Study On The Ecological Environment Impact Assessment Of Railway Engineering Slag Dump Based On The PSR Model

The rapid development of railway construction has brought many ecological environment problems,among which the slag dump not only occupies the land,disturbs and destroys the soil and vegetation,but also may cause soil erosion,landslide,debris flow disaster,etc.The site selection of slag dump,safety protection and soil erosion have always been urgent and difficult problems to be solved.Therefore,it is a worthy topic to analyze and evaluate the impact of railway engineering slag dump on the surrounding ecological environment and put forward targeted improvement measures.Taking the impact of the whole construction process of railway engineering slag dump on the surrounding ecological environment as the research object,this paper analyzed the possible impact of railway engineering slag dump on the ecological environment through literature analysis and case study.Combined with the analysis of relevant specifications and standards,influencing factors of ecological environment of the railway engineering slag dump were identified,and the evaluation index system was constructed,which was composed of four first-class indexes including the stacking of slag dump,the external environment pressure,the destruction of ecological environment and the protection of slag dump and 24 second-class indexes.AHP and grey Euclid evaluation method were used to construct the ecological environment impact assessment model of railway engineering slag dump.Moreover,through the case study of SPC slag dump in LN high-speed railway project,it was calculated that the comprehensive evaluation grade of the slag dump was "grade II(mild level)".According to the evaluation results and practical project situation,the protective measures of SPC slag dump were put forward.Finally,based on the research on the ecological environment impact assessment of railway engineering slag dump,the enlightenment of ecological environment protection of slag dump was put forward The research results could be used as a reference for the construction and maintenance of railway engineering slag dump.