| With the development of China’s railway construction, railway construction in a variety of negative impacting on the environment have become increasingly prominent, environmental evaluation of railway construction project attracted widespread attention. From the engineering characteristics of railway construction projects starting, the concept of the railway domain ecosystem, and from systems theory, environmental carrying capacity in terms of the theory of railway construction project environmental impact assessment to build a theoretical support, provides an overview of the ecological environment of railway construction project, land resources, water environment, the general impact of atmospheric and acoustic environment, and establish a comprehensive railway construction project environmental impact evaluation of the basic content and evaluation model was constructed from the mathematical methods. Railway environmental impact assessment is to be a reasonable choice of basic evaluation, this article from the characteristics of the railway construction project starting, PSR framework model, constructed the index system of railway and railway construction projects during the operation. The importance of the index system of indicators is not the same, therefore, the selection of indicators is the Environmental Impact Assessment of the more important part, this paper presents a list of screening method, principal component analysis and AHP sort of indicators. Environmental Assessment selected quantitative indicators of environmental impact assessment has been one of the main research object, the paper respectively qualitative and quantitative indicators of view, the various evaluation conducted quantitative study. Finally, the processes and the mathematical model railroad construction project environmental impact comprehensive assessment. Finally, the thesis put the second lane from Lanzhou to Urumqi (Gansu) railway as an example, to verify the theoretical study of this article. |
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