Abstract:

 To promote the integration of green and environmental protection concepts into the railway tunnel industry, and to enrich and improve the comprehensive evaluation system for green railway tunnels, the green level evaluation system for whole life cycle of railway tunnels is studied. First, the connotation and definition of green railway tunnels are clarified, and the life cycle of railway tunnels is divided into three stages: design, construction, and operation. The direct or indirect influencing factors between different stages and the ecological environment are screened, and a green evaluation index system for the whole life cycle of railway tunnels is constructed at three levels. Second, analytic hierarchy process and entropy weight method are used to comprehensively calculate the combined weights of evaluation indicators. Based on the grey clustering evaluation theory and the data structure characteristics of indicator values, a whitening power function is constructed for indicators belonging to different green gray class levels, and a comprehensive evaluation model for the green level of the whole life cycle of railway tunnels is established. Last, taking a typical railway tunnel in Guangzhou as a research case, the comprehensive green level of the case is analyzed and calculated to be "three star green", which meets the construction requirements of green railway tunnels. At the same time, the main influencing factors of non green or unsatisfactory green grades have been identified.

Key words: railway tunnel, whole life cycle, green evaluation, combined weight, grey clustering