- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | CHEN Jing, GAO Rui, LIU Yangzepeng, SHI Zhizheng, ZHANG Ronglong. Effect of Clay Contamination on Stress-Dilatancy Relationships of Ballast Aggregate[J]. Journal of Southwest Jiaotong University, 2022, 57(6): 1201-1207. doi: 10.3969/j.issn.0258-2724.20200627
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Clay fines from subgrade would gradually intrude into the ballast layer under cyclic loadings of passing trains, which would reduce the bearing capacity and impede the free drainage of track beds. A series of large-scale direct shear tests were carried out to investigate the strength and deformation characteristics and stress-dilatancy relationship of the geogrid-reinforced and unreinforced ballast contaminated by clay fines. The results showed that the strength and normal displacement of ballast aggregate decrease with an increase in the contamination level. The stress ratio of clean ballast is linear with the dilatancy ratio, while the addition of clay fines would increase the plasticity of the ballast aggregate. For fouled ballast in the peak state of shear stress, the dilatancy ratio of aggregate increases while the shear strength decreases, and a second-order polynomial relationship between stress ratio and dilatancy ratio is observed. Under a higher normal pressure, the aggregates have a lower dilatancy ratio. The reduction in the dilatancy rate and the shear strength of clay-contaminated ballast can be remedied by the inclusion of geogrid in the aggregate.
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