高铁防水封闭层沥青混凝土冻融损伤演化模型

李进; 石越峰; 肖鑫; 楼梁伟; 蔡德钩; 肖飞鹏

doi:10.3969/j.issn.0258-2724.20220335

高铁防水封闭层沥青混凝土冻融损伤演化模型

doi: 10.3969/j.issn.0258-2724.20220335

李进^1,,
石越峰²,
肖鑫^1,,
楼梁伟²,
蔡德钩²,
肖飞鹏^1, ,

1.
同济大学道路与交通工程教育部重点实验室，上海 201804
2.
中国铁道科学研究院集团有限公司铁道建筑研究所，北京 100081

基金项目: 国家自然科学基金（41972299）；中国国家铁路集团有限公司科技研究开发计划（K2020G032）

详细信息

作者简介:
李进（1996—），男，博士研究生，研究方向为道路与铁路工程，E-mail：lijin0222@tongji.edu.cn

通讯作者:
肖飞鹏（1973—），男，教授，博士生导师，博士，研究方向为道路与铁路工程，E-mail：fpxiao@tongji.edu.cn

中图分类号: U214.3
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- 文章访问数: 110
- HTML全文浏览量: 51
- PDF下载量: 26
- 被引次数: 0
出版历程
- 收稿日期: 2022-05-07
- 修回日期: 2022-11-30
- 网络出版日期: 2023-11-03
- 刊出日期: 2022-12-01

Freeze-Thaw Damage Evolution Model of Asphalt Concrete for Waterproofing Layer in High-Speed Railways

1.
The Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji University, Shanghai 201804, China
2.
Railway Engineering Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing 100081, China

摘要

摘要:
为研究高速铁路防水封闭层用沥青混凝土（简称铁路沥青混凝土）的冻融损伤演化，制备了选用不同沥青和不同目标级配的4种聚合物复合改性铁路沥青混凝土，分析重复冻融循环作用下多温域宏观力学性能的劣化规律. 构建针对冻融损伤演化模型，并对反复冻融循环作用下的损伤度进行计算. 研究发现：4种铁路沥青混凝土在10次冻融循环作用后，各项力学性能指标的残留率均在80%以上；低温断裂能指标对冻融循环次数的增加最为敏感，更能及时反映铁路沥青混凝土的力学性能劣化；基于统计可靠度理论构建的铁路沥青混凝土冻融损伤演化模型的拟合优度值均接近0.99.
- 高速铁路 /
- 防水封闭 /
- 沥青混凝土 /
- 冻融循环 /
- 损伤演化模型
Abstract:
The freeze-thaw damage evolution of asphalt concrete for waterproofing layer in high-speed railways (shorted as railway asphalt concrete) was investigated. Four kinds of composite polymerized railway asphalt concrete were prepared with different asphalt binders and aggregate gradations, and the deterioration of macro mechanical properties in multiple temperature domains under repeated freeze-thaw cycles was evaluated. Models of freeze-thaw damage evolution for railway asphalt concrete were constructed, and the damage degree under the action of repeated freeze-thaw cycles was calculated. The results show that the retained rate of mechanical properties of the four kinds of railway asphalt concrete is still above 80% after 10 freeze-thaw cycles. The low-temperature fracture energy index is the most sensitive to freeze-thaw cycles, which can timely reflect the deterioration of mechanical properties of railway asphalt concrete. The goodness of fit of all freeze-thaw damage evolution models for railway asphalt concrete that are constructed through statistical reliability theory is nearly 0.99.
- high-speed railway /
- waterproofing /
- asphalt concrete /
- freeze-thaw cycle /
- damage evolution model

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图 1 试验方案

Figure 1. Experimental design

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图 2 铁路沥青混凝土在冻融循环下多温域力学性能残留率

Figure 2. Retained rate of mechanical properties of railway asphalt concrete in multiple temperature domains under freeze-thaw cycles

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图 3 冻融循环前后铁路沥青混凝土内部空隙结构的变化

Figure 3. Changes in internal voids structure of railway asphalt concrete before and after freeze-thaw cycles

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图 4 铁路沥青混凝土各项力学性能指标的相关性矩阵

Figure 4. Correlation matrix of mechanical property indexes of railway asphalt concrete

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图 5 冻融损伤演化模型示意

Figure 5. Illustration of freeze-thaw damage evolution model

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图 6 铁路沥青混凝土在重复冻融循环作用下试验测定和模型预估的损伤度

Figure 6. Measured and predicted damage degree of railway asphalt concrete under freeze-thaw cycles

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表 1 铁路沥青混凝土在冻融循环作用下的多温域力学性能劣化规律

Table 1. Deterioration of mechanical properties of railway asphalt concrete in multiple temperature domains under freeze-thaw cycles

铁路沥青混凝土类型	冻融循环次数/次	高温马歇尔稳定度/kN	中温劈裂强度/MPa	低温
铁路沥青混凝土类型	冻融循环次数/次	高温马歇尔稳定度/kN	中温劈裂强度/MPa	断裂能/（J·m⁻²）	断裂韧性/（N·mm⁻¹）
A-AC13	0	15.17	1.332	1613.31	45.04
	5	14.53	1.286	1544.35	43.83
	10	12.42	1.204	1425.63	41.79
	15	11.41	1.235	1387.06	41.49
	20	11.52	1.246	1283.29	41.35
A-AC10	0	16.96	1.370	1775.90	47.77
	5	15.23	1.357	1550.55	46.19
	10	13.85	1.282	1457.35	46.28
	15	13.95	1.317	1300.80	45.26
	20	11.95	1.350	1190.75	44.56
B-AC13	0	13.64	1.100	1816.15	50.20
	5	12.97	1.020	1624.46	49.80
	10	10.36	0.957	1561.45	47.02
	15	9.99	0.997	1466.08	47.70
	20	9.79	1.021	1362.22	45.66
B-AC10	0	14.76	1.118	2017.68	52.17
	5	13.28	1.063	1898.64	48.68
	10	11.50	0.986	1691.99	47.22
	15	10.76	1.030	1572.85	46.91
	20	10.76	1.079	1498.54	48.04

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表 2 铁路沥青混凝土冻融损伤演化模型参数拟合结果

Table 2. Fitted parameters of freeze-thaw damage evolution model of railway asphalt concrete

沥青混凝土类型	$ \alpha $	$ {\lambda _0} $	$ \nu $/×10⁻⁷	判定系数
A-AC13	1.0327	0.01151	0.1	0.9841
A-AC10	0.7311	0.01359	0.1	0.9859
B-AC13	0.7541	0.00915	0.1	0.9888
B-AC10	0.9902	0.01290	0.1	0.9827

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