基于Civil 3D的三维地质建模方法及应用

三维地质建模是实现岩土勘察BIM动态设计的关键,如何快速、高效地建立能直接应用于指导设计施工的三维地质模型,是工程实践应用中的难点之一。以厦门第二东通道工程地质勘察项目为例,依据野外实测的地形测量数据及钻孔、物探等地质数据,利用Civil 3D强大的曲面功能,首先建立地形曲面和地层曲面单元;其次,利用Civil 3D中"由曲面提取实体"等工具,自地表而下逐层建立三维地质体,并整合生成最终的三维地质模型。此外,通过二次开发建立基于Civil 3D三维地质模型任意剖切补充模块,实现了地质模型的任意剖切及栅格图生成;同时,通过部件编辑器功能,针对沉管基槽进行开挖设计。工程应用结果表明,该建模方法便捷、直观且高效,所形成的模型能直接应用于指导工程设计和施工。

3D geological modeling method and application based on Civil 3D

3D geological modeling is the key to realizing BIM dynamic design of geotechnical survey,and how to establish a 3D geological model that can be applied directly to guide design and construction is a one of the difficult points in the engineering practice.Taking Xiamen second east-tunnel project geological investigation for example,based on the field surveying topographic data and the geological data of drilling and geophysical prospecting,etc.,and using the surface feature of Civil 3D,we create the terrain surface and formation surface at first,and then pick entities through the surfaces to create the final 3D geological model layer by layer.In addition,through the secondary development technology,we establish the arbitrary cut-off supplementary module based on Civil 3D to realize arbitrary sectioning of the geological model and generation of the grid diagram.Moreover,the trench excavation design of the immersed tube tunnel is performed through the component editor.The engineering application results show that the modeling method is convenient,intuitive and efficient,and the resulting model can be directly applied to guide engineering design and construction.