无砟轨道非连续变形植筋关键参数影响分析  

Analysis of the Influence of Key Parameters on Discontinuous Deformation Implantation of Ballastless Track Slabs

作　　者：朱云浩 Zhu Yunhao(College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]浙江大学建筑工程学院,杭州310058

出　　处：《科技通报》2024年第3期115-122,共8页Bulletin of Science and Technology

摘　　要：CRTSⅡ型板式无砟轨道在夏季高温作用时,轨道板板端会产生非连续变形,从而破坏轨道的平顺性进而影响列车安全。针对无砟轨道板端非连续变形问题,本文采用数值计算的方法,建立CRTSⅡ型板式无砟轨道非线性有限元模型,分别计算板端植入1根钢筋和2根钢筋方案下轨道的受力特性;最后分析植筋粘结强度和界面粘结强度对轨道的联合作用。数值计算结果表明:板端植入1根钢筋,抑制轨道位移效果随纵向植入距离增加而减弱,当距板端150 mm时便失去对轨道垂向位移抑制效果;板端植入2根钢筋可以有效抑制轨道垂向位移,效果优于板端植入一根钢筋,但随植筋间距增加植筋应力增大,安全储备减小;植筋粘结强度和层间界面粘结强度的增强对抑制轨道垂向位移均有显著效果。When CRTSⅡballastless slab track is exposed to high temperature in summer,discontinuous deformation will occur at the end of the track slab,which will damage the track smoothness and thus affect the train safety.To ad-dress the problem of discontinuous deformation at the end of the slab,a non-linear finite element model of CRTSⅡslab track was established by numerical calculation,and the force characteristics of the track were calculated for each scenario of implanting one and two steel bars at the slab end.Finally,the combined effect of reinforcement bond strength and interfacial bond strength on the track was analysed.Numerical calculation results show that:The effect of the implantation of a reinforcement at the end of the slab decreases with the increase of the longitudinal implantation distance and loses its effect on the vertical displacement of the track when it is 150 mm from the end of the slab;The implantation of two reinforcement bars at the end of the slab can effectively suppress the vertical displacement of the track,which is better than the implantation of one reinforcement bar,but with the increase of the implantation spac-ing the implantation stress increases and the safety reserve decreases;The enhancement of reinforcement bond strength and interfacial bond strength has a significant effect on the suppression of track vertical displacement.

关 键 词：无砟轨道 植筋锚固 有限元模型 数值分析 粘结强度 

分 类 号：U213.2[交通运输工程—道路与铁道工程]