基于特征约束的四面体剖分方法研究  

Research on tetrahedral profiling methods based on feature constraints

作　　者：胡长涛 张志华 吴智慧 HU Changtao;ZHANG Zhihua;WU Zhihui(Faculty of Geomatics,Lanzhou Jiaotong University,Lanzhou 730070,China;National-Local Joint Engineering Research Center of Technologies and Applications for National Geographic State Monitoring,Lanzhou 730070,China;Gansu Provincial Engineering Laboratory for National Geographic State Monitoring,Lanzhou 730070,China)

机构地区：[1]兰州交通大学测绘与地理信息学院,兰州730070 [2]地理国情监测技术应用国家地方联合工程研究中心,兰州730070 [3]甘肃省地理国情监测工程实验室,兰州730070

出　　处：《测绘工程》2023年第6期17-22,共6页Engineering of Surveying and Mapping

基　　金：国家自然科学基金资助项目(41861059)。

摘　　要：针对地下空间复杂曲面约束情况,文中提出一种对多地层表面模型进行约束Delaunay四面体剖分构建地质体模型的方法,即利用Delaunay三角网构建地层约束,通过限定四面体单元半径边长比和最小二面角等特征约束控制网格质量剖分生成地质体的四面体格网模型。以陕西省某地区为例,应用此方法构建顾及地下空间约束及可视化效果较好的三维地质模型。实验表明,该方法可生成满足约束条件要求且格网质量较高的地质模型,可为地下矿体开采等实际生产提供数据支持。Considering the complex surface constraints in subsurface space,this paper proposes a method to construct a geological body model by constraining Delaunay tetrahedral sectioning of multi-stratigraphic surface models,that is,Delaunay triangulation is used to construct stratum constraints.By limiting the radins side length ratio of tetrahedral element and minimum dihedral angle,we control the gricl mass subdivision to generate a tetrahedral boy netuork model.This method is applied to an area in Shanxi Province to construct a 3D geological model with good subsurface space constraints and visualization effects.The example shows that the method can generate a geological model that meets the constraints and has a high grid quality,which can provide data support for practical production projects such as underground ore body mining.

关 键 词：三维地质建模 约束Delaunay四面体剖分 特征约束 

分 类 号：P208[天文地球—地图制图学与地理信息工程]