The measurement of displacement is an important factor to evaluate the stability of a retaining structure. In this paper, a large-scale retaining structure with a width of 70 m and a height of 6 m was monitored using 3-D laser scanning. Displacement mapping was proposed to globally monitor the entire retaining structure. The point cloud obtained immediately after the excavation was converted into the mesh, and the point clouds obtained on the second and seventh days after excavation were compared to the mesh using the Cloud to Mesh (C2M) comparison method. Since the C2M displacement can be underestimated in the inclined section of the sheet pile, after filtering using the azimuth and element angles automatically, only the flat sections of the sheet pile can be segmented from original point clouds collectively and consistently. The displacement mapping results identify not only the local behavior of the sheet pile, such as the bending point and the maximum displacement position, but also the global behavior, such as the expansion of the maximum displacement in the retaining structure. The results of the displacement mapping were confirmed through site investigation as well. In the displacement mapping result, the maximum displacement was found around rows 2 and 3 of the 37th sheet pile, and the analyzed result of the load cell installed on the anchor indicated that the anchor constructed in the 37th sheet pile shows the plastic behavior. It was established that other sheet piles are affected by the damage to the local anchor through the H-beam and the maximum displacement in the displacement mapping is expanded horizontally in a positive parabola shape. Therefore, it was confirmed that displacement mapping using laser scanning can complement existing monitoring techniques and can contribute to evaluating the behavior of a large-scale retaining structure during excavation.

位移的测量是评估保持结构稳定性的重要因素。在本文中，使用3-D激光扫描对宽度为70 m，高度为6 m的大型保持结构进行了监测。提出了位移映射以全局监视整个固定结构。将开挖后立即获得的点云转换为网格，并使用云到网（C2M）比较方法将开挖后第二天和第七天获得的点云与网格进行比较。由于可以在板桩的倾斜部分中低估C2M位移，因此在自动使用方位角和元素角度进行滤波后，只有板桩的平坦部分才能从原始点云中集中一致地进行分割。位移映射结果不仅可以识别板桩的局部行为（例如弯曲点和最大位移位置），还可以识别整体行为（例如最大位移在固定结构中的扩展）。位移测绘的结果也通过现场调查得到了证实。在位移映射结果中，在第37个板桩的第2行和第3行附近发现了最大位移，对锚上安装的测力传感器的分析结果表明，在第37个板桩中构造的锚具有塑性行为。可以确定，其他板桩也受到H形梁对本地锚的破坏的影响，并且位移映射中的最大位移以正抛物线形状水平扩展。所以，