不同脏污质对格栅加筋道砟性能的影响

陈静; 高睿; 刘洋泽鹏; 张荣隆; 石知政

doi:10.3969/j.issn.0258-2724.20200307

不同脏污质对格栅加筋道砟性能的影响

doi: 10.3969/j.issn.0258-2724.20200307

武汉大学土木建筑工程学院, 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: 2020-05-20
- 录用日期: 2021-11-05
- 修回日期: 2020-07-01
- 网络出版日期: 2021-11-16
- 刊出日期: 2020-07-07

Influence of Various Fouling Materials on Geogrid-Reinforced Ballast Performance

School of Civil Engineering, Wuhan University, Wuhan 430072, China

摘要

摘要:
加筋格栅广泛应用于有砟轨道中以提高道床承载及侧向抗变形性能. 由于受到来自行进列车落下的煤渣或底砟及地基层翻冒的泥浆等的污染，格栅加筋道砟集料的力学性能会受到严重影响. 选用黏土、煤渣两种有砟铁路常见脏污杂质，对格栅加筋道砟开展了不同法向压力、不同脏污程度下的大型直剪试验，对比研究了不同脏污质对格栅加筋道砟的抗剪强度、峰值摩擦角、法向剪胀位移以及峰值剪胀角的影响差异，并分析了其差异产生的力学机制. 试验结果表明：脏污质的存在会降低格栅加筋道砟的抗剪强度和峰值摩擦角，并减小试样的法向剪胀位移和峰值剪胀角；相较于受黏土污染的格栅加筋道砟，受煤渣污染的集料具有更低的抗剪强度和峰值摩擦角，以及更高的法向剪胀位移和峰值剪胀角，表明煤渣脏污对格栅加筋道砟的力学性能会产生更加不利的影响.
- 格栅加固 /
- 道床脏污 /
- 直剪试验 /
- 剪切性能
Abstract:
Geogrid has been widely adopted in ballasted railways to improve the bearing capacity of ballast and its resistance to lateral deformation. The mechanical properties of geogrid-reinforced ballast aggregate are seriously affected by contaminants of coals falling from the moving hauls or clay fines from ballast layer and subgrade. A series of large-scale direct shear tests of geogrid-reinforced ballast under different normal pressures and various fouling levels were performed using the two common fouling substances of ballasted railway, i.e., clays and coals. The effects of the two fouling materials on the shear strength, peak friction angle, vertical dilatant displacement, and peak dilatant angle of the geogrid-reinforced ballast were compared and analyzed, and the mechanical mechanism that contributes to the different performances was also explored. The results showed that the presence of fouling materials decreases the shear strength and peak friction angle of geogrid-reinforced ballast, but reduces its vertical dilatant displacement and peak dilatant angle. Compared with that fouled by clay fines, the ballast fouled by coals exhibits a lower shear strength and peak friction angle, and a larger vertical dilatant displacement and peak dilatant angle, indicating increasingly adverse impacts on the mechanical performances of geogrid-reinforced ballast.
- geogrid reinforcement /
- ballast fouling /
- direct shear test /
- shearing performance

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图 1 大型直剪设备

Figure 1. Large-scale direct shear test equipment

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图 2 道砟级配

Figure 2. Size distribution of ballast particles

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图 3 试验用土工格栅

Figure 3. Geogrid used in the experiments

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图 4 不同脏污情况下受格栅加固与未受格栅加固道砟剪切应力τ_s与剪切位移 Δ_s的关系

Figure 4. Relationships between τ_s and Δ_s for geogrid-reinforced and unreinforced ballast under various fouling levels

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图 5 峰值强度τ_smax与法向压力σ_n关系

Figure 5. Relationships between peak shearing strength τ_smax and normal stress σ_n

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图 6 黏土及煤渣污染示意

Figure 6. Schematic diagram of ballast aggregates fouled by clays and coals

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图 7 Φ_max与σ_n关系

Figure 7. Relationships between peak friction angle Φ_max and normal stress σ_n

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图 8 不同脏污情况下受格栅加固与未受格栅加固道砟Δ_n与Δ_s关系

Figure 8. Relationships between Δ_n and Δ_s for geogrid-reinforced and unreinforced ballast under various fouling levels

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图 9 σ_n = 55 kPa时Δ_n与Δ_s关系

Figure 9. Relationships between normal displacement Δ_n and shearing displacement Δ_s under σ_n=55 kPa

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图 10 ϕ_max 与σ_n关系

Figure 10. Relationships between ϕ_max and σ_n

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表 1 道砟及脏污质相关力学指标

Table 1. Mechanical indexes of ballast and fouling substances

名称	比重	堆积密度/ （kg•m⁻³）	含水率/%	孔隙比 e	液限ω_L/%	塑限ω_P/%
道砟	2.66	1432		0.858
黏土	2.70	1178	22.2	1.207	42.10	22.40
煤渣	1.22	715		0.707

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表 2 格栅参数

Table 2. Physical and technical properties of geogrid

格栅参数	数值
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

Table 3. Details of experimental specimens

类型	试样编号	脏污质种类	VCI/%	法向压力 σ_n/kPa
含格栅	GN1	黏土	0	15、35、55、75
	GN2		20
	GN3		40
	GM1	煤渣	0	15、35、55、75
	GM2		20
	GM3		40
不含格栅	N1	黏土	0	15、35、55、75
	N2		20
	N3		40
	M1	煤渣	0	15、35、55、75
	M2		20
	M3		40

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