摘要
为提高无砟轨道对下部基础变形的适应能力,以隧道内双块式无砟轨道结构为研究对象,提出高承轨台轨枕结构方案,采用打磨轨枕承轨台的方法降低轨道结构高度,以适应隧道底部的上拱变形。并基于有限元分析方法,建立隧道内高承轨台双块式无砟轨道有限元模型,探讨轨道结构的合理调整量以及静力学性能。结果表明:采用高承轨台双块式轨枕,可实现90 mm的结构最大下调量;在0~90 mm下调范围内,轨枕露出与埋深高度匹配合理,轨枕承轨台、挡肩力学指标满足相关规范要求,螺杆、预埋套管抗拉性能良好,扣件系统具有足够的抗拔承载力;高承轨台双块式轨枕承轨台打磨工艺流程能够指导、实现轨道结构高程的快速调整,为处理实际工程中轨道上拱病害提供了可靠的技术和设备支持,具有较好的工程价值。
In order to improve the adaptability of the ballastless track to the deformation of the underlying foundation,the paper takes the double-block ballastless track structure in the tunnel as the research object,and proposes the sleeper structure of the high-bearing platform.The method of grinding the sleeper rail platform is used to reduce the height of the track structure to adapt to the arching-up deformation at the bottom of the tunnel.Based on finite element analysis method,the finite element analysis model of the double-block ballastless track with high-bearing platform in the tunnel is established to investigate the reasonable adjustment amount and static performance of the track structure.The results show that:The adoption of double-block sleeper with high-bearing platform can realize the maximum downward adjustment of 90 mm;Within the range of 0~90 mm down adjustment,the exposed sleeper height and buried depth are reasonably matched,the mechanical indexes of sleeper rail platform and shoulder meet the requirements of relevant specifications,the screw and embedded casing have good tensile performance,and the fastener system has sufficient pull-out resistance;The polishing process of the double-block sleeper bearing platform of the high-bearing platform can guide and fulfill rapid adjustment of track structure elevation,provide reliable technical and equipment support for the treatment of track arching-up deformation in the actual project with good engineering values.
作者
杨宇栓
杨荣山
黄嘉奇
李莹
苏乾坤
曹世豪
YANG Yushuan;YANG Rongshan;HUANG Jiaqi;LI Ying;SU Qiankun;CAO Shihao(MOE key Laboratory of High-speed Railway Engineering,Southwest Jiaotong University,Chengdu 610031,China;China Railway Eryuan Engineering Croup Co.,Ltd.,Chengdu 610031,China;College of Civil Engineering,Henan University of Technology,Zhengzhou 450001,China)
出处
《铁道标准设计》
北大核心
2022年第4期68-73,共6页
Railway Standard Design
基金
国家自然科学基金项目(51978584,51778543)
国家自然科学基金青年项目(51908197)
河南省科技攻关项目(202102310262)
中铁二院工程集团有限责任公司科研项目(2019H0576)。
关键词
高速铁路
基础变形
高承轨台双块式无砟轨道
打磨承轨台
结构应力
有限元
high-speed railway
foundation deformation
double-block ballastless track with high-bearing platform
sleeper bearing platform grinding
structural stress
finite element
