路基上CRTSⅡ型板式轨道纠偏作业损伤扩展规律

Damage Propagation Laws of Subgrade CRTSⅡSlab Track Under Displacement Correction

摘要:

基于纠偏作业工艺，建立了路基上中国铁路轨道系统(CRTS)Ⅱ型板式轨道有限元模型，研究轨道板宽窄接缝离缝、轨道板砂浆层离缝、支承层裂纹在纠偏作业中的扩展规律.结果表明：宽窄接缝离缝会减弱轨道板宽窄接缝粘结界面抵抗损伤的能力；砂浆层离缝对轨道板砂浆层粘结界面损伤的影响较小；支承层裂纹在纠偏作业过程中会进一步向支承层内部扩展.

关键词:高速铁路; 板式轨道; 纠偏; 损伤扩展

Abstract:

Based on the displacement correcting method, the China railway track system(CRTS)Ⅱslab track was modelled in a finite element software. The damage propagation laws of wide and narrow joint separation, mortar-layer separation and supporting-layer cracks during the correction process are studied. The results show that the wide and narrow joint separation would decrease the ability to resist damage of the bonding interface; the mortar-layer separation made little influence on bonding interface; the supporting-layer cracks would grow deeper into the inside of the supporting-layer during the correction process.

Key words:high-speed railway; slab track; displacement correction; damage propagation