Abstract Retaining structures are required to evaluate their stability not only during construction but also during maintenance. In this paper, the retaining structure was constructed after excavating the slope for the tunnel construction. In order to evaluate the stability of a large-scale retaining structure, laser scanning was applied to monitor the behavior of the retaining structure. Since the retaining structure is composed of zigzag-shaped concrete panels, two scans were performed at six locations to minimize the shadow effect in a zigzag-shaped concrete panel. Various factors such as point cloud comparison methods, distance between structure and scanner, scanning angle, density of point cloud, cloud registration and reference target affect to the comparison of point clouds and hence the influence of these factors on the accuracy of point cloud analysis were determined. Scanning was performed every summer and winter for four years, and the behavior of the retaining structure according to the seasonal effect could be analyzed by comparing the collected point clouds.

中文翻译：

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挡土结构锯齿形混凝土面板激光扫描长期监测及影响因素分析

摘要 挡土结构不仅在施工过程中需要对其稳定性进行评估，而且在维护过程中也需要对其稳定性进行评估。在本文中，挡土结构是在开挖边坡后建造的，用于隧道施工。为了评估大型挡土结构的稳定性，应用激光扫描来监测挡土结构的行为。由于挡土结构由锯齿形混凝土板组成，因此在六个位置进行了两次扫描，以尽量减少锯齿形混凝土板的阴影效应。点云比较方法、结构与扫描仪之间的距离、扫描角度、点云密度、云配准和参考目标对点云比较的影响，从而确定这些因素对点云分析精度的影响。每年夏季和冬季进行四年扫描，通过比较收集的点云，可以分析挡土结构根据季节效应的行为。