列车移动荷载下高速铁路板式轨道路基动力性态的全比尺物理模型试验

蒋红光; 边学成; 徐翔; 陈云敏; 蒋建群

doi:10.11779/CJGE201402013

列车移动荷载下高速铁路板式轨道路基动力性态的全比尺物理模型试验 English Version

1. 浙江大学软弱土与环境土工教育部重点实验室，浙江杭州 310058；2. 浙江大学水工结构和水环境研究所，浙江杭州 310058

基金项目: 国家自然科学基金项目（51178418,51222803）; 2012年国家留学基金项目（留金发[2012]3013）; 浙江省重点科技创新团队（2009R50050）

详细信息

作者简介:
蒋红光(1985- )，男，山东临沂人，博士研究生，主要从事土动力学、路基工程及交通岩土工程等方面的研究。E-mail: hongguang601@163.com。

通讯作者:
边学成

中图分类号: TU470
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出版历程
- 收稿日期: 2013-07-13
- 发布日期: 2014-02-20

Full-scale model tests on dynamic performances of ballastless high-speed railways under moving train loads

1. Key Laboratory of Soft Soils and Geoenvironmental Engineering of Ministry of Education, Zhejiang University, Hangzhou 310058, China;
2. Institute of Hydraulic Structure and Water Environment, Zhejiang University, Hangzhou 310058, China

摘要

摘要: 列车移动荷载下高速铁路板式轨道路基的振动特性和动力荷载传递规律对高速铁路的设计和运行维护十分重要。介绍了一种全比尺的高速铁路板式轨道路基模型和可模拟真实列车荷载高速移动的分布式加载系统,最高模拟列车速度可达360 km/h。基于该模型试验平台,对中国高速列车以不同速度运行下板式轨道路基的振动和动应力特性进行了试验研究。结果表明轨道结构的振动随着车速的提高近似呈线性增加的趋势；路基结构的振动存在阶段性,列车速度低于180 km/h时振动速度增长缓慢,而后随着速度的增加迅速增大；基床表层的碎石层对振动在路基中的传播有很好的吸收作用。试验发现,尽管无砟轨道路基表面的动应力水平远低于有砟轨道,但无砟轨道路基动应力沿深度的衰减速度要缓于有砟轨道。试验进一步发现,无砟轨道路基动应力的增长模式与列车速度和土体所处深度均有关,基于试验结果提出了用于预测高速铁路路基动应力的经验表达式。
- 高速铁路 /
- 全比尺模型试验 /
- 分布式加载系统 /
- 振动速度 /
- 路基动应力
Abstract: The dynamic performances of ballastless high-speed railways under moving train loads, such as vibration behaviors and dynamic soil stresses, are two important issues in the design and maintenance of high-speed railways. Based on an established full-scale physical model for slab tracks, a distributed loading system consisting of eight high-performance hydraulic actuators is developed to simulate the moving train loads with the highest speed of 360 km/h. The tests results such as vibration velocity and dynamic soil stress are offered for a better understanding of dynamic behaviors of slab tracks at various train speeds. The vibration velocity of track structure exhibits an approximately linear tendency with the train speed, while it begins to grow faster until the train speed reaches 180 km/h. The roadbed acts as a nice damping layer for vibration reduction. Although the dynamic soil stress at roadbed surface is much lower in ballastless tracks than that in ballasted tracks, it decreases much slowly with the soil depth in ballastless tracks. Meanwhile, the dynamic amplification coefficient of soil stress is found to be related to both the train speed and the soil depth. An improved empirical formula is then proposed to determine the dynamic soil stress of ballastless high-speed railways.
- high-speed railway /
- full-scale model test /
- distributed loading system /
- vibration velocity /
- dynamic soil stress

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参考文献(24)

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