底座厚度偏差对双块式无砟轨道力学性能的影响研究  

Study on the Influence of Base Thickness Deviation on Bi-Block Ballastless Track Mechanical Properties

作　　者：王聚光 WANG Juguang(China Railway Design Corporation,Tianjin 300308,China)

机构地区：[1]中国铁路设计集团有限公司,天津300308

出　　处：《铁道建筑技术》2024年第11期78-82,113,共6页Railway Construction Technology

基　　金：中国铁路设计集团有限公司科技开发课题(2022A02238003,2023A0223804)。

摘　　要：底座厚度偏差是高速铁路双块式无砟轨道施工过程中常见缺陷,影响底座配筋及力学性能。为解决厚度偏差的不利影响,基于有限元理论建立了桥梁地段双块式无砟轨道“梁-板-板”力学分析模型,计算分析了厚度偏差对底座力学性能及配筋的影响,并给出了厚度偏差整治措施建议。主要研究结论及建议如下:荷载作用下,底座弯矩均随厚度增加逐渐增大;相同配筋情况下,随厚度增加,配筋率逐渐减小,混凝土裂缝宽度、钢筋应力、混凝土纵向应力逐渐增大,底座耐久性逐渐变差;建议施工时严格控制测量、施工质量,对厚度偏差区段底座采取加强配筋措施,不满足安全性、耐久性要求的底座采取拆除重筑措施。Base thickness deviation is a common defect in the construction of high-speed railway bi-block ballastless track,which affects the mechanical properties and reinforcement of track base.In order to solve the adverse impact of thickness deviation on track base,the“beam-slab-slab”mechanical analysis model of bi-block ballastless track on bridge was established based on the finite element theory,the influence of thickness deviation on the mechanical properties and track base reinforcement were calculated and analyzed.And also some suggestions on how to rectify the thickness deviation were put forward.The main conclusions and suggestions are as follows:the bending moment of track base under load increases gradually with the increase of base thickness;under the same condition of base reinforcement,with the increase of track base thickness,the reinforcement rate decreases gradually,the concrete crack width,reinforcement stress and concrete longitudinal stress increase gradually,and the durability of track base gradually deteriorates;it is suggested that the measurement and construction quality should be strictly controlled,reinforcement-strengthed measures should be adopted for the base on thickness deviation section,and measures should be taken to dismantle and rebuild the track base that does not meet the safety and durability requirements.

关 键 词：高速铁路 底座配筋 双块式无砟轨道 厚度偏差 

分 类 号：U213.21[交通运输工程—道路与铁道工程]