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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Resilient modulus of fine-grained subgrade soil considering load interval: An experimental study
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Resilient modulus of fine-grained subgrade soil considering load interval: An experimental study

机译：考虑负载间隔的细粒细化土壤弹性模量：实验研究

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摘要

On automatic block lines, there is a time interval between two trains traveling on a track in the same direction. Therefore, the dynamic load on the railway subgrade is composed of the periodic vibrations generated when the train passes, and the intermittent period when there is no train passing. To study the influence of the train interval time on the dynamic behavior of a railway subgrade, a series of dynamic triaxial tests of heavy-haul railway subgrade soil were conducted under consecutive cyclic loading and intermittent cyclic loading, while considering the interval time. The variation laws of the resilient moduli of specimens with different moisture contents and stress states with loading cycles under the two loading modes were compared and analyzed, and the influence of the load interval on the resilient modulus was discussed. The results showed that the load interval improved the resilient modulus of a specimen and its ability to resist failure. When the specimen was in a saturated state, its resilient modulus tended to increase with an increase in the intermittency period. A prediction model considering the soil stress state and load interval was proposed, based on introducing a factor k(4) to quantify the effect of the load interval on the resilient modulus.
机译：在自动块线上，在相同方向上的轨道上行驶的两个列车之间存在时间间隔。因此，铁路路基上的动态负荷由火车通过时产生的周期性振动以及没有列车通过时的间歇时期。为研究火车间隔时间对铁路路基动态行为的影响，在考虑间隔时间的同时，在连续循环加载和间歇性循环加载下进行一系列动态三轴试验。比较和分析具有不同水分含量和带载荷循环的样品的弹性模态的变化规律，并分析了载荷间隔对弹性模量的影响。结果表明，负载间隔改善了样本的弹性模量及其抵抗失效的能力。当样品处于饱和状态时，其弹性模量随着间歇性期的增加而增加。提出了考虑土壤应力状态和负载间隔的预测模型，基于引入因子k（4）来量化负载间隔对弹性模量的影响。

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