The phenomenon of subgrade interlayer under heavy-haul train load

DING Yu; JIA Yu; WANG Xuan; ZONG Zhongling; ZHANG Jiasheng

doi:10.13471/j.cnki.acta.snus.2023D021

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The phenomenon of subgrade interlayer under heavy-haul train load

Research articles | 更新时间：2024-04-10

- The phenomenon of subgrade interlayer under heavy-haul train load
- Acta Scientiarum Naturalium Universitatis Sunyatseni Vol. 63, Issue 2, Pages: 59-66(2024)
- 作者机构：
  
  1.江苏海洋大学土木与港海工程学院，江苏连云港222002
  2.江苏省海洋工程基础设施智能建造工程研究中心，江苏连云港222002
  3.中南大学土木工程学院，湖南长沙410083
  4.高速铁路建造技术国家工程研究中心，湖南长沙410083
- 作者简介：
- 基金信息：
- DOI：10.13471/j.cnki.acta.snus.2023D021
  CLC： TU41
- Published：25 March 2024，
  
  Published Online：20 December 2023，
  
  Received：20 March 2023，
  
  Accepted：29 August 2023
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丁瑜,贾羽,王晅等.重载列车荷载作用下路基夹层现象的分析[J].中山大学学报(自然科学版)(中英文),2024,63(02):59-66.

DING Yu,JIA Yu,WANG Xuan,et al.The phenomenon of subgrade interlayer under heavy-haul train load[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2024,63(02):59-66.
丁瑜,贾羽,王晅等.重载列车荷载作用下路基夹层现象的分析[J].中山大学学报(自然科学版)(中英文),2024,63(02):59-66. DOI： 10.13471/j.cnki.acta.snus.2023D021.

DING Yu,JIA Yu,WANG Xuan,et al.The phenomenon of subgrade interlayer under heavy-haul train load[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2024,63(02):59-66. DOI： 10.13471/j.cnki.acta.snus.2023D021.

摘要

重载列车荷载作用下路基夹层、道砟囊、翻浆冒泥等路基病害频发，严重影响了列车的安全运行。为分析重载列车荷载作用下路基夹层现象，采用自制试样筒对路基土（粉质黏土）和道砟进行循环加载试验，分析重载列车荷载作用下试样变形特性及路基夹层的产生与发展过程；进而提出路基夹层的两个主要表征指标，即路基夹层厚度和细颗粒迁移质量。结果表明：1）重载列车荷载作用下，试样的轴向变形呈非线性增大的趋势；路基夹层在加载初期较为明显，加载后期路基夹层的变化不明显。2）采用路基夹层厚度及细颗粒迁移质量这两个指标对路基夹层特性进行表征，路基夹层厚度、细颗粒迁移质量与路基土体初始干密度近似呈线性负相关关系，与循环荷载幅值近似呈线性正相关关系，而加载频率对路基夹层厚度和细颗粒迁移质量的影响相对较小。

Abstract

Problems of subgrade interlayer， ballast pockets， and mud pumping frequently occur under heavy-haul train loads， which seriously affect the safe operation of trains. To investigate the phenomenon of subgrade interlayer under heavy-haul train load， the cyclic loading tests of subgrade soil （silty clay） and ballast were carried out by a self-developed test apparatus， the deformation characteristics of the sample and the development of subgrade interlayer under the heavy-haul train load were analyzed. Furthermore， two characterizing indexes of subgrade interlayer， thickness of subgrade interlayer and migration quality of fine particles， were proposed. The results show that： 1） the axial deformation of the sample increases nonlinearly with the increase of loading times under heavy-haul load. The development of subgrade interlayer is obvious in the initial stage of loading， but not noticeable in the later stage of loading. 2） The thickness of the subgrade interlayer and the migration quality of fine particles can be used to characterize the features of the subgrade interlayer. The thickness of the subgrade interlayer and migration quality of fine particles are negatively correlated with the initial dry density of subgrade soil， and positively correlated with cyclic loading amplitude. The influence of loading frequency on the thickness of the subgrade interlayer and the migration quality of fine particles is relatively small.

关键词

重载列车路基夹层轴向变形路基夹层厚度细颗粒迁移质量

Keywords

heavy-haul railwaysubgrade interlayeraxial deformationthickness of subgrade interlayermigration quality of fine particles

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