制动力作用下CRTSⅡ型板式无砟轨道层间剪切破坏规律研究
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摘要
层间剪切破坏是CRTSⅡ型板式无砟轨道的主要伤损形式之一。根据CRTSⅡ型板式无砟轨道结构,建立钢轨、轨道板、CA砂浆层、支承层、宽窄接缝三维有限元模型,采用双线性黏结滑移模型模拟CA砂浆层与轨道板间的黏结关系,根据轴距和车辆定距确定轮载与制动力加载位置,研究制动力作用下,不同制动力率、界面参数下轨道板和CA砂浆层间剪切破坏的影响机理。结果表明,制动力率对于界面剪切应力与界面伤损分布影响较小,界面的黏结性能对于制动力作用下的界面剪切应力与界面伤损分布影响较大;制动力对扣件四周的轨道板与CA砂浆界面黏结破坏作用较大,对于板中间位置界面黏结基本无影响;相同制动力作用下,起始伤损位移越小,界面越容易发生伤损;过大的剪切刚度会对层间界面的黏结产生不利影响。
Stress failure of layers is one of the major damages of CRTSⅡ slab track. Based on the structure of CRTSⅡ slab track, the paper establishes the three-dimensional finite element model of rail, slab, CA screed, supporting layer and width joint, simulates the bonding relationship between CA screed and slab by using bilinear bond-slip model, determines the loading position of wheel load and braking power according to wheel base and the length between vehicles, and studies the influence mechanism of the shear failure of CA screed and slab with different braking force rates and interface parameters. The results show that braking force rate has less influence on interface shear stress and damage distribution, while the bonding property has more influence; braking power has more influence on the bonding property of the slab around the fastenings and CA screed. While little influence on that of the middle position of slab; with the same braking power, the smaller initial damage displacement is, the easier damage happens; overlarge shear stiffness would have negative influence on the bonding property of layers.
Stress failure of layers is one of the major damages of CRTSⅡ slab track. Based on the structure of CRTSⅡ slab track, the paper establishes the three-dimensional finite element model of rail, slab, CA screed, supporting layer and width joint, simulates the bonding relationship between CA screed and slab by using bilinear bond-slip model, determines the loading position of wheel load and braking power according to wheel base and the length between vehicles, and studies the influence mechanism of the shear failure of CA screed and slab with different braking force rates and interface parameters. The results show that braking force rate has less influence on interface shear stress and damage distribution, while the bonding property has more influence; braking power has more influence on the bonding property of the slab around the fastenings and CA screed. While little influence on that of the middle position of slab; with the same braking power, the smaller initial damage displacement is, the easier damage happens; overlarge shear stiffness would have negative influence on the bonding property of layers.
引文
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[14]戴公连,粟淼.预制板式无砟轨道界面脱层失效的数值模拟[J].华南理工大学学报(自然科学版),2016,44(7):102-122.
[15]刘学毅,苏成光,刘丹,等.轨道板与砂浆黏结试验及内聚力模型参数研究[J].铁道工程学报,2017,34(3):22-28.
[2]刘钰,赵国堂.CRTSⅡ型板式无砟轨道结构层间早期离缝研究[J].中国铁道科学,2013,34(4):1-6.
[3]周敏,戴公连,闫斌.温度作用下桥上CRTSⅡ型轨道离缝及变形分析[J].铁道科学与工程学报,2016,13(12):2 341-2 346.
[4]田冬梅,邓德华,彭建伟,等.温度对水泥乳化沥青砂浆层与混凝土层间界面黏结影响[J].铁道学报,2013,35(11):78-85.
[5]陈龙,陈进杰,王建西.CRTSⅡ型板式无砟轨道层间传力规律及离缝破坏研究[J].铁道学报,2018,40(8):130-138.
[6]ZHU S Y,CAI C B.Interface damage and its effect on vibrations of slab track under temperature and vehicle dynamic loads[J].International Journal of Non-Linear Mechanics,2014,58:222-232.
[7]钟阳龙,高亮,王璞,等.温度荷载下CRTSⅡ型轨道板与CA砂浆界面剪切破坏机理[J].工程力学,2018,35(2):230-238.
[8]钱程,沈彬然,陈漫,等.桥上CRTSⅡ型纵连板式无砟轨道断轨力作用下梁轨相互作用影响分析[J].中国铁路,2016(4):47-51.
[9]朱乾坤,戴公连,闫斌.简支梁-CRTSⅡ型板式无砟轨道制动力传递规律[J].铁道科学与工程学报,2014,11(6):13-19.
[10]方利,王志强,李成辉.简支梁桥上CRTSⅡ型板式无砟轨道制动力影响因素分析[J].铁道学报,2012,34(1):72-76.
[11]张齐坤,芮一飞,高增增.连续梁桥上CRTSⅡ型板式无砟轨道制动力影响因素分析[J].铁道建筑,2015(6):136-138.
[12]张鹏飞,桂昊,高亮,等.桥上CRTSⅡ型板式无砟轨道制动力影响因素分析[J].铁道工程学报,2018,35(7):30-35,108.
[13]邓少辉.CRTSⅡ型轨道板常见质量问题控制[J].中国铁路,2016(7):56-59.
[14]戴公连,粟淼.预制板式无砟轨道界面脱层失效的数值模拟[J].华南理工大学学报(自然科学版),2016,44(7):102-122.
[15]刘学毅,苏成光,刘丹,等.轨道板与砂浆黏结试验及内聚力模型参数研究[J].铁道工程学报,2017,34(3):22-28.