RESEARCH ON 3D GEOLOGICAL MODELLING SIMULATION OF RAILWAY TUNNELAREA BASED ON CATIA SOFTWARE

摘要

In the current railway construction, the geological conditions of railway tunnels are complicated and variable, and there are many unfavorable geological phenomena, which seriously restrict the development of 3D geological modelling technology in railway industry. To overcome the restriction, this paper selects CATIA, a high-level 3D modelling software in the aerospace field, to build the 3D geological model for railway tunnel area. Firstly, the method framework of modelling is presented, which includes five steps: (1) collecting and preprocessing the original modelling data; (2) establishing the topographic surface; (3) building the interfaces of strata; (4) creating the geological bodies; (5) incising and verifying the geological bodies. The whole modelling program is processing on the basis of geological database and CATIA platform. Subsequently, taking the Shigu mountain tunnel of Baoji-Lanzhou High-speed Railway as an example to carry out the actual engineering application, in which established the 3D geological models of the entrance section, exit section, No. 1 inclined shaft and No. 2 inclined shaft of Shigu mountain tunnel as well as the whole tunnel, and which satisfied the precision of construction drawing. Finally, the feasibility and reliability of the above 3D geological modelling method are verified by incising the established geological bodies and comparing them with the original 2D geological data. In conclusion, the 3D geological modelling method is worthy of popularization and application in practical engineering.