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IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-02-25 DOI:10.1016/j.conbuildmat.2025.140511

Seong-Hyeok Lee , Sung-Il Kim , Sarkar MD Nasim , Dae-Wook Park

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引用次数: 0

摘要

众所周知，沥青混凝土（AC）轨道可提高承载能力，增强轨道结构的稳定性和耐久性，减少振动和噪音，从而降低维护成本和工作量。此外，沥青铺设完成后，列车运行可迅速启动，轨道因脱轨等原因发生重大变形时也可迅速恢复，而且它还是一种可回收材料。但影响沥青混合料力学性能最重要的环境因素之一是温度，即沥青混凝土轨道的温度分布和环境条件对其性能有影响。因此，为了验证温度对沥青混凝土轨道的影响，我们测量了列车运行一年期间作用在底碴层上表面的压力和沥青层下表面的应变。本研究针对沥青混凝土轨道结构，特别是沥青混凝土层和底碴层，进行了荷载分布特性、温度塑性变形和抗裂性研究，并根据国内外设计标准进行了理论和分析。交流轨道受温度影响与以往文献相同，与定点荷载试验的数值相比显示出较大的数值，但轨道正下方的底碴层压力为 46.68 kPa 至 54.81 kPa，在底碴允许压力（133 kPa）范围内，沥青层应变率也显示出 17.19-21.58με 的较低值。通过这项研究，证实了沥青混凝土轨道符合设计标准，并具有优异的荷载分布特性、塑性和抗裂性。此外，还对列车速度的影响进行了数值模拟分析，结果表明，即使列车以 350 km/h 的速度运行，沥青混凝土轨道也能确保支撑安全。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Evaluation of long term performance of asphalt concrete track under train speeds and temperatures in service line

Asphalt concrete (AC) tracks are known to reduce maintenance costs and efforts by improving bearing capacity, enhancing the stability and durability of track structures, and reducing vibration and noise. In addition, train operation can be started quickly after asphalt paving is completed, and the track can be quickly restored in the event of major deformation due to derailment, etc., and it is a recyclable material. But one of the most important environmental factors affecting the mechanical properties of asphalt mixtures is temperature, that is, temperature distribution and environmental conditions of asphalt concrete track have influence on the performance. Therefore, in order to verify the temperature effect on asphalt concrete tracks, the pressure acting on the upper surface of the subballast layer and the strain of the lower surface of the asphalt layer were measured during one year of train operation. In this study, the load distribution characteristics, plastic deformation and crack resistance according to temperature, and theoretical and analytical analyses based on domestic and international design standards were conducted for the structure of asphalt concrete track, specifically the asphalt concrete layer and subballast layer. AC tracks are affected by temperature as in previous literature, and show larger values compared to the values of Fixed point load tests, but the pressure of the subballast layer directly underneath the rail is 46.68 kPa to 54.81 kPa, which is within the allowable subballast pressure (133 kPa), and the asphalt layer strain rate also shows a low value of 17.19–21.58με. Through this research, it was confirmed that asphalt concrete track meets the design standards and possesses excellent load distribution characteristics, plasticity, and crack resistance. In addition, numerical simulations were conducted to analyze the influence of train speed, and the results showed that asphalt concrete tracks can ensure safety in terms of support even when a train runs at 350 km/h.

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.