The Influence of Cyclic Loading Frequency on the Response of an Unsaturated Railway Formation Soil
The Influence of Cyclic Loading Frequency on the Response of an Unsaturated Railway Formation Soil
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循环加载频率对非饱和铁路地层土响应的影响
DOI：
10.1061/9780784484050.029
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Kumar A
中科院分区：
文献类型：
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作者：
Kumar A
本文介绍了对从南非煤炭线路的铁路路基中回收的非饱和土样品进行循环三轴试验的结果，以研究循环加载频率对地层材料（在本例中为粘土砂）的影响。测试涉及吸力监控的重复负载测试，考虑了在不同列车速度下实际可能遇到的情况。将频率在 0.5–4 Hz 范围内单独施加的单级负载测试的结果与频率从 1 Hz 增加到 4 Hz 的多级负载测试的结果进行比较。单级加载试验的结果表明，累积轴向应变随着循环频率的增加而增加，这意味着较高的列车速度将导致较高水平的永久变形。多级加载试验频率的阶段性增加表明，永久变形主要发生在第一组循环载荷期间，而在随后的重复载荷期间测得的变形可以忽略不计。循环加载过程中吸力的降低和饱和度的增加取决于样品的保水状态。然后根据弹性模量解释结果。
This paper presents the results of cyclic triaxial tests conducted on unsaturated soil samples recovered from the railway embankment of a South African coal line to investigate the influence of cyclic loading frequency on a formation layer material, in this case a clayey sand. The testing involved suction-monitored repeated loading tests accounting for the conditions likely to be encountered in practice under varying train speed. The results of single-stage loading tests with a frequency applied individually in a range of 0.5–4 Hz were compared to the results of multistage loading tests with a frequency increasing from 1 to 4 Hz. The results of the single-stage loading tests indicated that the accumulated axial strain increased with an increase in the cyclic frequency, implying that a higher train speed would result in a higher level of the permanent deformation. The staged increase in the frequency of the multistage loading tests showed that the permanent deformation mainly took place during the first packet of cyclic loads whereas the deformations measured during the following repeated loads were negligible. Suction reduction and an increase in degree of saturation during cyclic loading was dependent on the water-retention state of the sample. The results were then interpreted in terms of resilient modulus.
交通和环境循环作用下粘土砂的循环和保水响应耦合
DOI：
10.1680/jgeot.21.00063
发表时间：
2023
期刊：
Géotechnique
影响因子：
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作者：
Azizi A
通讯作者：
Azizi A
干湿率对土壤保水曲线测量的影响
影响因子：
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作者：
Azizi A
通讯作者：
Azizi A