Abstract Understanding the permanent deformation characteristics of subgrade soils under traffic loads can provide a basis for subgrade design and evaluation. During repeated load triaxial (RLT) tests, accurate simulation of traffic loads is critical. RLT tests on silt under continuous loading and intermittent loading (cycles of continuous loading and intermittent stage) were performed using an RLT apparatus. The effects of the intermittent stage on the development of axial strain, pore water pressure and accumulated plastic strain were analyzed, and the dynamic behaviors of accumulated plastic strain under intermittent loading were also studied. The results show that the existence of the intermittent stage plays an active role in dissipating pore water pressure and improving the ability of the specimen to resist permanent deformation. Based on shakedown concept, an expression of critical stress and a prediction model for the accumulated plastic strain of silt under intermittent loading were proposed. The research results provide reference values for understanding the permanent deformation characteristics of silt.

中文翻译：

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间断加载下细粒路基土永久变形特征

摘要 了解路基土在交通荷载作用下的永久变形特性，可为路基设计和评价提供依据。在重复载荷三轴 (RLT) 测试期间，交通载荷的准确模拟至关重要。使用 RLT 设备在连续加载和间歇加载（连续加载和间歇阶段的循环）下对淤泥进行 RLT 测试。分析了间歇阶段对轴向应变、孔隙水压力和累积塑性应变发展的影响，并研究了间歇加载下累积塑性应变的动力学行为。结果表明，间歇阶段的存在对消散孔隙水压力和提高试件抵抗永久变形的能力具有积极作用。基于稳定概念，提出了断续加载下淤泥累积塑性应变的临界应力表达式和预测模型。研究结果为了解淤泥永久变形特征提供了参考价值。