CA砂浆层掉块对无砟轨道变形影响分析

Analysis on influence of CA mortar layer falling off on deformation of ballastless track

CA砂浆层掉块会对无砟轨道结构的变形产生较大影响,甚至危及行车安全性。基于CA砂浆的粘弹特征,在CRTSⅠ型板式轨道动力分析中,通过调用10℃,20℃,30℃时CA砂浆的粘弹性参数,分析CA砂浆层不同掉块长度对无砟轨道结构变形的影响规律。研究结果表明:CA砂浆层板中掉块长度扩展导致轨道板垂向位移峰值增大,底座板垂向位移峰值减小,轨道板与底座板间的相对位移增加;调用不同温度的CA砂浆粘弹性参数时,随着温度升高,轨道板的垂向位移峰值有所增大,底座板垂向位移峰值逐渐减小,轨道板与底座板的相对位移逐渐增加;但在10℃~30℃温度区间,动荷载短期作用,CA砂浆粘弹性变化对轨道结构变形影响并不显著;掉块破坏危害严重,应进行早期预防,运行时严格监控,发现后及时修复。

The loss of CA mortar layer will have a greater impact on the deformation of the ballastless track structure, and even endanger the safety of driving. Based on the viscoelastic characteristics of CA mortar, in the dynamic analysis of CRTS Ⅰ slab track, by calling the viscoelastic parameters of CA mortar at 10 ℃, 20 ℃ and 30 ℃, the influence law of different block falling length of CA mortar layer on the deformation of ballastless track structure was analyzed. Research indicates, the increase of block falling length in the middle of CA mortar layer leads that the vertical displacement peak of track plate increases, the vertical displacement peak of base plate decreases, and the relative displacement between track plate and base plate increases;when the viscoelastic parameters of CA mortar at different temperatures are called, with the increase of temperature, the vertical displacement peak of track plate increases, the vertical displacement peak of base plate decreases, and the relative displacement between track plate and base plate increases;however, in the temperature range of 10 ℃~ 30 ℃, the viscoelastic change of CA mortar has no significant effect on the deformation of track structure under the short-term action of dynamic load;the damage of block falling is serious, so early prevention should be carried out, strict monitoring should be carried out during operation, and timely repair should be carried out after discovery.