基于改进TOPSIS决策方法的铁路线路方案优选研究

Study on Railway Route Scheme Optimization Selection Based on Improved TOPSIS Decision⁃making Method

依托西宁至青海湖至茶卡铁路的西宁西至湟源段线路布线方案比选实例,以改进TOPSIS决策方法为理论支撑,选取线路长度、桥梁总长、隧道总长、平面交点数、拆迁面积、投资总额共6个主要工程数量因子作为评价指标,利用熵权法计算评价因子的权重,引入向量夹角余弦概念,得到各方案至正、负理想解的距离,并计算相应的贴进度,进而将铁路选线方案排序择优,实现对铁路线路方案科学合理的比选。结果表明:在铁路项目的前期研究阶段,采用主要工程数量因子作为评价指标可避免数据难以获取、数据复杂等弊端;改进的TOPSIS决策方法具有逻辑严谨、形象直观等特点,可得出适用于铁路线路方案比选的理论方法。

Based on comparison and selection of wiring schemes of Xining West-Huangyuan section in Xining-Qinghai Lake-Chaka railway,six main engineering quantity factors including line length,bridge length,tunnel length,plane intersection number,demolition area and total investment were selected as evaluation indexes to improve the TOPSIS decision-making method as the theoretical support for the comparison and selection of railway route schemes.The entropy weight method was used to calculate the weight of evaluation factors,and the concept of cosine of vector angle was introduced to get the distance from each scheme to the positive and negative ideal solution,and calculate the corresponding closeness.Then the railway route selection schemes were sorted and selected to achieve the scientific and reasonable comparison and selection of railway route schemes.The results show that in the early research stage of railway project,using the main engineering quantity factor as the evaluation index can avoid the disadvantages of difficult data obtaining and complex data,the improved TOPSIS decision-making method has the characteristics of rigorous logic and visual display,and the theoretical method suitable for the comparison and selection of railway route schemes can be obtained.