摘要
为探究高速铁路基础变形诱发无砟轨道-桥梁系统关键构件变形累积与刚度突变的轨面解析表征模式,针对高速铁路桥上双块式、单元板式、纵连板式无砟轨道结构特点,基于Castigliano第二定理和线性叠加原理,分别推导考虑关键构件刚度突变、限位构件参与度影响的三种无砟轨道结构轨面变形与基础变形间解析表征模型,通过试验、仿真和实测结果对其进行验证,并基于该模型分析桥梁变形、关键构件刚度突变及限位构件参与度等对无砟轨道-桥梁系统层间变形传递与联结接触的影响规律。研究表明:提出的模型与试验结果、仿真结果、轨检车实测数据吻合良好,验证该模型的正确性;三种无砟轨道在自重下均随桥梁发生“跟随性”变形,单元板对桥梁变形适应能力较强,纵连板抵御桥梁变形能力较强,但易形成大范围板底脱空,给行车带来安全隐患;桥墩沉降下,关键构件刚度突变只对突变区域内轨面变形有影响,扣件断条致纵连板轨面变形最大,单元板次之,双块式最小,砂浆离缝致纵连板在“下陷”区域轨面变形比单元板平缓,砂浆脱空致单元板“下陷”幅度小于纵连板;侧向挡块和剪切钢筋的参与对轨面变形贡献较小,而剪力齿槽的参与对轨面变形影响较大。
In order to explore the rail surface analytical representation model of deformation accumulation and stiffness mutation of key components in ballastless track-bridge system induced by earthworks deformation of high-speed railway, according to the structural characteristics of double block, unit slab and longitudinally connected slab ballastless track on high-speed railway bridge, the analytical representation model of rail surface deformation and earthworks deformation of three ballastless track structures considering the stiffness mutation of key components and the influence of the participation of limit components was derived, respectively, based on Castigliano’s second theorem and linear superposition principle.Furthermore, the test, simulation and measured results verified the representation model, and the influences of bridge deformation, stiffness mutation of key components and participation of limit components on the interlayer deformation transfer and connection contact of ballastless track-bridge system were analyzed based on the model.The results show that the results from the proposed model are in good agreement with the test results, simulation results and measured data of rail inspection vehicle, verifying the correctness of the proposed model.Three kinds of ballastless track have ‘following’ deformation with the bridge under their self-weights, the unit slab has strong adaptability to bridge deformation, and the longitudinally connected slab has strong ability to resist bridge deformation, but it is easy to produce a large range of slab bottom detachment, which brings safety hazards to operational safety of train.Under the pier settlement, the stiffness mutation of key components only affects the rail surface deformation in the mutation area, the rail surface deformation of the longitudinally connected slab shall be in the decreasing sequence caused by the breaking of fastener, by the unit slab, and by the double block, the rail surface deformation of the longitudinally connected slab is gentl
作者
冯玉林
侯宇
蒋丽忠
陈梦成
冯青松
周旺保
Feng Yulin;Hou Yu;Jiang Lizhong;Chen Mengcheng;Feng Qingsong;Zhou Wangbao(East China Jiaotong University,Nanchang 330013,China;State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure,Nanchang 330013,China;Central South University,Changsha 410075,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2023年第3期44-57,共14页
China Civil Engineering Journal
基金
国家自然科学基金(51778630,52078487)
国家自然科学基金高铁联合基金(U1934207)
中南大学创新驱动项目(502501006)
江西省教育厅科学技术研究项目(GJJ200657)
轨道交通基础设施性能监测与保障国家重点实验室自主课题(HJGZ20212009)。
关键词
高速铁路
表征模式
刚度突变
限位构件
变形累积
high-speed railway
representational mode
stiffness mutation
limit components
deformation accumulation
