关键词: 复杂地质曲面建模, 克里金插值, 三维地质建模, 变异函数, CATIA二次开发

Abstract: Constructing the interface of bedrock and cover layer is important and diffcult in the 3D geological modelling of hydropower engineering. We construct the interface of bedrock and cover layer by Kriging interpolation method, in which the layer depth is considered as interpolation variable. Then we design an effective point division method using cross-section to improve the accuracy of interpolation. For reflecting the anisotropy of attribute parameters and their spatial variation, four variation functions in the plane are calculated, and the fitting effects of different models by different variation functions are compared. Taking the Yangjiao landslide in Chongqing as an example, we establish the interface model of bedding rock and cover layer through secondary development based on 3D design platform of CATIA. We calculate volumes of the landslides constructed by Kriging interpolation and other methods, and compare the results. The results show that Kriging interpolation method is idea for geological interface modelling.

Key words: complex geological surface modeling, Kriging interpolation, 3D geological modelling, variation function, secondary development based on CATIA