ISSN 2096-4498
CN 44-1745/U
Tunnel Construction ›› 2017, Vol. 37 ›› Issue (7): 794-802.DOI: 10.3973/j.issn.1672-741X.2017.07.003
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YOU Xiangjun1, CHENG Jun2
Received:
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Abstract:
A new, fast, accurate and fullface deformation detection method based on highdensity 3D laser scanning technology, tunnel scanning and measuring system Tunnelscan, is introduced. The absolute positioning method (APM) of point cloud is used to register multiple scans and transfer the tunnel control coordinate system to them. The least square method based on minimum distance from crosssection points is used to calculate the center point of crosssection. A ringshape point cloud filter based on the distance difference from the measured crosssection and the referenced crosssection is applied to remove the noisy points that are actually not on the tunnel wall. The multiple loops of this ringshape filtering and center point calculation will be executed to get the refined center points and crosssection points of proper circular tunnel constructed by TBM method. It can also offer a new type of user report based on orthophoto of tunnel by laser intensity direction and ranging (LIDAR) of overall tunnel wall, which can provide a quick and big picture of tunnel diseases, such as crosssection deformation, structure clearance alarm, cracks or leakages, etc, using referenced crosssection contour projection method. A real 3D scanning asbuilt survey test in Majie StationMianshan Station section on Kunming Metro Line No.3 is carried out. With the abovementioned colorful overall tunnel map on the crosssection deformation analysis, much effort can be saved to find out those crosssection charts with large deformation. Apart from that, the analysis with orthophoto of tunnel is much more visual than that directly with 3D tunnel point cloud or that with 3D model for the shelter of visual angle.
Key words: tunnel, deformation detection of crosssection, laser scanning, tunnel axis measuring, absolute positioning method of point cloud, orthophoto of tunnel by laser intensity direction and ranging (LIDAR), tunnel disease
CLC Number:
U 456.3
YOU Xiangjun, CHENG Jun. Study of a New Proper Circular Tunnel Crosssection Deformation Detection Method Based on 3D Laser Scanning Technology[J]. Tunnel Construction, 2017, 37(7): 794-802.
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http://www.suidaojs.com/EN/Y2017/V37/I7/794
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