An automatic three-dimensional geological engineering modeling method based on tri-prism

The three-dimensional geological engineering model representing the coupling relationship between geological engineering objects is the major focus of researches on three-dimensional geoscience modeling. However, a large number of challenging interactive human-computer operations is still essential in the current geological engineering modeling methods. In order to achieve full automation, a new automatic geological engineering modeling method is systematically studied and proposed in this paper. The method uses TP (Tri-Prism) volume featured by vertical side edge as the modeling primitive. First, the three-dimensional geological model which characterizes the complete interior structure and topology of the geological object is constructed based on borehole data, and the engineering model is constructed by sequential section modeling approach. The geological model and the engineering model are treated as the base model and constraint model respectively for integration. Then, the coupling of geological and engineering models is achieved by the efficient “body-surface” intersection algorithm and projective reconstruction algorithm for TP-based model with its intraformational projective characteristic. Finally, the geological engineering model is automatically reconstructed through this workflow. The experiment demonstrates that the proposed method could build seamless three-dimensional volumetric geological engineering model fully automatically and all features of TP-based volumetric model are still maintained within the model, which satisfies the requirement for volumetric model analysis.