首页|层间损伤对道岔区板式无砟轨道力学行为的影响机制

层间损伤对道岔区板式无砟轨道力学行为的影响机制

Influence Mechanism of Interlayer Damage on Mechanical Behavior of Slab Ballastless Track in Turnout Area

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针对高速铁路板式无砟道岔结构层间损伤,建立其层间损伤动力学评估模型,分析了层间损伤对道岔区轨道结构固有振动特性的影响;以直向过岔为例,耦合温度梯度荷载,研究了层间损伤对无砟道岔轨道结构的动力学影响机制,并给出相应的离缝评估及轨道维护检测建议.结果表明:层间损伤会导致无砟道岔轨道板固有频率下降,对高阶模态的影响更为显著;层间损伤与昼间正温度梯度效应耦合对板式无砟道岔的动力学响应特性造成更大的影响,结构层间拍击作用显著,极端情况下可能造成位移等动力学指标超限.建议对复杂温度地区的无砟道岔轨道板翘曲位移加强监测,同时昼间板中翘曲位移峰值报警阈值设为不超过1.0 mm.
Regarding the interlayer damage of high speed railway slab ballastless turnout structures,a dynamic evaluation model for interlayer damage of ballastless turnout track structure was established,and the influence of interlayer damage on the natural vibration characteristics of track structure in the turnout area was analyzed.Taking the straight turnout as an example,coupled with temperature gradient loads,the dynamic influence mechanism of interlayer damage on the track structure of ballastless turnouts was studied,and corresponding gap evaluation and track maintenance inspection suggestions were given.The results indicate that interlayer damage can lead to a decrease in the natural frequency of ballastless turnout track slabs,with a more significant impact on higher-order modes.The occurrence of interlayer damage coupled with the diurnal positive temperature gradient effect has a greater impact on the dynamic response characteristics of slab ballastless turnouts.The beat impact of the interlayer structure is significant,and in extreme cases,it may cause displacement and other dynamic indicators to exceed the limit.It is recommended that the deflection displacement of ballastless turnout track slabs in complex temperature zone should be monitored,and the peak deflection displacement in the slab during the daytime should not exceed 1.0 mm.

passenger dedicated lineCRTS Ⅲ slab ballastless trackturnoutinterlayer damagegapinherent vibration characteristicsdynamic characteristics

赵闻强、赵云哲、刘心成

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浙江省交通投资集团有限公司 智慧交通研究分公司,杭州 310000

中铁第四勘察设计院集团有限公司,武汉 430063

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

客运专线 CRTS Ⅲ型板式无砟轨道 道岔 层间损伤 离缝 固有振动特性 动力学特性

浙江省交通厅科技项目浙江省交通投资集团有限公司智慧交通研究分公司科技项目

2024039202205

2024

10.3969/j.issn.1003-1995.2024.08.03

铁道建筑
中国铁道科学研究院

铁道建筑

北大核心
影响因子：0.623
ISSN：1003-1995
年,卷(期)：2024.64(8)