Research On Spatial Line Selection Method Based On Geological Solid Modeling

The railway line selection is the process that the line engineer selects the line position in the 3D space according to the relevant specification.The constraint condition of the line in the specification mainly includes the plane constraint,the longitudinal section constraint and other constraints.Due to the bad geology development and frequent geological disasters,bad geology become the main constraint condition to line selection in the complex geological area.However,at present in the 3D visualization line selection is generally lack of the integrated application and effective expression of geological information,which can not meet the requirement for the railway line selection in the mountain area.Therefore,how to intuitively express and analyze bad geological information in the digital line selection system has become a hotspot and difficult research field in the field.This paper take "Research on Spatial line selection method Based on Geological Solid Modeling" as the title,combined with engineering practice to carry out relevant research.The main research contents and results are as follows:(1)Realize rapid modeling and of 3D terrain scene.Aiming at the problem of cracks in the process of railway terrain blockage,an interpolation method is proposed to solve the crack.Aiming at the problem of the large data and a wide variety of railway 3D scene models,a scheme of efficient organization and management of the scene is put forward.(2)The 3D visualization scheme of the line entity model and the 3D landscape is studied;The terrain of the cutting and tunnel portal position is excavated and removed in real time,so as to realize the perfect fusion of the line entity mode and terrain environment;The calculation of earthwork volume based on 3D visualization platform is studied.The drilling and section modeling is realized based on the borehole data.(3)The method of modeling the geologic body surface is realized by constructing the irregular triangulation(TIN)in the surface of the bad geological area;Construction of underground 3D geological model by GTP;To achieve large scale geological object extraction modeling and visual expression;based on GIS platform to establish geological information management system.(4)The method of interact line selection by 3D geological environment,line profile and the space conflict detection of line entity and geological body is proposed;The application of line selection based on geological entity object and the comparison of route structure scheme in local area is realized;On the basis of considering the bad geological and geological model,establish line Optimization Model Based on Genetic Algorithm and to verify the case.(5)Based on the theory and method of research,based on GIS and Open Scene Grap platform,the establishment of spatial line selection system based on geological entity modeling,and through examples to verify.The results show that the theory and method proposed in this paper are feasible.