Abstract
This paper presents a mesh generation technique for underground tunnels based on the 3-D Delaunay triangulation. It is a rather difficult task to make the mesh generation of tunnels because it is not easy to obtain the shape of the edge at a point where some tunnels cross each other. Thus the method which can obtain the models without calculating the edge is required. In this paper, such a method is presented. This is suggested by shield tunneling method which is used in civil engineering field. In this method, the Boolean operation is performed by using the tunneling shield module This method depends on 3-D Delaunay triangulation. The 3-D Delaunay triangulation is useful to divide a domain because it can make the tetrahedra only using the nodes which are distributed arbitrarily. This modeling process consists of two parts. The first is nodal distribution part. The second is Delaunay triangulation part. This paper gives some applications of this method to the complicated tunnel models.
