Abstract: Establishment of arch cross tunnel FLAC^3D model grid needs to use inherent cylindrical cross tunnel grid（cylint）unit in FLAC^3D, the process of building three-dimensional mesh model is inefficiency. Aimed at the numerical simulation calculation problem in field of mining engineering, technology of AutoCAD planar graph transform to FLAC^3D arch cross tunnel model was studied. Arch cross tunnel FLAC^3D model was set up by using AutoCAD, and detailed methods and steps were given. When setting up a geological model for studying arch cross tunnel engineering problems by using FLAC^3D, it can hand quickly.

Key words: AutoCAD, Arch cross tunnel, FLAC3D, Rapid modeling