基于NURBS曲面建模的山区公路边坡变形监测研究

Research on Deformation Monitoring of Mountain Highway Slope Based on NURBS Surface Modeling

为了获取更高精度的边坡模型和变形监测结果,将NURBS曲面建模技术引入到三维激光扫描技术领域中.以太行山区X012公路双影线几处边坡为例,基于三维激光扫描和NURBS曲面重建方法对其进行变形监测.监测结果和边坡GPS变形监测结果基本一致,体现出了良好的准确性.实验结果表明,相比传统的DEM模型和三角面片模型,边坡NURBS曲面模型的地形拟合度更高,对边坡细节的表达也更完整丰富,其模型效果更加贴合边坡表面地形的真实起伏状态,且通过变形监测可准确找出研究区各边坡的地质灾害隐患点,说明该方法具有良好的精确度,可将其应用到公路边坡高精度建模中.最后提出了相应的灾害防治建议.

In order to obtain more accurate slope model and deformation monitoring results,NURBS surface modeling technology is introduced into the field of 3D laser scanning technology.Taking several slopes of highway X012 highway in Taihang Mountain Area as an example,deformation monitoring is carried out based on 3D laser scanning and NURBS surface reconstruction method.The results show that the deformation monitoring results are basically consistent with the GPS deformation monitoring results of the slope,which shows good accuracy.The experimental results show that,compared with the traditional DEM model and triangular patch model,the slope NURBS surface model has higher terrain fitting degree.The expression of slope details by NURBS surface model is more complete and rich,and its model effect is more suitable for the real fluctuation state of slope surface terrain.The potential geological hazard points of each slope in the study area can be found out accurately by deformation monitoring.It shows that the method has good accuracy and can be applied to high-precision modeling of highway slope.Finally,the corresponding disaster prevention and control suggestions are put forward.