation monitoring.

Key words： tunnelling engineering 3D point cloud extraction of centerline sliding window robust fitting method tunnel cross section deformation monitoring

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	Articles by authors
	XU Fei1
	TIAN Maoyi1
	YU Jiayong1
	LIN Jingfeng1
	ZHOU Maolun2
	LI Guoyu2

Cite this article:

XU Fei1,TIAN Maoyi1,YU Jiayong1, et al. Global cross section extraction and deformation analysis of tunnels based on their horizontal centerlines[J]. , 2020, 39(11): 2296-2307.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0037 OR https://rockmech.whrsm.ac.cn/EN/Y2020/V39/I11/2296

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