Abstract: Tunnels are the core of mine projects, and 3D tunnel modeling is an important component of digital mine construction.In light of the 2D tunnel feature of symmetry along tunnel center line and the 3D tunnel feature of symmetry on sections, a new 3D tunnel modeling method-tunnel symmetrical modeling is proposed, which is capable of a correct modeling for cases such as tunnel intersection and has solved the problem in conventional 3D tunnel modeling.Based on this symmetrical modeling, a 3D tunnel data architecture is designed and used, in combination with VC++ and OpenGL, to realize the building and visualization of 3D tunnel modeling for trifurcate shaped and cross shaped tunnels.

Key words: 3D tunnel, Digital mine, Topological relation, Symmetrical modeling, OpenGL