基于GTP的断层三维交互建模方法

On the GTP-Based 3D Interactive Modeling Method for Geological Faults

在总结分析现有断层建模方法的基础上,提出一种基于广义三棱柱(GTP)的断层三维交互建模方法(岩柱体分区RPBP建模法).该方法以钻孔数据为建模主体数据源,主要步骤包括:根据钻孔孔口数据点与断层露头约束,按约束Delaunay法则生成地表不规则三角网(CD-TIN);判断地质体内断层的类型及断层构模的优先级顺序,建立岩柱体界限三角形;以界限三角形为依据建立断层实体模型.软件实验表明,该方法能便捷可靠地实现包括正、逆断层及其相互切割的各类复杂断层系的三维交互建模.

Based on the summarization and analysis to present methodologies of 3D modeling of the geological faults, a new method named rock pillar body partition （RPBP） modeling is put forward on GTP（generalized tri-prism） basis for 3D spatial modeling of faults. The RPBP method takes borehole data as its original data source, and the modeling process includes the steps as follows. Generate the constrained Delaunay TIN （CD-TIN） of terrain in accordance with the collar data of borehole and the outcrops of faults. Construct the limiting triangles in each rock pillar body （PRB） according to the types and modeling priority sequences of the fault system. Develop the 3D faults spatial model in accordance with the limiting triangles. The programming test showed that the RPBP method can accurately describe the complicated fault system involving obverse and reverse faults and its inter-clipping, and is smartly as well as reliably to construct interactively the 3D spatial modeling of complex fault system.