| 大温差戈壁地区高速铁路无砟轨道混凝土开裂研究 |
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| 引用本文： | 胡锐鹏,张戎令,王朦诗,郭海贞,李华,娄许煜.大温差戈壁地区高速铁路无砟轨道混凝土开裂研究[J].硅酸盐通报,2018,37(6):2042-2047. |
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| 作者姓名： | 胡锐鹏 张戎令 王朦诗 郭海贞 李华 娄许煜 |
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| 作者单位： | 兰州交通大学甘肃省道路桥梁与地下工程重点实验室,兰州,730070;兰州交通大学甘肃省道路?帕河氲叵鹿こ讨氐闶笛槭?兰州 730070;兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室,兰州 730070 |
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| 基金项目： | 青年人才托举工程(2015QNRC001)%飞天学者特聘计划%陇原青年创新人才扶持计划%长江学者和创新团队发展计划滚动支持(IRT_15R29)%甘肃省基础研究创新群体(145RJIA332)%兰州交通大学优秀平台资助(201606) |
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| 摘 要： | 针对兰新二线无砟轨道修建后道床板混凝土出现的早期开裂等耐久性问题,在室内进行1:1足尺模型试验,利用人工气候模拟箱模拟西北地区的大温差恶劣环境,从早期水化热温度场的分布及变化规律以及变形等方面研究无砟轨道道床板混凝土开裂机理,建立道床板混凝土水化温度场与西北地区大气温度环境的关系;同时,通过有限元软件模拟计算水化热温度场,计算结果与室内试验结果进行对比.研究结果表明:大温差恶劣环境是导致道床板开裂的主要原因,道床板温度场与环境温度呈周期变化,越靠近道床板表面温度梯度越大,越容易产生裂缝.
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| 关 键 词： | 大温差 无砟轨道 温度场 有限元 |
Experimental Study on the Cracking of Concrete about the High Speed Railway in Big Temperature Difference Area of Gobi |
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| HU Rui-peng,ZHANG Rong-ling,WANG Meng-shi,GUO Hai-zhen,LI Hua,LOU Xu-yu.Experimental Study on the Cracking of Concrete about the High Speed Railway in Big Temperature Difference Area of Gobi[J].Bulletin of the Chinese Ceramic Society,2018,37(6):2042-2047. |
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| Authors: | HU Rui-peng ZHANG Rong-ling WANG Meng-shi GUO Hai-zhen LI Hua LOU Xu-yu |
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| Abstract: | In view of the early crack and other durability problems of concrete slab of ballast bed after the construction of LanXin second-line ballastless track, 1:1 full-scale model tests in laboratory simulation. Using artificial climate simulation box to simulate the great temperature difference in Northwest China, the cracking mechanism of ballastless track slab of ballastless track is studied from the aspects of distribution, variation and deformation of early hydration heat field, establishing the relationship between the temperature field of concrete hydration temperature and the atmospheric temperature environment in Northwest China.At the same time, the temperature field of hydration heat is simulated by finite element software, and the calculated results are compared with the indoor test results.The results show that: The large temperature difference and abominable environment are the main causes of the cracking of the bed slab.The temperature field and the environmental temperature change periodically.Closer to the surface of bed plate, the larger temperature gradient is, the more likely to create cracks. |
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| Keywords: | large temperature difference ballastless track temperature field finite element |
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