Abstract: During the digital transformation of metro lines in operation and maintenance, some old lines lack basic data such as digital 3D tunnel models, disease files, facility and equipment accounts. Aiming at this situation and the demand for digital intelligent operation and maintenance management of subway tunnels, a method of tunnel parametric modeling is proposed based on mobile laser scanning data. (1) Various facilities and equipment are identified and segmented based on tunnel mobile laser scanning data, and the component parameters needed for modeling are extracted; (2) based on Revit API and Dynamo plugin, a set of programs for tunnel modeling in bulk is written to realize the functions of parameter import automatically, model creation, attribute addition, and material assignment; (3) the tunnel OBJ model is established to realize the model mapping, and the Revit model is loaded with the Enscape to create roaming videos. This method has been verified by the trial of the completion acceptance of Foshan metro line 2, which can realize the creation of shield tunnel model efficiently and accuratly.

Key words: mobile laser scanning, digital shield tunnel, parametric modeling, Dynamo, Revit secondary development