Research On Digital Line Selection Method Based On 3D Modeling Of Geological

Railway line selection design is the line design staff in the three-dimensional space to determine the direction of the line to the process,especially in some geological conditions of the more complex areas,compared to the election line when the geological factors considered the most,pay more attention to "geological selection" Geological factors often become the determinant of the choice of line options,reasonable line not only reduce the risk of construction,more effective to reduce the cost of post-line maintenance and improve operational safety.How to effectively express and apply these geological information is the key to determine the success or failure of "geological route selection".At present,all the virtual visualization of the three-dimensional line selection system platform,in the geological line this is not mature enough.Therefore,how to express bad geological information in the selection system becomes a hot spot in the field of line selection.This paper studies the integration technology of multi-source geological information to realize the spatial information integration of remote sensing image,regional geology,geological disaster and survey data,and provide comprehensive geological data for 3D geological modeling.The theory and method of three-dimensional geological modeling of railway are studied.The acquisition of DTM and DOM in the three-dimensional geological environment of the railway is studied,and the orthophoto images of the long striped line area are obtained based on the network geographic image resources.Based on geological survey data,digital geological modeling data were extracted.Research on Geological 3D Model and Visualization Technology.(1)Based on OSG high-level rendering engine,the scene tree structure of 3D geological model is constructed.Based on the "ray intersection" scene object picking technology,virtual drilling core algorithm,profile automatic connection algorithm and geological database,the drilling and engineering geological profile visualization generation and query are realized.(2)to achieve the geological entity model of multi-angle observation and a variety of visual expression.The foundation pit excavation simulation of 3D geological model and the generation and virtual roaming of underground tunnel are realized.So as to facilitate the election line engineer for the bridge and tunnel site selection,roadbed filling and so give reasonable selection of line selection.Based on the calculation of the spatial conflict of geological entity and line entity,the selection of line selection based on geological entity object and the comparison of line structure scheme of local section are realized.