The new city in Daxing district is the focus of future development in the southern of Beijing city, establishing 3D geological model of its engineering construction layer can provide a scientific basis for urban planning and construction as well as the land's proper utilization. After collecting the geological drilling data, we establish the geological model based on a 3D geological modeling platform developed by Peking University. The 3D spatial modeling method based on sections is used to analyze two key technical problems about simulation process named high-precision modeling and rapid modeling respectively. In the modeling process, Delaunay triangulation and Kriging interpolation algorithms are used. Furthermore, the manual intervention is achieved through the use of flexible and convenient 3D interactive modeling tools. The application examples indicate that the 3D geological model constructed by this method can better reflect the actual situation, it also possesses the advantages of high precision and fast modeling.
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