约束剖分的含断层地质体三维构模方法

Modeling of three-dimensional geological faults based on constrained Delaunay triangulation

针对地下空间三维地质构模技术发展慢的问题,提出一种快速三维构模的方法.首先利用径向扫描法将无约束的点集构建成无约束初始的三角网,再将多源数据中的约束线(包括剖面线、地表地质线、基岩地质线等)依次嵌入到无约束的初始三角网中重新生成带约束的德劳内三角剖分,生成了地层面、断层面等,然后通过人工拼接这些地层面,最终形成完整的三维地质体模型.运用Visual C++6.0生成的各种不规则三角网模型,建立了武汉市汉阳区城市三维地质模型.实践结果表明,建立的三角网范围广且包含了大部分的约束点,增加了构模的精度、速度.

Considering that the development of modeling ical underground space is slow, an approach to quick 3D technology for three-dimensional （3D） geolog- modeling was proposed. First, by using radial scanning method, the unconstrained points were used to construct a triangle mesh with unconstrained initial conditions. Then, the constrained line, including cross-section line, surface geological line, bed- rock geology line, etc. , in the multisource data were erate constrained Delaunay triangle subdivision, and orderly embedded into the triangle mesh to regenaccordingly, the ground surface, the fault plane, etc. , were generated. Afterwards, these ground surfaces were artificially assembled to generate an integrated three-dimensional geological model. Finally, as a case study, a three-dimensional geological model of Hanyang District was established by generating a variety of irregular triangle mesh models. The results show that the generated triangle mesh has a broad scope which includes the majority of the constrained points, and increases the accuracy and speed of modeling.