土工格栅对受污道砟直剪特性影响的试验研究

doi:10.3969/j.issn.0258-2724.20191142

高睿^{1, 2,},
石知政^{1, 2},
刘洋泽鹏^{1, 2},
陈静^{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:
高睿（1975—），男，教授，研究方向为岩土工程，E-mail：gaorui@whu.edu.cn

中图分类号:U213.7
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出版历程
- 收稿日期:2019-11-28
- 修回日期:2020-05-08
- 网络出版日期:2020-07-21
- 刊出日期:2020-07-21

Experimental Study on Effect of Geogrid on Direct Shear Behavior of Contaminated Ballast

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

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

摘要

摘要:
为探究土工格栅对受黏土污染道砟力学特性的影响，通过对4种法向压力、3种黏土污染程度下土工格栅加固的道砟试样进行一系列直剪试验，对比分析土工格栅对道砟试样剪切强度和剪切变形的影响，研究了考虑黏土污染情况下土工格栅对道砟的加固效果. 研究结果表明：土工格栅增大了洁净及受黏土污染道砟试样的剪切强度，当污染指标VCI （void contamination index）为20%时提升峰值剪切强度最大达到24%；道砟剪切强度表现出典型的非线性特征，非线性强度准则拟合参数与道砟污染程度利用指数函数拟合，拟合结果可作为实际工程受污染道砟强度估计的依据；土工格栅可减小试样的最大剪胀量，同时可减小约0.7°～3.7° 的峰值剪胀角，并且在VCI为20%时土工格栅加固的效果最为明显.
- 格栅加固/
- 黏土污染/
- 直剪试验/
- 剪切特性/
- 道砟
Abstract:
In order to investigate the effect of geogrid on the mechanical properties of clay-contaminated ballast, a series of direct shear tests were carried out on geogrid-reinforced ballast specimens under four normal pressures and three degrees of clay pollution. The effects of geogrid on the shear strength and shear deformation of ballast specimens were compared and analyzed. The reinforcement effect of geogrid on ballast with consideration of clay pollution was studied. The results show that the geogrid can increase the shear strength of clean and clay-contaminated ballast samples, and the peak shear strength reaches 24% when the void contamination index (VCI) is 20%. Ballast shear strength exhibits typical non-linear characteristics, and the relationship between fitting parameters of non-linear strength criterion and pollution degrees can be fitted by an exponential function. The fitting results can be used as the basis for strength estimation of contaminated-ballast in practical engineering. Meanwhile, geogrid can reduce the maximum dilatancy of the sample; it can also reduce the peak dilatancy angle by about 0.7°～3.7°, and achieve its maximum reinforcement effect at the VCI of 20%.
- geogrid reinforcement/
- clay fouling/
- direct shear test/
- shear properties/
- ballast

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图 1道砟试样级配

Figure 1.Particle size distribution of ballast samples

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图 2试验土工格栅

Figure 2.Diagram of geogrid used in the experiment

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图 3试验装置

Figure 3.Diagram of direct shear test apparatus

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图 4剪切强度与水平位移关系曲线

Figure 4.Shear stress-shear displacement curves of ballast samples

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图 5不同污染程度下道砟强度包络图

Figure 5.Strength envelops of ballast at different VCIs

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图 6非线性强度准则参数拟合曲线

Figure 6.Fitting curves by nonlinear failure criterion

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图 7法向位移与水平位移关系曲线

Figure 7.Vertical displacement versus horizontal displacement curves

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图 8峰值剪胀角与污染程度关系

Figure 8.Relationship between the peak friction angle and VCI under various normal stress

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表 1试验材料参数表

Table 1.Physical properties of test materials

材料	堆积密度ρ/（kg•m⁻³）	比重d	孔隙比e	含水率ω/%	液限/%	塑限/%
道砟	1432	2.66	0.858
黏土	1178	2.70	1.292	22.2	42.1	22.4

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表 2土工格栅参数表

Table 2.Physical and technical properties of geogrid

材料	类型	孔径/mm	空隙率/%	极限抗拉强度/（kN•m⁻¹）
聚丙烯	双向方形格栅	55 × 55	81	30

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表 3试验方案

Table 3.Experiment schemes

试验组别	试样编号	VCI/%	法向压力/kPa
有格栅	1 号	0	15、35、55、75
	2 号	20
	3 号	40
无格栅	4 号	0	15、35、55、75
	5 号	20
	6 号	40

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表 4峰值剪切强度数据

Table 4.Results of peak shear stress

试样编号	σ_n=15 kPa	σ_n=35 kPa	σ_n=55 kPa	σ_n=75 kPa
1 号	80.28	130.28	155.44	178.19
2 号	74.17	115.28	141.53	169.03
3 号	58.19	94.03	128.89	153.47
4 号	70.42	94.10	140.28	164.93
5 号	54.44	84.44	136.04	149.72
6 号	46.81	67.64	111.39	141.94

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