Analysis of Tunnel Ellipticity Based on Point Cloud
With the rapid development of urban rail transit in China,the monitoring workload of tunnel engineering is getting larger and larger.Thanks to its high precision,big data volume and high efficiency,the 3D laser technology has good application prospects.In this paper,the measurement data is extracted by data processing of the point cloud data,and the influence of the calculation algorithm on the results and the comparison with the results of the manual measurement fitting show that the calculation algorithm itself has negligible impact on the accuracy of the results,and the accuracy of the obtained data.The measurement and fitting results of manual total station are comparable.The number of points involved in the calculation of the tunnel cross-sectional ellipsoid parameters obtained from the point cloud data is far more than that of the manual measurement,so it has a better robustness.
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