Traditional monitoring systems are not able to monitor the global behavior of large retaining structures, and terrestrial laser scanning was performed for monitoring a retaining structure for this paper. The three-dimensional point cloud was obtained by scanning at seven locations with seven reference targets to cover the retaining structure having 180 m length and 25 m high. To evaluate the long-term behavior of the retaining structure, point clouds obtained by performing eight laser scanning at the same locations over 4 years were compared with each other. In this paper, the tilt mapping method was applied to define the global behavior of the entire retaining structure. The P2P-TA (Plane-to-Plane-Tilt Angle) comparison method was used to calculate the tilt angle by comparing the normal vectors of the planes created by the point clouds, because simple comparison methods are not able to be applied to compare points clouds of zigzag-shaped concrete panels. A laboratory test was conducted to determine the applicability of laser scanning and P2P-TA analysis, and the error range was conservatively set to 0.15°. The results of laser scanning and P2P-TA analysis applied to 231 concrete panels are shown in the tilt mapping of the retaining structure. The differential tilt angle was significantly increased every year at the bottom of the concrete panel adjacent to the tunnel. It can be seen that the concrete panel having a large differential tilt angle affects the differential tilt angles of others, because it is linked to other concrete panels.

传统的监视系统无法监视大型保持结构的整体行为，因此本文对地面进行了激光扫描以监视保持结构。三维点云是通过使用七个参考目标在七个位置扫描以覆盖长度为180 m和高度为25 m的保持结构而获得的。为了评估保持结构的长期性能，将通过在4年内在相同位置进行八次激光扫描而获得的点云进行了比较。在本文中，倾斜映射方法被用来定义整个保持结构的整体行为。P2P-TA（平面到平面倾斜角）比较方法用于通过比较由点云创建的平面的法向矢量来计算倾斜角，因为无法使用简单的比较方法来比较之字形混凝土面板的点云。进行了实验室测试以确定激光扫描和P2P-TA分析的适用性，并且将误差范围保守地设置为0.15°。固定结构的倾斜图显示了对231个混凝土面板进行激光扫描和P2P-TA分析的结果。邻近隧道的混凝土面板底部的倾斜角每年都显着增加。可以看出，具有较大的倾斜倾角的混凝土面板会影响其他倾斜面板的倾角，因为它与其他混凝土面板相连。进行了实验室测试以确定激光扫描和P2P-TA分析的适用性，并且将误差范围保守地设置为0.15°。固定结构的倾斜图显示了对231个混凝土面板进行激光扫描和P2P-TA分析的结果。邻近隧道的混凝土面板底部的倾斜角每年都显着增加。可以看出，具有较大的倾斜倾角的混凝土面板会影响其他倾斜面板的倾角，因为它与其他混凝土面板相连。进行了实验室测试以确定激光扫描和P2P-TA分析的适用性，并且将误差范围保守地设置为0.15°。固定结构的倾斜图显示了对231个混凝土面板进行激光扫描和P2P-TA分析的结果。邻近隧道的混凝土面板底部的倾斜角每年都显着增加。可以看出，具有较大的倾斜倾角的混凝土面板会影响其他倾斜面板的倾角，因为它与其他混凝土面板相连。邻近隧道的混凝土面板底部的倾斜角每年都显着增加。可以看出，具有较大的倾斜倾角的混凝土面板会影响其他倾斜面板的倾角，因为它与其他混凝土面板相连。邻近隧道的混凝土面板底部的倾斜角每年都显着增加。可以看出，具有较大的倾斜倾角的混凝土面板会影响其他倾斜面板的倾角，因为它与其他混凝土面板相连。