Abstract:For some complex geologic bodies,numerical models with FLAC3D are difficult to construct. While finite element programs,such as ANSYS,can easily fulfill since it has perfect pre-processors such as entity modeling,Boolean operation of geometric body,and free mesh. In this paper,a procedure is proposed to build numerical model of FLAC3D by using ANSYS,and the interface program of FLAC3D-ANSYS is compiled with visual basic language since there are some differences between the element data conducted by the two programs. So the automatic model generation of complex geologic body can be conducted as follows:the construction of numerical model by ANSYS,the transferring of element data and calling FLAC3D. Then three-dimensional numerical models of a dam and a subway are developed and the case study shows that the intuition,fastness,and automation of modeling,can be realized. The procedure gives an example to build complicated engineering geological model with the advantages of different programs.