双块式无砟轨道连续道床板裂纹修复材料性能分析

双块式无砟轨道在外界荷载作用下,连续道床板容易开裂形成裂纹,裂纹的产生会降低道床板的耐久性和承载能力,影响双块式无砟轨道在服役期间的使用与安全性。当连续道床板出现裂纹时,应该采取措施来维持双块无砟轨道的正常的使用和耐久度。基于有限单元法,建立含道床板贯通裂纹的双块式无砟轨道梁体模型,分析最不利荷载作用时所适合的修补材料,以期为双块式道床板裂缝维修提供一定的理论基础。研究表明:不同宽度裂纹对维修材料性能要求不同,随着裂纹宽度的增加,材料所受到的拉应力越小,越小宽度的裂缝对材料的延伸率要求越高。

Performance Analysis of Repair Material for Crack Repairing of Continuous Track Slab of Bi-block Ballastless Track

Under the action of external load,the continuous track slab of bi-block ballastless track is likely to crack.The cracking will reduce the durability and carrying capacity of the track slab.Still more,the cracking may also affect the usability and safety of the bi-block ballastless track during service.For this reason,when cracking appears at the continuous track slab,some repairing measures should be adopted to maintain both the normal use and the durability of the bi-block ballastless track.Based on finite element method,this paper established a beam-solid model of bi-block ballastless track which contained some through-cracks at the track slab,and analyzed the most suitable repair materials for the crack repairing under the action of the most unfavorable loads,in the hope of providing theoretical bases for crack repairing of track slab of bi-block ballastless track.The research shows:the requirements on repair material's performance will be different corresponding to the different crack widths.With the increase of the crack width,the tensile stress of the material will decrease.The smaller the crack width is,the higher the elongation percentage requirement of the material becomes.