Deformation Monitoring Method of Pipe Jacking in Power Tunnel Based on Laser Point Cloud
Because the Deformation monitoring process of power tunnel pipe jacking is easily affected by noise points,there are interfer-ence data in the monitoring data,resulting in inaccurate monitoring results. In order to solve this problem,a laser point cloud based deforma-tion monitoring method for pipe jacking in power tunnels is proposed. Utilize BIM' s functions of drawing vertical grids,elevations,and estab-lishing vertical family units to construct a pipe jacking construction model. The total station is used to observe the coordinates of the measuring points,and the redundant noise data is processed through point cloud resampling. Integrate a uniformly distributed rectangular load and use the two-stage analysis method to calculate the vertical additional stress of the top pipe. Under the condition of stress application,form a point cloud collection in the target area and separately classify noise point classes to achieve denoising effect. Taking the minimum distance between each point on the target area point cluster and the fitting center point as the objective function,solve the pipe jacking deformation monitoring model and obtain the monitoring results. It can be seen from the experimental verification results that the point cloud deformation monitoring method obtained by this method can eliminate the noise points and produce smooth modeling results. The maximum and minimum values were reached on August 12 and July 13,respectively,and the Euclidean distance values were 13. 5m and 9. 5m respectively. The monitoring values are within the ideal deformation range and have precise monitoring effects.
laser point cloudpower tunneldeformation of the top pipemonitornoise point
NETL
NSTL
万方数据
