Abstract:

A method to identify key factors contributing to water and soil erosion in mountainous railway projects is proposed. Initially, the disciplines prone to causing erosion are determined. Subsequently, the interactive relationship between railway projects and water and soil erosion is analyzed to identify essential elements and construct an indicator system. Furthermore, a multi-layer network model to identify key elements is developed using a complex network model combined with the entropy weighting method, IGAHP (Improved Group Analytic Hierarchy Process) method, and DWNodeRank algorithm. A specific mountainous railway project is examined as a case study. The key elements for mountainous railway project include residue disposal, embankment slope protection, and drainage ditch layout. Key elements for soil and water conservation performance include large-scale temporary soil disturbance and residue disposal.Factors influencing soil and water loss encompass hydrology, surface vegetation, and sedimentation. Emphasizing these key elements in water conservation measures and engineering design is crucial for effectively controlling soil and water erosion and enhancing the ecological environment in mountainous railway projects.

Key words: railway engineering, soil erosion, complex networks, key elements, indicator system