黏土脏污对道砟集料的应力-剪胀关系影响

陈静; 高睿; 刘洋泽鹏; 石知政; 张荣隆

doi:10.3969/j.issn.0258-2724.20200627

黏土脏污对道砟集料的应力-剪胀关系影响

doi: 10.3969/j.issn.0258-2724.20200627

陈静^{1, 2,},
高睿^{1, 2, ,},
刘洋泽鹏^{1, 2},
石知政^{1, 2},
张荣隆^{1, 2}

1.
武汉大学土木建筑工程学院，湖北武汉 430072
2.
武汉大学岩土与结构工程安全湖北省重点实验室，湖北武汉 430072

基金项目: 国家自然科学基金（51178358，51878521）

详细信息

作者简介:
陈静（1994—），女，博士研究生，研究方向为道路与铁道工程，E-mail：chenjing_whu@hotmail.com

通讯作者:
高睿（1975—），男，教授，博士，研究方向为道路与铁道工程，E-mail：gaorui@whu.edu.cn

中图分类号: U213.7
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- 被引次数: 0
出版历程
- 收稿日期: 2020-09-14
- 修回日期: 2021-04-21
- 网络出版日期: 2022-08-03
- 刊出日期: 2021-04-29

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

CHEN Jing^{1, 2
,},
GAO Rui^{1, 2
, ,},
LIU Yangzepeng^{1, 2},
SHI Zhizheng^{1, 2},
ZHANG Ronglong^{1, 2}

1.
School of Civil Engineering, Wuhan University, Wuhan 430072, China
2.
Key Laboratory of Safety for Geotechnical and Structural Engineering of Hubei Province, Wuhan University, Wuhan 430072, China

摘要

摘要:
列车循环荷载下，铁路地基层中的黏土颗粒会逐渐侵入道砟层，降低道床承载性能. 通过开展一系列大型直剪试验，对黏土脏污质污染下的受格栅加筋道砟集料和未受格栅加筋道砟集料的强度及变形发展、应力-剪胀关系进行了研究. 试验结果表明：随着脏污程度的增加，道砟集料在剪切过程中强度及法向变形均降低；干净道砟集料的应力比与剪胀比呈一阶线性关系，而黏土污染的道砟集料塑性增强，在剪应力峰值状态下剪胀比更高而抗剪强度发展缓慢，导致应力比与剪胀比呈二阶多项式关系；高法向压力下，道砟集料具有更低的剪胀比；黏土脏污质的存在会减小道砟集料的变形破坏速率，但降低了集料的抗剪强度，而格栅的加筋作用可弥补由于黏土脏污引起的强度降低.
- 格栅加固 /
- 道床脏污 /
- 直剪试验 /
- 应力-剪胀关系
Abstract:
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.
- geogrid reinforcement /
- ballast fouling /
- direct shear test /
- stress-dilatancy relationship

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图 1 大型直剪设备

Figure 1. Apparatus of large-scale direct shear tests

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图 2 道砟及黏土脏污质级配图

Figure 2. Size distribution of ballast and clay fine

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图 3 试验所用材料

Figure 3. Materials for the large-scale direct shear test

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图 4 受格栅加筋与未受格栅加筋道砟τ_s及δ_n与δ_s关系

Figure 4. Relationships of shear stress τ_s vs. shear displacement δ_s and relationships of normal displacement δ_n vs. shear displacement δ_s for geogrid-reinforced and unreinforced ballast

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图 5 τ_s/σ_n-δ_n/δ_s关系

Figure 5. Relationships between τ_s/σ_n and δ_n/δ_s

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图 6 τ_s/σ_n-δ_n/δ_s关系曲线

Figure 6. Relationships between τ_s/σ_n and δ_n/δ_s

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表 1 道砟及黏土脏污质工程性能指标表

Table 1. Engineering properties of clean ballast and clay fines

材料	比重	堆积密度/ （kg·m⁻³）	e	ω_L/ %	ω_P/ %	D₅₀/ mm	C_u	C_c
道砟	2.66	1432	0.858			39.0	1.15	1.75
黏土	2.70	1178	1.207	42.10	22.40	1.3	24.29	1.34

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表 2 格栅参数表

Table 2. Mechanical properties of geogrid

参数	规格
孔径形式	双向孔径 55 mm × 55 mm
材料	聚丙烯
2% 应变时抗拉强度/（kN·m⁻¹）	11
5% 应变时抗拉强度/（kN·m⁻¹）	15
峰值抗拉强度/（kN·m⁻¹）	30
屈服点伸长率/%	13

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表 3 试样设置情况表

Table 3. Details of experimental specimens

VCI/%	试样编号	格栅布置	黏土质量/kg
0	S1-1	格栅加筋
0	S1-2	格栅加筋
20	S2-1	格栅加筋	21.70
20	S2-2	格栅加筋	21.70
40	S3-1	格栅加筋	43.40
40	S3-2	格栅加筋	43.40

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