基于三维激光扫描技术的土石坝变形监测方法研究

由于土石坝结构复杂、非刚性等特点,受到外力作用时,各个部分变形呈现非线性变化,传统的单点监测存在一些局限性。提出了一种基于三维激光扫描技术的土石坝变形监测方法,将不同时期所采集的序列点云进行绝对定向完成坐标系统一,然后获取一组不同期的点云数据在同一位置处的剖面数据进行对比分析,监测大坝在水平与垂直方向的变形和位移。采用所提出的方法,在郑州市尖岗水库进行了试验,结果表明所提方法精度高,实时性强,能够满足水库大坝变形分析计算的要求。

Deformation monitoring of earth-rock dams based on three-dimensional laser scanning technology

The conventional method for deformation monitoring of earth-rock dams based on a single point cannot acquire enough information. It doesn’t consider the position and the relationship between points. It cannot accurately monitor the real and three-dimensional deformations of the earth-rock dams. Owing to their complex structure and non-rigid character, the earth-rock dams exhibit irregular deformation when subjected to external force. So a new method for dam deformation monitoring based on three-dimensional laser scanning point cloud data is proposed. First, the absolute orientation is implemented for the point cloud data series collected at different time, allowing that the post-possessing can be performed in a unified coordinate system. Then, the cross-section point cloud data series at the same location collected at different time are compared and analyzed to figure out the dam deformation and displacement in horizontal and vertical directions. Jiangang Reservoir in Zhengzhou City is chosen to verify the accuracy and efficiency of the proposed dam deformation monitoring method. The experimental results show that the proposed method is highly accurate and real-time, and can meet the requirements of dam deformation analysis.