基于WJ-12型扣件的双块式无砟轨道结构优化设计  

Structural Optimization Design of Double Block Ballastless Track Based on WJ-12 fastener

作　　者：谢露 XIE Lu(China Railway First Survey and Design Institute Group Co.,Ltd.,Xi'an 710043,China;Shaanxi Railway and Underground Traffic Engineering Key Laboratory(FSDI),Xi'an 710043,China)

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710043 [2]陕西省铁道及地下交通工程重点实验室(中铁一院),西安710043

出　　处：《铁道标准设计》2023年第1期110-114,138,共6页Railway Standard Design

基　　金：中国铁路总公司科技研究开发计划-系统性重大项目(P2018G047)。

摘　　要：既有双块式无砟轨道结构在以货为主的客货共线铁路上存在扣件、轨枕安全储备不足、道床开裂严重等问题,尚未推广应用。针对上述问题,对采用WJ-12型扣件、配套无挡肩双块式轨枕的无砟轨道进行结构优化,并将隧道地段基础不均匀沉降作为偶然荷载纳入作用效应组合,基于数值模拟和极限状态法对道床板配筋进行重新设计。结果表明:为便于养护维修、增强轨道绝缘性能,满足钢筋保护层厚度,隧道地段轨道结构高度建议调整为545 mm;为减少施工流程,提高无砟轨道施工及运营质量,建议双块式轨枕取消穿筋孔设置;与高速铁路双块式无砟轨道通用参考图对比,建议客货共线双块式无砟轨道距隧道洞口小于200 m范围加强横向配筋,大于200 m范围加强纵向配筋。Due to some problems, such as insufficient safety reserves of fasteners and sleepers, serious cracking of track bed, the existing double block ballastless track structure has not been applied extensively on the mixed passenger and freight railway dominated by freight. In view of such problems, the structure of ballastless track with the WJ-12 fasteners and double block sleepers without shoulder is optimized, the uneven settlement of foundation in tunnel section is included as an accidental load in the action effect combination, and the reinforcement of track bed plate is redesigned based on the numerical simulation and limit state method. The results show that: in order to facilitate maintenance, enhance track insulation and meet the thickness of reinforcement protective layer, it is recommended to adjust the height of track structure in tunnel section to 545 mm;to reduce the construction process and improve the construction and operation quality of ballastless track, it is recommended to cancel the setting of reinforcement holes in the double block sleepers;compared with the general reference drawing of double block ballastless track of the high-speed railway, it is suggested to strengthen the transverse reinforcement within 200 m from the tunnel portal and to strengthen the longitudinal reinforcement over 200 m away from the tunnel portal of the double block ballastless track of the mixed passenger and freight railway.

关 键 词：客货共线铁路 双块式无砟轨道 WJ-12型扣件 无挡肩双块式轨枕 极限状态法 基础不均匀沉降 

分 类 号：U213.244[交通运输工程—道路与铁道工程] U459.1[建筑科学—桥梁与隧道工程]