复杂山区铁路选线设计思路研究

Research on the Design Thinking of Railway Route Selection in Complex Mountainous Areas

研究目的:铁路选线是铁路勘察设计中重要的基础工作。尤其对于复杂山区铁路,通过选线设计可以确定线路的合理走向,可以降低工程难度、节省工程投资,可以提高修建铁路的经济社会效益。本文通过对衢宁铁路鹫峰山越岭段选线设计研究,从项目所处区位、地形地貌特征以及运量入手,选择合适的限制坡度,确定合理的线路走向,达到降低工程难度和节省工程投资的目的。研究结论:(1)复杂山区铁路选线应避免平原地区简单拉直线取直的思路,尤其是普速铁路,应重拾传统的沿河选线思路,选线设计过程中,首先应读图了解区域水系分布,摸清河流流向,找出山间河谷位置以及河谷上、下游谷底标高;其次应从河谷上游开始,逐渐向下游处选择合适的跨越点,充分用足限坡、局部展线等思路实现工程的优化以及工程条件的改善;在此基础上再局部调整选择合适的站位,即采用工程前置、站位次之的思路;(2)本文研究对类似复杂山区铁路勘测、设计具有参考借鉴作用。

Research purposes:Railway route selection is a very important work in railway survey and design.Especially for complex mountainous railway,the reasonable route of railway can be determined by the design of route selection,which can reduce project difficulty,save project investment,and improve the economic and social benefits of railway construction.This paper studies the design of Jiufengshan mountain crossing section of Quzhou-Ningde railway,starting from the location,topography,landform character,and traffic volume of the project,selects the appropriate limit slope,and determines the most reasonable route,to reduce the difficulty and investment of the project.Research conclusions:(1)Simple straight line straightening in plain areas should be avoided in railway route selection in complex mountainous areas.Especially the normal-speed railway,traditional route selection along the river should be recovered.In the process of route selection design:Firstly,read the map to understand the distribution of regional water system,find out the flow direction of the river,and the location of mountain valley,and elevation of valley bottom at upstream and downstream.Secondly,we should start from the upstream of the river valley,gradually select the appropriate crossing point to the downstream,make full use of the ideas of limit slope and local line expansion to realize the optimization of the project and the improvement of the project conditions.On this basis,local adjustment is made to select proper station,that is to say,the idea of project ahead and station next.(2)This paper has a reference for railway survey and design in similar complex mountainous areas.