在缓慢移动的重载下对青路面形成机制和影响因素的分析
Pu Li1, Jiahao Fu1, Linhao Sun2
1School of Water Conservancy and Transportation, Zhengzhou University, Zhengzhou 450001, China.
Materials (Basel, Switzerland)
|September 13, 2025
概括
极端的热量和沉重的负载显著加剧了青路面的化. 这项研究量化了温度,轴负荷和制动如何影响车深度,为基础设施弹性提供了关键数据.
科学领域:
- 土木工程 土木工程是指土木工程.
- 材料科学 材料科学 材料科学
- 运输工程 运输工程
背景情况:
- 极端高温事件越来越多地影响了青路面的性能,特别是在交通繁忙的城市地区.
- 在公共汽车快速运输 (BRT) 车道和十字路口等关键基础设施中,在高温和缓慢流动的交通条件下,车道的化是一个重大问题.
- 现有的知识差距阻碍了有效的路面设计,以适应涉及极端温度,重负荷和制动的条件.
研究的目的:
- 系统地研究青路面在极高的热量,重负荷和制动条件下形成的机制.
- 量化轴荷载,行驶速度和制动加速度对车道演变的协同效应.
- 建立在具有挑战性的环境中优化路面设计和材料选择的理论基础.
主要方法:
- 开发一个三维热力学有限元素模型.
- 将太阳辐射热传递和贝利 - 诺顿爬行定律集成到模型中.
- 数字模拟以量化在不同条件下的车:极端温度 (高达70°C),重轴负荷 (100-225 kN) 和制动加速度 (1-7 m/s2).
主要成果:
- 由于路面表面温度从34°C上升到70°C,深度增加了4.83倍.
- 轴负载从100 kN增加到225 kN,导致在70 °C时车增加了56.4%.
- 与紧急制动相比,车加速加剧了车,较低的加速 (延长负载) 增加了30-40%的车深度.
结论:
- 在青路面上,由于极端温度,重轴负荷和制动作用的联合影响,路面的磨损显著放大.
- 该研究提供了对车演变的定量见解,强调了在制动过程中长时间加载的不利影响.
- 这些发现为设计更有弹性的青路面和为高压城市基础设施选择合适的材料提供了有价值的理论支持.
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