Research on the optimization algorithm of route scheme in western mountainous areas based on the concept of regional coordinated development

The geographical environment in western mountainous regions is complex, and the ecological environment is fragile. Therefore, the selection of railway routes in the western mountainous regions prioritizes environmental preservation and considerations of construction and operational expenses. During the design phase, it is essential to consider the synergistic sustainable development of both the railway and the regional environment as much as possible. Investigating the mechanisms of their synergy is necessary. Furthermore, green railway construction under the background of double carbon target in the new era also needs to be studied in depth from the perspective of coordinated development of route and regional environment. Hence, the optimization algorithm of route scheme in western mountainous area was studied based on the concept of coordinated development of regional environment. By considering the engineering and economic elements of the railway engineering subsystem in the western mountainous area and the economic environment, ecological environment and social environment elements of the surrounding regional environment subsystem as the breakthrough point, a coordinated development index system of the railway engineering in the western mountainous area and the surrounding regional environment of “2 subsystems-5 elements-33 indicators” was established. The relative entropy combination weighting method was used to optimize the subjective and objective weights, and the combination weight of the index was determined. Combined with the coupling theory, the coupling coordination evaluation model between the railway project in the western mountainous area and the surrounding regional environment was constructed, and the interaction degree between the two was quantitatively analyzed by the model. Using the coupling coordination evaluation model as a foundation, the optimization algorithm of route scheme in western mountainous area was designed. Taking the route scheme optimization of Yibin-Weixin section of Chengdu-Guiyang Railway as an example, the application verification was carried out. The optimization algorithm's calculation results of the optimization algorithm are consistent with the existing research results. The coupling coordination model succinctly and intuitively illustrates the degree of coordination between each route scheme and the corresponding regional environment. The algorithm improves the scientific rigor and practical applicability of route scheme optimization in western mountainous areas. The research results can provide some reference for the optimization of route schemes in western mountainous areas in the future. © 2024, Central South University Press. All rights reserved.