离缝修复条件下无砟轨道板温度翘曲变形特征

Warping Features of Ballastless Track-Slab Under Debonding-Repaired Condition

摘要:

根据高速铁路无砟轨道离缝修复工艺，基于双线性内聚力模型理论，采用内聚力单元模拟层间粘结界面，建立考虑多界面粘结的CRTSⅡ型板式无砟轨道有限元模型。计算分析了无砟轨道板在温度梯度-50 ℃·m^-1~+100 ℃·m^-1、温升温降-30 ℃~+30 ℃作用下的翘曲变形，结果表明：离缝修复条件下，在计算范围内温度荷载作用时，轨道板翘曲变形模式和最值与正常状态一致，说明离缝修复使无砟轨道板温度翘曲变形得到恢复。

关键词:无砟轨道;离缝修复;轨道板;温度荷载;翘曲变形

Abstract:

Based on the construction technology of the debonding repairment applied to the high speed railway ballastless track， the interlayer interfaces were simulated by adapting cohesive element based on the bilinear cohesive zone model， and a finite element model of II slab track of China railway track system （CRTS） was established with full consideration of multi-interface bonding properties. The warping features of the ballastless track-slab were calculated and analyzed at the temperature gradient loads from -50 ℃·m^-1 to ＋100 ℃·m^-1 and the temperature change loads from －30 ℃ to 30 ℃， respectively. The results show that within the range of the temperature loads in this paper， under the debonding-repaired condition， the warping modes and the warping extremes of the track-slab are consistent with the normal state， which indicates that the debonding repairment has restored the warping of the track-slab.

Key words:ballastless track;debonding repairment;track-slab;temperature load;warping