新建高速铁路与既有线并行区段精细化选线

Fine Alignment for Parallel Sections of New High Speed Railways and Existing Lines

在用地紧张、拆迁成本高昂的城区,当新建铁路与既有铁路共用车站和走廊带时,会极大地增加线路设计的难度。针对这一问题,本文提出了一种在人工线路方案的基础上进行铁路线路精细优化设计的方法。通过改进现有动态规划算法,对线路平、纵断面的线形参数进行精细化调整,以线路工程总造价为目标函数,在特定的约束、搜索范围和精度等条件下获取全局最优解,并将提出的线形优化模型框架应用在山东省某高速铁路项目路段。结果表明,该优化方法能够有效地优化铁路设计线形参数,使得房屋拆迁面积和新建线路与既有线间用地面积分别降低了4.61%、3.39%,节省了2.75%的工程总造价。

In urban areas with limited land and high demolition costs,when new railways share stations and corridors with existing railways,the difficulty of line design is greatly increased.In response to this issue,this article proposed a method for fine optimization design of railway lines based on manual line schemes.By improving the existing dynamic programming algorithm,the alignment parameters of the horizontal and vertical sections of the line were finely adjusted,with the total cost of the line engineering as the objective function,and the global optimal solution was obtained under specific constraints,search range,and accuracy conditions.Finally,the proposed alignment optimization model framework was applied to a section of a high speed railway project in Shandong Province.The results show that this optimization method can effectively optimize the alignment parameters of railway design,reducing the area of house demolition and the land area between new and existing lines by 4.61%and 3.39%,respectively,and saving 2.75%of the total project cost.