Abstract: According to the features of geologic research for landslide, the NURBS-BRep hybrid data structure was put forward to meet the needs of 3-D landslide geological modeling. Then, the corresponding constructional model of geological structural blocks was established. Based on these techniques, a set of integrated 3-D modeling method was advanced for landslide geologic bodies. It included four sections: the pretreatment for basic geological data of landslide, the 3-D modeling of landslide digital terrain and sliding surface, the system construction of geological structural surfaces, the generation and representation of geological structural bodies. This method was applied to a landslide in reservoir area successfully. Based on the established actual 3-D landslide geological model, a series of practical visual analyses proceeded. They contained arbitrary 3-D section analysis, digital drill, contour lines generation, automatic subdivision of slide blocks, visual dynamic simulation of landslide instability and accurate volume computation of landslide mass. These results can offer powerful supports to exact calculation and objective evaluation of landslide stability.

Key words: landslide mass, NURBS-BRep structure, 3-D geological model, visual analysis