Abstract: To solve the increasingly outstanding urban geological problems and help researchers with visual analysis to urban geological survey data, three-dimensional geological structure model of Cenozoic erathem in Beijing was constructed for the first time. Due to the difference of precision in source data, the Cenozoic model was divided into two parts to be constructed respectively. Quaternary, the first part, was constructed via a former algorithm, the three-dimensional geological multi-body modeling algorithm from netlike cross-sections with topology. The stretching strategy was utilized to improve the solution of the algorithm to multivalue problem. Paleogene and Neogene, the second part, were modeled by using vertical addition of DEM. The constructed model deepened the cognition of geological researchers to the Cenozoic geological setting in Beijing. It also provided data support to the increase of exploiting efficiency of underground water and the rationalization of engineering planning.

Key words: Beijing, Cenozoic erathem, three-dimensional geological structural model, multivalue, three-dimensional geological modeling, vertical addition of DEM

摘要： 为解决日益突出的城市地质问题，帮助研究人员对城市地质调查数据进行可视化分析决策，首次建立了北京市新生界三维地质结构模型。由于原始资料精度的差别，将新生界模型分为两大部分分别构建：第四系建模采用基于网状含拓扑剖面的三维地质多体建模方法，利用拉伸策略改进了对多值问题的处理局限；新近系和古近系建模采用DEM垂向叠加的方法。模型的建立深化了地质研究者对北京市新生界地质情况的认识，为提高北京市的地下水开发效率、合理规划北京市的工程部署提供了数据支持。

关键词: 北京, 新生界, 三维结构模型, 多值, 三维地质建模, DEM垂向叠加