PDF
Full
Outline
The dynamic response of compacted coarse-grained soil as a filling material for the surface layer of railway subgrade bedding is crucial for the overall performance of the subgrade structure under long-term cyclic train loads. This study conducted a series of cyclic triaxial tests to investigate the effects of fine content, confining pressure, and cyclic stress amplitude on the accumulated behavior of coarse-grained soils. The test results indicate that under the same cyclic loading conditions, specimens with higher fine content exhibit less accumulated axial strain. Furthermore, coarse-grained soil specimens exhibit less accumulated axial strain under higher confining pressure or lower cyclic stress amplitudes. Subsequently, the plastic shakedown limit of coarse-grained soils with different fine contents was determined based on a universal shakedown criterion. The results demonstrate that the plastic shakedown limit of coarse-grained soil specimens gradually increases with an increase in fine content. Under higher confining pressure, the corresponding plastic shakedown limit of coarse-grained soil is also higher. Additionally, by plotting the stress state corresponding to the plastic shakedown limit of coarse-grained soil on the plane of p-q, a relationship was established between the coefficient of fine content (FC) and the model parameters in the existing shakedown criterion. A united plastic shakedown criterion is then proposed for coarse-grained soils with different fine contents. The conclusions can provide a theoretical foundation for the design and stability assessment of railway subgrades.
PDF
66
35
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62199257
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
