40 t 无砟重载铁路隧底结构设计参数研究
DOI:
作者:
作者单位:

作者简介:

通讯作者:

中图分类号:

U212.33+ 4

基金项目:


Study on design parameters of tunnel bottom structure of 40 t ballastless heavy haul railway
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    针对隧底围岩损伤的数值模拟,因采用理想状态下的弹塑性模型仅对强度参数进行折减,而循环荷载作 用下围岩的累积损伤及隧底积水的反复冲刷作用均未考虑在内,使得计算结果与现场实测值相差较大的问题。本 研究基于隧底围岩的累积损伤机理与隧底混凝土结构的损伤塑性特性,利用 ABAQUS 有限元软件建立隧道-围岩 耦合二维计算模型,对重载列车荷载作用下,单线无砟隧道隧底衬砌结构的主要设计参数进行分析。研究结果表 明:随着列车轴重的增加,隧道底部围岩逐渐出现损伤,当轴重为 40 t 时,隧底结构出现明显的损伤效果;改变 矢跨比对仰拱竖向位移影响不大,当矢跨比大于 1:7,仰拱结构拉应力增大趋势变缓;改变填充厚度对仰拱竖向 位移影响不大,当填充层厚度大于 1.1 m 时,这种减小的趋势逐渐变缓。

    Abstract:

    At present, the strength reduction method for the numerical simulation of tunnel surrounding rock damage only reduces the strength parameters using the ideal elastoplastic model. The cumulative damage of surrounding rock under cyclic loading and the water erode at the bottom of the tunnel is always ignored, so the calculation results are often quite different from the actual value. Based on the cumulative damage mechanism of tunnel surrounding rock and the damage plasticity of tunnel concrete structure, the large-scale finite element software ABAQUS was used to establish a two-dimensional model of tunnel surrounding rock. The main design parameters of lining structure of tunnel bottom were studied. The results show that the surrounding rock of the tunnel is damaged gradually with the increase of the axle weight of the train. Especially, the tunnel bottom structure is easily damaged by the 40 t axle load. The vertical displacement of the inverting arch is slightly impacted by the span ratio and the thickness of the filling layer. When the sagittal ratio reaches 1:7, the tensile stress of the invert arch structure increases slowly. When the thickness of the filling layer is greater than 1.1 m, the tendency of the reduction is gradually slowed down.

    参考文献
    相似文献
    引证文献
引用本文
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:
  • 最后修改日期:
  • 录用日期:
  • 在线发布日期: 2022-06-09
  • 出版日期: