Application of 3D laser scanning to the subway tunnel deformation monitoring
Zhu Ning-nin · Engineering of Surveying and Mapping · 2015
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,which is the beneficial supplement of monitoring.