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<p>With the rapid development of heavy-haul railway construction in the loess regions of northwest China, the dynamic loads imparted by trains on loess-filled subgrades have increased, threatening the long-term stability of the heavy-haul railway subgrades. Under the action of dynamic loading, the dynamic deformation characteristics of the subgrades directly affect the long-term subgrade stability. The dynamic loading can readily reorganize subgrade filler particles and form an unstable structure, threatening the service performance of the subgrade. In the present study, dynamic triaxial testing is conducted in the laboratory to explore the effects of coarse particle content, compaction degree, and moisture content on the dynamic characteristics of improved loess subgrade filler. Through this testing, a dynamic deformation model of improved loess subgrade filler is constructed, and the internal evolution mechanism of its macroscopic dynamic behavior is revealed at the meso-structure level of soil. This work will help ensure that improved loess subgrade filler has sufficient anti-deformation ability under dynamic loads, promoting the development of efficient heavy-haul railway transportation in China.</p>

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Multi-Scale Mechanical Characterization of Improved Loess Under Dynamic Load and Determination of Characteristic Value of Coarse Particle Content

  • 期刊论文

  • 发表日期：

    2026年1月1日

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  • Zihao Zhou,
  • Yang Bai,
  • Zhuang Guo

摘要

With the rapid development of heavy-haul railway construction in the loess regions of northwest China, the dynamic loads imparted by trains on loess-filled subgrades have increased, threatening the long-term stability of the heavy-haul railway subgrades. Under the action of dynamic loading, the dynamic deformation characteristics of the subgrades directly affect the long-term subgrade stability. The dynamic loading can readily reorganize subgrade filler particles and form an unstable structure, threatening the service performance of the subgrade. In the present study, dynamic triaxial testing is conducted in the laboratory to explore the effects of coarse particle content, compaction degree, and moisture content on the dynamic characteristics of improved loess subgrade filler. Through this testing, a dynamic deformation model of improved loess subgrade filler is constructed, and the internal evolution mechanism of its macroscopic dynamic behavior is revealed at the meso-structure level of soil. This work will help ensure that improved loess subgrade filler has sufficient anti-deformation ability under dynamic loads, promoting the development of efficient heavy-haul railway transportation in China.