纵连板式轨道稳定性分析及上拱整治研究  

Stability Analysis and Uplift Treatment Study of Longitudinal Connected Slab Track

作　　者：张向民[1] 刘家良 朱高明[2] 张勇[1] ZHANG Xiangmin;LIU Jialiang;ZHU Gaoming;ZHANG Yong(Central South University,Changsha,Hunan 410075,China;China Railway Group Limited,Beijing 100055,China)

机构地区：[1]中南大学,长沙410075 [2]中国中铁股份有限公司,北京100055

出　　处：《铁道工程学报》2020年第3期21-26,83,共7页Journal of Railway Engineering Society

基　　金：国家自然科学基金项目(51878672)。

摘　　要：研究目的:针对持续高温天气下纵连板式轨道上拱变形问题,本文依据弹性薄板理论构建稳定性分析模型,并根据CA砂浆层间黏结强度的内聚力模型,分弹性损伤、层间脱黏以及离缝上拱三个阶段建立系统总能量方程,运用能量变分原理和瑞利-里兹法,确定纵连板式轨道上拱变形的全过程平衡路径及失稳临界条件。研究结论:(1)在运营损伤工况下轨道板失稳的最不利临界温升为20.53℃;(2)钢轨温度力向上分量对单块轨道板的作用合力达19.866 kN,对轨道板上拱的影响较为显著;(3)窄接缝破损可导致层间脱黏阶段临界温升降低3.91%;(4)CA砂浆黏结强度下降20%可导致层间脱黏阶段失稳临界温升下降17.24%;(5)轨道板纵向阻力由55%降低至10%,最小失稳临界温升可降低32.81%;(6)轨道板厚度增加10 mm,最小失稳临界温升可提高6.03%;(7)该研究成果可为纵连板式轨道及其他既有轨道结构的病害整治措施提供理论参考。Research purposes:In order to solve the uplift deformation problem of longitudinal connected slab track under continuous high temperature weather,the stability analysis model is constructed based on the theory of elastic thin plate.According to the cohesive zone model of the CA mortar layer bond strength,the total energy equation of the system is established in three stages:elastic damage,interlaminar debonding and uplift disease.Through the energy variational principle and the Rayleigh-Ritz method,the whole-process equilibrium path and instability critical conditions of the uplift deformation of longitudinal connected slab track are determined.Research conclusions:(1)The most unfavorable critical temperature rise of track slab instability under the operational damage condition is 20.53℃.(2)The vertical component resultant force of the rail temperature force on the single slab can reach 19.866 kN,which has a significant effect on the uplift disease of the track slab.(3)The failure of narrow joint concrete causes the critical temperature rise in interlaminar debonding stage to decrease by 3.91%.(4)When the bond strength of CA mortar decreases by 20%,the instability critical temperature rise in interlaminar debonding stage decreases by 17.24%.(5)When the longitudinal resistance of the track slab is reduced from 55%to 10%,the minimum instability critical temperature rise is reduced by 32.81%.(6)When the thickness of the track slab is increased by 10 mm,the minimum instability critical temperature rise increases by 6.03%.(7)The research results can provide a theoretical reference for the disease treatment of longitudinal connected slab track and other existing track structures.

关 键 词：纵连板式轨道 竖向稳定性 弹性薄板理论 能量法 上拱病害整治 

分 类 号：U213.244[交通运输工程—道路与铁道工程]