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| Research on the Detection Method of Tunnel Under - over Break Using Point Cloud |
| XU Lei1，WANG Chang - jin2 |
| (1. Wuhan University，Wuhan，Hubei 430079，China; 2. The Third Railway Survey and Design Institute Group Corporation，Tianjin 300251，China) |
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Abstract Abstract:Research purposes: As an important underground structure， tunnel detection is a frequency jobs during construction stage，which evaluates the construction quality and the stability of surrounding rock. Current traditional technologies that using total station and profile measurement instrument is time consuming. Based on terrestrial laser scanner，the new detection method is efficient and accurate. This paper proposed novel approach to detect tunnel under -over break using laser scanning cloud. Research conclusions :( 1) Detection of tunnel under - over break with three - dimensional laser point cloud can achieve high efficiency and high precision at the same time. (2) As the discrete point cloud data is organized based on KD tree algorithm，filtered using radius search method and rectangle algorithm，section point cloud can be segmented very quickly. (3 ) The under - over break area statistics based on polygon intersection algorithm，can be used to under - over break detection in a variety of tunnels. (4) The new method is characterized by reliable precision and wide universality， and can fulfill t!ie requirement of tunnel under - over break on construction stage.
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Received: 05 September 2016
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2016, Vol. 33 
