竖曲线与平面缓和曲线重叠设置研究  

Study on the Overlapping Arrangement of Vertical Curves and Plane Transition Curves

作　　者：柳世辉[1] LIU Shihui(China Railway First Survey and Design Institute Group Co.,Ltd.,Xi’an 710043,China)

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710043

出　　处：《高速铁路技术》2024年第1期13-16,共4页High Speed Railway Technology

摘　　要：城际铁路引入中心城区和地下车站时,在困难条件下无砟轨道地段允许竖曲线(变坡点)与缓和曲线重叠设置。本文对比分析了竖曲线与缓和曲线的不同位置关系对行车平稳性的影响,并总结了相应的适应性措施,对于优化竖曲线与缓和曲线重叠设置提供了一种技术解决方案。研究结果表明:(1)竖曲线与缓和曲线总体上不应重叠设置。当确需重叠设置时,应对平竖曲线匹配条件予以严格限制;(2)变坡点处设凸形或凹型竖曲线,在不同位置与平面曲线搭配形成的空间线形几何形态各不相同,对车轮与钢轨的密贴性能、列车横竖向激扰震动的影响存在差异,进而影响行车平稳性;(3)竖曲线、缓和曲线间位置关系的合理搭配,有利于改善线路条件。When an intercity railway extends into the central urban area and subterranean stations under challenging conditions,overlapping vertical curves(the gradient change point)and transition curves are permitted in ballastless track sections.This study examined and assessed the impact of the positional relation between vertical and transition curves on the riding comfort of train operation,concluded the appropriate adaptive strategies,and proposed a technical approach to refine the integrated configuration of vertical and transition curves for improved train operations.The findings suggest the following:(1)Vertical curves and transition curves should typically avoid overlapping.Where overlap is unavoidable,stringent criteria must be enforced concerning the compatibility between vertical and horizontal curves.(2)The type of vertical curve,whether a crest or sag,installed at the gradient change point has a significant impact when combined with horizontal curves,leading to different spatial geometrical arrangements.These configurations variably influence the wheel-to-rail contact efficiency and consequent lateral and vertical disturbances of the train,ultimately affecting the riding comfort.(3)Maintaining a suitable spatial relationship between vertical and transition curves is advantageous in enhancing overall track conditions.

关 键 词：竖曲线 缓和曲线 重叠设置 行车平稳性 

分 类 号：U212.31[交通运输工程—道路与铁道工程]