三维激光扫描在地铁隧道形变监测中的应用

提出利用三维激光扫描点云截取隧道横断面拟合椭圆进行形变监测的方法。方法分为隧道中轴线提取,连续断面截取和椭圆拟合。隧道中轴线通过点云在水平面上投影后搜索的上下边缘点分别拟合二次曲线求均值得到;沿隧道中轴线设定等距间隔点,在间隔点处以中轴线正交方向截取断面;对截取的断面拟合椭圆并与设计值比较进行形变分析。实验表明,方法可以充分利用点云的大数据量特征,获得隧道内任意处的断面,是对目前监测方式的有益补充。

Application of 3D laser scanning to the subway tunnel deformation monitoring

It puts forward using 3D laser scanning point cloud for deformation monitoring ,which method can be divided into tunnel axis extraction ,continuous profile clipping and elliptical fitting .After the tunnel axis through the point cloud in the horizontal plane projection the upper and lower edge points searched are fitted quadratic curve calculating mean .Along the tunnel axis the equidistant intervals are set ,with central axis orthogonal direction capture cross section at intervals .A deformation analysis is made to compare fitting elliptical with the design value .Experimental results show that the method can make full use of the large amount of data characteristics of point cloud ,and get in any area of the tunnel deformation ,w hich is the beneficial supplement of monitoring .