Abstract: This paper discusses the application of 3D laser scanning solution based on Trimble TX8 3D scanner, Trimble SX10 3D scanner and Trimble RealWorks (TRW) and Trimble Business Center (TBC) software in metro tunnel completion survey. The operation scheme based on SX10 has the advantages of high data processing efficiency and more reliable data accuracy. The operation scheme based on TX8 has the advantages of high point cloud density and less demand for the number of CPⅢ control points. Compared with the traditional operation mode based on total station, the two operation schemes proposed in this paper greatly improve the operation efficiency and data quality, and ensure the traceability of data. Combined with the acceptance survey project of a subway tunnel in Guiyang, this paper verifies the practicability of the method and effectively popularizes the application of 3D laser scanning technology in the field of precision engineering survey.

Key words: 3D laser scanning, point cloud data processing, subway tunnel, acceptance survey