[关键词]
[摘要]
基于移动三维激光扫描隧道点云数据,通过点云预处理、断面提取过滤,最后进行隧道管环实测轴径提取、椭圆拟合得到断面的水平轴径值、椭圆度等数值成果表及椭圆拟合等成果图。从几何形态学的角度,对横径与设计偏差、椭圆周长、椭圆均轴差等椭圆拟合结果参数与椭圆度之间数学关系及相关性进行统计分析与研究,探究隧道管环实测点云经过椭圆拟合出的长短轴长异常值的自动筛选方法。结果表明:椭圆度与横径值具有较强的线性相关性;椭圆均轴差D(椭圆长轴加短轴与两倍理论圆直径之差)与椭圆周长和理论圆周长之差d具有文中式(11)约束关系,可以用作管环变形椭圆拟合长短轴长异常值的筛选依据。
[Key word]
[Abstract]
Based on the tunnel point cloud data obtained by the mobile 3D laser scanning technology, point cloud preprocessing, section extraction and noisy point filtering were carried out, and finally the extraction of measured tunnel ring axial diameter and ellipse fitting were carried out to obtain the numerical and graphic results of horizontal axial diameter, ovality and other ellipse fitting results. From the perspective of geometric morphology, the mathematical relationship and correlation between ovality and ellipse fitting result parameters, such as horizontal transverse diameter and design deviation, ellipse circumference, ellipse axis mean-difference, were statistically analyzed and studied, and the automatic filtering method of long and short axis length outliers obtained by ellipse fitting of measured point cloud of tunnel ring was explored. The results show that there is a strong linear correlation between ovality and horizontal transverse diameter. Ellipse axis mean-difference D (the difference between the major axis plus the minor axis of the ellipse and twice the diameter of the theoretical circle) and the difference between the circumference of the ellipse and the theoretical circumference d has the constraint relation of the formula (11) in this paper, which can be used as the filtering basis for the long and short axis length outliers in the ellipse fitting of tunnel ring deformation.
[中图分类号]
[基金项目]
国家自然科学基金项目(面上项目,重点项目,重大项目)