基于VTK的隧道围岩裂隙三维重建方法研究  

3D Reconstruction Method of Tunnel Surrounding Rock Fracture Based on VTK

作　　者：柳厚祥 苏恒 LIU Houxiang;SU Heng(School of Civil Engineering,Changsha University of Science&Technology,Changsha,Hunan 410114,China)

机构地区：[1]长沙理工大学土木工程学院,湖南长沙410114

出　　处：《中外公路》2024年第6期226-232,共7页Journal of China & Foreign Highway

基　　金：国家自然科学基金资助项目(编号:52078060);湖南省自然科学基金资助项目(编号:2024JJ5036);湖南省教育厅科学研究重点项目(编号:19A025);湖南省水利厅科技项目(编号:XSKJ2019081-39)。

摘　　要：裂隙参数是围岩稳定性分析的参考因素,为了实现围岩裂隙的可视化分析,该文提出一种基于可视化工具包VTK的围岩裂隙三维重建方法。首先将采集的隧道围岩图像使用OpenCV进行图像灰度化、降噪的预处理;其次运用Otsu法和形态学中的开运算进行图像分割处理,得到较为完整的围岩裂隙图;然后将VTK中传统的Marching Cubes算法采用中值法代替线性插值法计算等值点,并运用改进后的Marching Cubes算法对处理后的裂隙图像进行三维重建;最后将改进后的算法与原算法的三维模型重建速率进行对比。研究结果表明:(1)将VTK应用于隧道围岩裂隙的三维重建,可以得到较完整的裂隙三维模型,实现局部围岩裂隙的三维重建;(2)两种算法重建的裂隙三维模型效果无明显差别,但改进算法的三维模型重建速率提高了18%。Fracture parameters are important reference factors for surrounding rock stability analysis.To realize the visualization analysis of surrounding rock fractures,this paper proposed a three-dimensional(3D)reconstruction method of surrounding rock fractures based on the visualization toolkit(VTK).Firstly,the collected tunnel surrounding rock images were preprocessed by OpenCV for image grayscale and noise reduction.Secondly,the Otsu method and the open operation in morphology were used to segment the image,and the complete surrounding rock fracture map was obtained.Then,the median method was used to replace the linear interpolation method with the traditional Marching Cubes algorithm in VTK to calculate the equivalent point,and the improved Marching Cubes algorithm was used to carry out the 3D reconstruction of the processed fracture image.Finally,the 3D model reconstruction rates of the improved algorithm were compared with that of the original algorithm.The results show that①by applying VTK to 3D reconstruction of tunnel surrounding rock fractures,a complete 3D model of fractures can be obtained to realize 3D reconstruction of local surrounding rock fractures;②there are no significant differences between the two algorithms in the 3D model of fractures,but the 3D model reconstruction rate of the improved algorithm is increased by 18%.

关 键 词：隧道围岩裂隙 图像处理 VTK 三维重建 

分 类 号：U452.1[建筑科学—桥梁与隧道工程]