摘要
水工建筑物的混凝土磨蚀监测是水利工程中的重点和难点。随着技术的进步,现有的混凝土磨蚀监测手段得到长足的发展,但依然存在监测范围小、难以全面反映磨蚀破坏程度等问题。三维激光扫描技术由于具有精度高、抗干扰能力强等特点,被越来越多地应用到高精度工程测量和三维建模中,但将其应用于混凝土磨蚀监测比较有限。因此,首先通过室内测量试验验证了三维激光扫描技术的测量精度可以满足磨蚀监测要求;随后,利用三维激光扫描技术开展了模型监测试验,结果表明磨蚀坑槽纵截面近似呈梯形分布,相同磨蚀时间内距离射流口越近的位置磨蚀深度越大;随着磨蚀时间的增加,不同纵截面的破坏程度差异逐渐减小。此外,扫描点云的后处理还可将全部磨蚀破坏信息进行可视化显示,从而直观全面地反映磨蚀破坏分布特征。
Concrete erosion monitoring of hydraulic structures is an important issue in hydraulic engineering. Although the development of monitoring method is rapid, there still exist many shortcomings in some aspect, such as the small monitoring scope and difficulty in obtaining the comprehensive information of erosion. 3 D laser scanning technology has been widely applied in the field of accurate engineering measurement and 3 D modelling, owing to its high accuracy and strong anti-interference ability, but this technology has been rarely applied in the concrete erosion monitoring. Thus the capability of 3 D laser scanning in concrete monitoring is verified by the indoor measurement test. In addition, the model erosion monitoring results show that the shape of longitudinal section of erosion pit approximates a trapezoid. Futhermore, the depth of erosion decreases with the increase of distance to the jet exit with the same erosion time. The difference of erosion development on these longitudinal sections become not obvious as the erosion time increase. Meanwhile, the whole erosion information can be visualized in 3 D by the point cloud post-processing, and the erosion distribution can be fully presented.
作者
王帅
徐颖
夏开文
王堃宇
张洁
WANG Shuai;XU Ying;XIA Kaiwen;WANG Kunyu;ZHANG Jie(State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Civil Engineering, Tianjin University, Tianjin 300072,China;Tianjin Tiancheng Engineering Consulting Co. , Ltd. , Tianjin 300210, China)
出处
《水利水电技术》
北大核心
2019年第2期208-213,共6页
Water Resources and Hydropower Engineering
基金
高碾压混凝土坝全寿命周期性能演变机理与安全控制(2013CB035900)
关键词
三维激光扫描
混凝土磨蚀监测
非接触式
准实时
可视化
3D laser scanning
concrete erosion monitoring
non-contact
quasi-realtime
visualization
作者简介
王 帅(1991 —),男,博士研究生,从事水利工程相关研究。E-mail: tjwangshuail991@tju.edu.cn;通信作者:徐颖(1987—),女,讲师,博士,从事岩石力学相关研究。E-mail: maggie_xu@tju.edu.cn.
