Research On Fast Dodeling Method Of Railway Geological Environment And Line Structure Based On BIM

With the rapid development of railway and the improvement of efficiency and benefits brought by the successful application of BIM technology,the traditional two-dimensional design not only restricts the creativity of designers,but also limits the productivity of railway engineering.Therefore,the design of railway lines increasingly requires BIM technology to completely innovate the two-dimensional design mode.At present,the railway line selection design is developing towards the direction of solid line selection,that is,the line design is carried out on the three-dimensional terrain entity,and the 3d models of railway subgrade,bridge,tunnel and track are rapidly arranged according to the line,while the primary task of solid line selection is the rapid creation and assembly of railway structure model.The method of rapid establishment and automatic layout of 3d geological environment and railway line structure model based on BIM secondary development technology research in this paper is of great significance.The main research contents and research results of this paper are as follows:(1)The DEM and borehole data obtained are calculated and sorted out through the virtual borehole interpolation program to obtain a large amount of data needed to create 3d geological environment.Based on Civil 3D platform,the modeling of terrain surface,geological layer entity and bad geological body was completed.Based on the three-dimensional geological model,the route design provides a more intuitive scheme design for the route designers and outputs the final design data.(2)Based on the analysis of structure and parameters of railway line structures and the analysis of modeling methods of different properties of Revit family samples,the establishment of parametric family database of bridge,tunnel,track and other line structures is realized.(3)The application of Revit secondary development technology,combined with Civil 3D output design data,to achieve the rapid creation,automatic assembly and rapid modification of railway line construction model,focusing on the research on the creation,positioning,placement and adjustment method of railway line construction model based on 3D terrain and curve.