The purpose is to guide the extension of 3D laser scanning technology by investigating the application and the technological maturity in subway tunnel measurement. In recent years, a large number of documents have been researching the application of 3D laser scanning technology in subway tunnel measurement. The implementation methods, accuracy, operation efficiency and practical application effect of the current research directions are comprehensively analyzed in this paper. The conclusion are as follows: ① 3D laser scanning technology is fit for tunnel axis extraction, profile and clearance measurement, route alignment and gradient adjustment, tunnel 3D model and so on, but work efficiency need to be improved;② 3D laser scanning technology has significant advantages and been populated in section deformation and convergence analysis of tunnel, which has been compiled into code for deformation measurement of building and structure;③ Some attempts have been made in the recognition of segment joint wall seepage and cracks, but the accuracy and efficiency need to be verified.
Geotechnical Investigation & Surveying
3D Laser scanning technology