Abstract:Based on the work of Geotechnical Engineering Research Institute of CUMT(Beijing),the engineering rock masses are divided into two types and four sub types by their characteristics for 3D modeling,that is,stratified non-inverse continuous rock masses,discontinuous(faulted) rock masses,inverse folded rock masses and unstratified rock masses(intrusive rock masses,extrusive rock masses). According to geometric characteristics and geological data of unstratified rock masses,the suitable spatial data model of unstratified rock masses is put forward by means of GIS visual technique and corresponding modeling method. 3D modeling method of unstratified rock masses is established,in which section method is adopted. 3D reconstruction of a set of planar contours is used to create the surface model of unstratified rock masses. The problem of reconstruction of a set of planar contours is then translated into the problem of structuring equivalent surface of body data. Visual modeling system based on the modeling technique is developed,and this system is verified in the example of unstratified rock mass modeling in Lingbao gold mine.