Effect of Clay Contamination on Stress-Dilatancy Relationships of Ballast Aggregate

被引：0
|
作者：
Chen J. [1 ,2 ]
Gao R. [1 ,2 ]
Liu Y. [1 ,2 ]
Shi Z. [1 ,2 ]
Zhang R. [1 ,2 ]
机构：
[1] School of Civil Engineering, Wuhan University, Wuhan
[2] Key Laboratory of Safety for Geotechnical and Structural Engineering of Hubei Province, Wuhan University, Wuhan
来源：
Xinan Jiaotong Daxue Xuebao/Journal of Southwest Jiaotong University | 2022年 / 57卷 / 06期
关键词：
ballast fouling; direct shear test; geogrid reinforcement; stress-dilatancy relationship;
D O I：
10.3969/j.issn.0258-2724.20200627
中图分类号：
学科分类号：
摘要：
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. © 2022 Science Press. All rights reserved.
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页码：1201 / 1207
页数：6
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