基于BIM的铁路路基三维建模方法研究

Research on Three-Dimensional Modeling Methods of Railway Subgrade Based on BIM

对基于Bentley平台的铁路路基三维建模方法展开探索和研究:(1)对路基建模方法的研究现状进行总结,认为基于网格和参数化的建模方法较为适用。(2)根据路基结构的造型特点,将路基结构物分为线状构造物和不连续构造物。(3)连续线状构造物建模主要分两步,一是通过编辑横断面构建路基骨架,二是采用放样、拉伸横断面的方式构建路基网格模型,再通过三维可视化检查模型的合理性。(4)对于不连续构造物,如挡土墙、地基处理桩等构件,应采用参数化的建模方法。

The three-dimensional modeling method of railway subgrade based on the Bentley platform is explored and studied.(1)By summarizing the research status of subgrade modeling methods,it is concluded that the modeling methods based on grid and parameterization are more suitable.(2)According to the model characteristics of subgrade structure,the structures are classified into linear structures and discontinuous structures.(3)The modeling of linear structures is divided into two steps:one is to construct subgrade skeleton by editing cross section,and the other is to construct subgrade structure grid model by lofting or stretching the cross section.The rationality of the model can be checked through three-dimensional visualization.(4)Parametric modeling method should be adopted for discontinuous structures,such as retaining wall,pile foundation and other components.