无砟轨道玄武岩纤维泡沫混凝土路基动力特性分析

黄志超; 张宗宇; 苏谦; 王迅; 黄俊杰; 赵文辉

doi:10.3969/j.issn.0258-2724.20240142

无砟轨道玄武岩纤维泡沫混凝土路基动力特性分析

doi: 10.3969/j.issn.0258-2724.20240142

黄志超^1,,
张宗宇¹,
苏谦^{1, 2, ,},
王迅¹,
黄俊杰¹,
赵文辉³

1.
西南交通大学土木工程学院，四川成都 611756
2.
四川建筑职业技术学院，四川德阳 618000
3.
兰州交通大学土木工程学院，甘肃兰州 730070

基金项目: 国家自然科学基金项目（52078434，52368065，U2268213）

详细信息

作者简介:
黄志超（1990—），男，博士研究生，研究方向为道路与铁道工程，E-mail：hzc2018@my.swjtu.edu.cn

通讯作者:
苏谦（1972—），男，教授，博士，研究方向为道路与铁道工程，E-mail： tmsq@home.swjtu.edu.cn

中图分类号: U416.1
计量
- 文章访问数: 68
- HTML全文浏览量: 35
- PDF下载量: 8
- 被引次数: 0
出版历程
- 收稿日期: 2024-03-29
- 修回日期: 2024-06-18
- 网络出版日期: 2025-07-17

Dynamic Characteristic Analysis of Basalt Fiber Foam Concrete Subgrade for Ballastless Track

1.
School of Civil Engineering, Southwest Jiaotong University, Chengdu 611756, China
2.
Sichuan College of Architectural Technology, Deyang 618000, China
3.
School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China

摘要

摘要:
玄武岩纤维泡沫混凝土可作为无砟轨道路基新型填料，为分析其动力性能，通过室内动三轴试验，获取玄武岩纤维泡沫混凝土的动力学基本参数；进一步，构建玄武岩纤维泡沫混凝土无砟轨道路基的足尺室内模型，揭示其在周期荷载作用下的动力学响应；此外，建立玄武岩纤维泡沫混凝土的车-轨-路三维有限元计算模型，分析路基结构在高速行车条件下的变形特性. 研究结果表明：掺入玄武岩纤维后，泡沫混凝土的动力学性能得到增强，玄武岩纤维掺量为0.6%时，达到最优配比，相较于未掺加玄武岩纤维的泡沫混凝土动强度提高90.8%，阻尼比提高46.2%，动模量提高98.1%；玄武岩增强泡沫混凝土无砟轨道路基的整体性较好，荷载能够较为均匀的向下扩散，路基表层动应力最大值为19.37 kPa；通过数值模拟分析，路基振动在高频荷载作用下能够更快恢复平稳状态，在高速行车条件下玄武岩纤维泡沫混凝土路基表面的最大沉降为0.30 mm，相比于传统路基结构，玄武岩纤维泡沫混凝土路基在列车荷载作用下，振动响应频率高，产生的噪声更易控制.
- 高速铁路 /
- 铁路路基 /
- 泡沫混凝土 /
- 玄武岩纤维 /
- 动力性能
Abstract:
Basalt fiber foam concrete can be used as a novel subgrade filler for ballastless tracks. In order to analyze its dynamic performance, fundamental dynamic parameters of basalt fiber foam concrete were obtained through laboratory dynamic triaxial tests. Furthermore, a full-scale laboratory model of a ballastless track subgrade constructed with basalt fiber foam concrete was developed to reveal its dynamic response under cyclic loading. Additionally, a three-dimensional vehicle–track–subgrade finite element model was established to analyze the deformation characteristics of the subgrade structure under high-speed train operation. The results indicate that the dynamic performance of foam concrete is enhanced after the incorporation of basalt fibers. When the basalt fiber content reaches 0.6%, the optimal mix proportion is achieved, with dynamic strength increased by 90.8%, damping ratio by 46.2%, and dynamic modulus by 98.1% compared to foam concrete without basalt fibers. The ballastless track subgrade reinforced by basalt fiber foam concrete exhibits good overall integrity, and the applied load is distributed more uniformly downward, with a maximum dynamic stress of 19.37 kPa at the subgrade surface. Numerical simulation analysis indicates under high-frequency loading, subgrade vibration can stabilize more rapidly. Under high-speed train operation, the maximum surface settlement of the basalt fiber foam concrete subgrade is 0.30 mm. Compared with conventional subgrade structures, the basalt fiber foam concrete subgrade shows a high vibration response frequency and makes noise more controllable under train loads.
- high-speed railway /
- railway subgrade /
- foam concrete /
- basalt fiber /
- dynamic performance

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图 1 玄武岩短切纤维丝

Figure 1. Basalt short-cut fiber filaments

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图 2 玄武岩增强泡沫混凝土动力性能

Figure 2. Dynamic performance of basalt fiber-reinforced foam concrete

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图 3 玄武岩纤维泡沫混凝土路基全尺寸结构

Figure 3. Full-scale structure of basalt fiber foam concrete subgrade

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图 4 纤维增强混凝土路基动力响应竖向分布

Figure 4. Vertical distribution of dynamic response in fiber-reinforced concrete subgrade

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图 5 动应力衰减系数分布

Figure 5. Distribution of dynamic stress attenuation coefficient

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图 6 纤维增强混凝土路基动力响应水平向分布

Figure 6. Horizontal distribution of dynamic response in fiber-reinforced concrete subgrade

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图 7 纤维增强混凝土路基加速度

Figure 7. Accelerations of fiber-reinforced concrete subgrade

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图 8 纤维增强混凝土路基动力响应水平向分布

Figure 8. Horizontal distribution of dynamic response in fiber-reinforced concrete subgrade

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图 9 车-轨-路三维有限元计算模型

Figure 9. Three-dimensional finite element model of vehicle–track–subgrade system

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图 10 验证模型路基动应力

Figure 10. Dynamic stress of subgrade in validated model

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图 11 不同车速下的路基动加速度

Figure 11. Dynamic accelerations of subgrade under different train speeds

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图 12 路基加速度频谱分析

Figure 12. Frequency spectrum analysis of subgrade acceleration

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图 13 不同车速下的路基表面动位移

Figure 13. Dynamic displacements of subgrade surface under different train speeds

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表 1 纤维增强泡沫混凝土材料设计

Table 1. Fiber-reinforced foam concrete material design

密度/（kg·m⁻³）纤维含量/%

700 0，0.2，0.4，0.6，0.8，1.0

1000 0，0.2，0.4，0.6，0.8，1.0

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表 2 加载工况

Table 2. Loading conditions

加载频率/Hz 列车速度/（km·h⁻¹）

6 162

7 189

9 243

11 297

13 351

下载: 导出CSV

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