重载铁路路基基床结构设计研究  

Design Research on the Subgrade Structure of Heavy Haul Railway

作　　者：郭抗美[1] 王岩[1] 叶庆志 刘晶磊[3] 

机构地区：[1]河北工业大学,天津300401 [2]西南交通大学高速铁路线路工程教育部重点实验室,成都610031 [3]铁道第三勘察设计院集团有限公司,天津300251

出　　处：《铁道工程学报》2014年第11期1-5,19,共6页Journal of Railway Engineering Society

摘　　要：研究目的：目前我国重载铁路路基厚度的设计依据现行高速铁路路基设计规范,但重载列车与高速列车作用下路基的工作机理存在较大差异。为此,本文根据弹性理论建立轨道-路基三维有限元模型,分析不同荷载水平和基床结构形式下路基动应力分布和衰减规律,提出用动强度控制设计方法确定不同轴重下重载铁路路基基床厚度。研究结论：（1）重载铁路荷载条件下,由于需要考虑轮轴的叠加效应,路基动应力衰减速率明显减小;（2）依据现行重载铁路设计方法得到的路基设计厚度处的动应力与自重应力之比为0.3－0.5,不满足设计要求;（3）采用动强度设计原则,25 t轴重下的基床整体厚度为2.1－2.3 m,30 t轴重下的基床整体厚度为2.8－2.9 m,35 t轴重下的基床整体厚度为3.2－3.3 m;（4）该结论可为重载铁路路基基床结构设计提供参考。Research purposes： Nowadays the design of subgrade thickness of heavy haul railway in China bases on current specification for subgrade design of high speed railway, but work mechanism of the subgrade under the load of heavy haul train and high speed train differs widely from each other. For this purpose, according to elastic theory, track - subgrade three - dimensional finite element model is established in this paper, thus to analyze the dynamic stress distribution and attenuation law of the subgrade at different load levels and in different structural styles. In addition, the design method of dynamic strength control is suggested to confirm the thickness of the subgrade bed of the heavy haul railway under different loads. Research conclusions： （ 1 ） The decay rate of dynamic stress reduces significantly under the load of heavy haul railways on account of the fact that the superimposed effect of shaft should be taken into account. （2） According to the current design method of heavy haul railway, the ratio between dynamic stress and self- weight stress on the design thickness of the subgrade under superimposed load is calculated out to be 0.3 － 0.5, which does not meet the design requirements. （ 3 ） By adopting the dynamic strength design principle, the entire thickness of the subgrade bed should be 2.1 - 2.3 m under the axle load of 25 tons, 2.8 - 2.9 m under the axle load of 30 tons, 3.2 － 3.3 m under the axle load of 35 tons.（4） The conclusions above provide valuable reference for heavy haul railway subgrade bed structure design.

关 键 词：重载铁路路基 基床厚度设计 数值分析 

分 类 号：TU47[建筑科学—结构工程]