| Compared with ordinary railway projects,mountain rail transit railway projects have unfavorable environmental conditions such as complex terrain conditions and numerous unfavorable geological factors,which makes actual surveys and route design relatively difficult.At the same time,there are many environmentally sensitive areas such as national nature reserves and scenic heritage sites in the western mountainous areas.The ecological environment of environmentally sensitive areas is very fragile and vulnerable to external influences,and is related to the sustainable development of the entire regional ecosystem.Therefore,the "ecological route selection" method of railway project route selection design from the perspective of environmental protection and sustainable development is the main research topic of future route selection design in the future.In the face of the complex ecological environment of mountainous regions,the traditional two-dimensional graphic design process is difficult to effectively deal with difficult road sections,which increases the project design risks.Taking the 3D virtual environment route selection technology based on the digital route selection platform as an example can visually present the mountain ecological environment to the designer through modeling,which greatly improves the design efficiency and design feasibility,which also provides designers with another design idea.Through the digital route selection platform,derivative functions such as the generation of threedimensional models of mountain railway projects and the comparison and selection of multiple plans for ecological environmental impact can also be realized.This article will take the Chengdu-Siguniang Mountain Railway Project as an example to study the ecological route selection method for mountain rail transit projects based on the digital route selection platform.This thesis has discussed the mutual influence of mountain railway construction on the ecological environment and the complex mountain ecological environment on the design and construction of mountain railways by comparison.It has been obtained that there is not only one-way influence,but also the coordinated development of railway engineering construction and mountainous area environment,and ecological route selection as a control The key point is to reduce the damage to the environment caused by the project from the source.Information from the composition,principles,and modeling methods of the railway digital route selection system provides theoretical basis and methodological guidance for the construction of the Chengdu-Siguniang mountain railway project on the digital route selection platform.According to the project overview,the project geographic information data has been collected,and after data processing,the digital railway line selection system has been used to establish the engineering geological virtual environment model of some sections of the ChengduSiguniang Mountain Railway.Using the cog railway line structure model and bad geological information,added the structure model and bad geological information model to the virtual environment model.Finally realized the multi-scheme route selection in the virtual threedimensional geological environment.According to the impact indicators of environmentally sensitive areas,a multi-scheme route selection evaluation index model for environmentally sensitive areas has been constructed.Through the comparison and analysis of the evaluation index model program for multi-scheme route selection in environmentally sensitive areas,the two schemes(D3K83+000～D3K84+900)of the Ciba Street section of the Chengdu-Siguniang Mountain Rail Transit Project have been compared,and the impact values has been respectively.The influence values obtained are 0.73332 and 0.63527 respectively,and after the inspection,the latter is recommended according to the degree of impact on the environment sensitive area. |
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