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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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。
In view of the early crack and other durability problems of concrete slab of ballast bed after the construction of Lan Xin 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.
In view of the early crack and other durability problems of concrete slab of ballast bed after the construction of Lan Xin 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.
引文
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[11]刘钰,陈攀,赵国堂.CRTSⅡ型板式无砟轨道结构早期温度场特征研究[J].中国铁道科学,2014,35(1):1-6.
[12]吴斌,张勇,曾志平,等.温度及收缩荷载下路基上双块式无砟轨道力学及裂缝特性研究[J].铁道科学与工程学报,2011,8(1):19-23.
[2]董亮,赵成刚,蔡德钩,等.高速铁路无砟轨道路基动力特性数值模拟和试验研究[J].土木工程学报,2008(10):81-86.
[3]王森荣,孙立,李秋义,等.无砟轨道轨道板温度测量与温度应力分析[J].铁道工程学报,2009(2):52-55.
[4]吴斌,刘参,曾志平,等.CRTSⅡ型板式无砟轨道温度场特征研究[J].铁道工程学报,2016,33(3):29-33.
[5]闫斌,刘施,戴公连,等.我国典型地区无砟轨道非线性温度梯度及温度荷载模式[J].铁道学报,2016,38(8):81-86.
[6]欧祖敏,孙璐,程群群.基于气象资料的无砟轨道温度场计算与分析[J].铁道学报,2014,36(11):106-112.
[7]徐桂弘,刘学毅,杨荣山,等.列车荷载-水耦合作用下CRTSⅡ型板式无砟轨道道床裂纹扩展研究[J].铁道学报,2014,36(10):76-80.
[8]杨荣山,万章博,刘学毅,等.CRTSⅠ型双块式无砟轨道冬季温度场试验[J].西南交通大学学报,2015,50(3):454-460.
[9]戴公连,温学桧,苏海霆.寒冷季节桥上无砟轨道横竖向温度梯度研究[J].华中科技大学学报(自然科学版),2015,43(7):1-5.
[10]李健,赵坪锐,万章博,等.双块式无砟轨道温度场试验研究和数值分析[J].中国科学:技术科学,2014,44(7):729-735.
[11]刘钰,陈攀,赵国堂.CRTSⅡ型板式无砟轨道结构早期温度场特征研究[J].中国铁道科学,2014,35(1):1-6.
[12]吴斌,张勇,曾志平,等.温度及收缩荷载下路基上双块式无砟轨道力学及裂缝特性研究[J].铁道科学与工程学报,2011,8(1):19-23.
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