3D Engineering Geological Modeling of the Nansha Core Area of Guangzhou Based on Multi-source Data Coupling
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摘要: 安全合理开发利用城市地下空间需要城市地质调查工作提供支撑，三维工程地质建模是将城市地下空间的地质调查成果可视化呈现以便于实施地下空间规划、建设决策的重要手段。作为数据源的各类地质钻孔及其他相关数据具有来源不同、格式各异的特点，给数据建模和可视化呈现造成一定困难，而基于多源数据融合的三维工程地质建模能够解决建模效率低、可视化效果差的模型建设现状。作为粤港澳全面合作示范区和区域性综合服务中心，广州南沙核心区集聚高水平对外开放和经济深度融合的高端产业，其规模化建设急需开展三维工程地质建模，以实现空间利用高效化。本文通过原始数据处理、三维空间集成和多源数据融合三个步骤实现了对多源钻孔数据和其它信息的有效集成，依托南沙三维地质结构模型及信息平台搭建地质空间数据库，通过离散光滑插值（DSI）技术构建了三维曲面，并采用半自动建模方式，依据强制约束条件建立以钻孔为主、其它信息为辅的三维工程地质模型。模型应用于南沙核心区地下空间开发利用和地铁路线规划，提出了软土地面沉降的工程处理建议，助力建设“透明南沙”，为更加安全合理开发利用城市地下空间提供了科学依据。Abstract: Further exploitation and utilization of urban underground space requires continuous in-depth geological investigation, and three-dimensional (3D) modeling in engineering geology is an important approach to visualize the underground space. Due to the variable sources and formats of geological boreholes and associated data, it is difficult to model and visualize the data. The 3D modeling in engineering geology on the basis of fusion of multi-source data, however, can solve the problems of low modeling efficiency and poor visualization effect. As an integrated service center and demonstration area for the Guangdong-Hong Kong-Macao Greater Bay Area, the Nansha core area, gathered with high-end industries with high-level opening up and deep economic integration, has an urgent need for high-efficiency utilization of space through 3D engineering geological modeling and its scaling up. In this paper, the collected multi-source data was integrated through processing of raw data, 3D spatial integration, and fusion, and then a geo-spatial database was established. The 3D curved surface was constructed by using the discrete smooth interpolation (DSI) method, whereas the 3D engineering geological model was established following the semi-automatic modeling method. This model has been applied to the exploitation and utilization of the underground space such as the subway route planning in the Nansha core area, and suggestions for engineering treatment of land subsidence of soft soil were put forward. Overall, the model aids to build "Transparent Nansha" and provides the scientific basis for safer and more reasonable development and utilization of the Nansha urban underground space.
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Key words:
- Multi-source data fusion /
- Engineering geology /
- 3D modeling /
- the Nansha core area
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