铁路超重货物作用下的轨道路基响应

doi:10.13229/j.cnki.jdxbgxb201705016

摘要/Abstract

摘要： 针对超重货物作用下轨道路基力学响应行为及基床结构设计问题,基于土体弹塑性理论建立了轨道-路基一体化模型,分析了轨道、路基在超重货物作用下的响应规律,揭示了其力学性能时空演化机制,提出了超重货物作用下基床整体厚度建议值。结果表明:超重货物作用下,钢轨所受动弯应力未超出允许值;枕上最大压力为222.2 kN,接近Ⅲ型枕轨下截面设计承载能力230 kN;道床承载力不满足超重货物运输要求,因此在列车通过前后应对道床进行充分捣固密实;基床顶面最大动应力为197.37 kPa,超出了A组填料临界动应力169 kPa;建议超重货物作用下基床整体厚度取为4.3 m。研究成果可为超重货物的安全运输和轨道、路基的养护维修提供理论依据及技术参考。

关键词: 铁路运输, 超重货物, 一体化模型, 应力分布, 基床设计

Abstract: To solve the problem of mechanical response behavior of track and subgrade, and the structure design of subgrade bed under overweight goods, an integrated model of track and subgrade was established. Based on soil elastic-plastic theory, the response laws of the track and subgrade under overweight good were analyzed. The mechanism of the spatio-temporal evolution of the mechanical properties were revealed, and the overall thickness of the track and subgrade was recommended under overweight goods. Results show that, the dynamic bending stress value imposed on the rail does not exceed the allowable value. The maximum pressure of the sleeper is 222.2 kN, which is close to the designed bearing capacity, 230 kN, of the cross-section of type Ⅲ sleeper. The bearing capacity of the ballast track structure does not satisfy the transportation requirement of overweight goods. Therefore, the subgrade bed must be adequately tamped and compacted before and after the trains pass the railway. The maximum dynamic stress at the top of the subgrage bed is 197.37 kPa, which is more than the critical dynamic stress, 169 kPa, of group A filler. The overall thickness of the track and subgrade should be 4.3 for overweight goods. The results of this work can provide theoretical basis and technical reference for the safe transportation of overweight goods and the maintenance of the track and subgrade.

Key words: railway transportation, overweight goods, integration model, stress distribution, subgrade bed design

中图分类号:

U213.1

尹紫红, 朱波, 邵国霞, 孔德惠, 蒋良潍. 铁路超重货物作用下的轨道路基响应[J]. 吉林大学学报(工学版), 2017, 47(5): 1446-1452.

YIN Zi-hong, ZHU Bo, SHAO Guo-xia, KONG De-hui, JIANG Liang-wei. Response of railway track and subgrade under the effect overweight goods[J]. 吉林大学学报(工学版), 2017, 47(5): 1446-1452.

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