Tunnel measurement using 3D laser scanner

For safe construction, monitoring tunnel geometry closely is of the utmost importance. In complex or rich heritage environments, however, conventional methods face challenges. Terrestrial laser scanning (TLS) provides a solution to these problems. By quickly gathering 3D data that is detailed and accurate, it offers easy deformation monitoring, cross-section analysis and volume calculation. TLS accuracy is affected by environmental factors and scanner attributes. It can also be integrated with GIS, BIM and digital twin systems, among others. With millimetre-level precision, TLS lowers the level of fieldwork and labour. In the field of underground construction, it provides a more efficient substitute for traditional surveying methods.