3D geological modelling method based on hybrid data model
Résumé
Based on comprehensive analysis on research findings of 3D geological model made by predecessors, a new method using hybrid data model is proposed to construct 3D geological model. This method takes borehole as its main modeling data source, and the modeling process includes: 1) generate triangle irregular network (TIN) adhering to the Delaunay’s law of ground surface according to borehole’s collar data, 2) down the borehole extend each triangle of TIN into generalized tri-prism (GTP) with knowledge inference rule, 3) convert GTP model into tetrahedral network (TEN) model or boundary representation (B-reps) model according to certain conversion algorithm. This mixed modeling method integrates the advantages of TIN, GTP, TEN and B-reps model. It is not convenient to update data dynamically, but easy to construct 3D geological model, carry out visualization and spatial analysis, extending applicable scope of 3D geological model. Based on the constructed 3D geological model in Central Business District (CBD),Beijing, some engineering applications including arbitrary cutting, virtual excavation design, virtual wandering and others are demonstrated, the flexibility and practicality of this modeling method is tested.
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