CAJ | 학술논문

本文通过用实体单元、接触单元、仅受压的杆单元、非线性弹簧单元分别模拟轨道结构、层间约束关系、桥梁对轨道的支撑及扣压型侧向挡块对轨道结构的约束，建立高速铁路简支梁桥上纵连板式无砟轨道稳定性分析模型。通过理论计算验证模型的正确性，在此基础上，比较层间约束、砂浆层切面刚度以及扣压型侧向挡块设置方式对桥上纵连板式无砟轨道稳定性的影响。研究表明：传统稳定性检算方法的基本假定与实际不符，计算结果偏于不安全；轨道结构稳定性分析需考虑实际层间非线性约束，层间约束越弱，轨道结构稳定性越差；未布置扣压型侧向挡块时，纵连板式无砟轨道结构整体温升18.9℃即失稳；轨道结构最大容许温升为30℃时，扣压型侧向挡块的间距不宜大于18.3 m ；提高砂浆层施工质量、减小挡块间距可有效提高轨道结构稳定性。
본문통과용실체단원、접촉단원、부수압적간단원、비선성탄황단원분별모의궤도결구、층간약속관계、교량대궤도적지탱급구압형측향당괴대궤도결구적약속，건립고속철로간지량교상종련판식무사궤도은정성분석모형。통과이론계산험증모형적정학성，재차기출상，비교층간약속、사장층절면강도이급구압형측향당괴설치방식대교상종련판식무사궤도은정성적영향。연구표명：전통은정성검산방법적기본가정여실제불부，계산결과편우불안전；궤도결구은정성분석수고필실제층간비선성약속，층간약속월약，궤도결구은정성월차；미포치구압형측향당괴시，종련판식무사궤도결구정체온승18.9℃즉실은；궤도결구최대용허온승위30℃시，구압형측향당괴적간거불의대우18.3 m ；제고사장층시공질량、감소당괴간거가유효제고궤도결구은정성。
A finite element analysis model was established on the stability of longitudinally connected ballastless slab track on simply‐supported beam bridges of high speed railway .In this model ,solid finite elements were used to simulate track structure ;contact elements were applied to simulate the contact constraint relationship between adjacent layers ;compression bar elements were used to simulate the support of bridges to the track ;nonlinear spring elements were applied to simulate the constraint of pigeonhole type lateral chock blocks on track structure .The correctness of the model was verified through theoretical calculation .On the basis of this , constraints between layers ,section stiffness of mortar layer and the layout of pigeonhole type lateral chock blocks on the stability of longitudinal connected ballastless slab track were compared .The research showed that the basic assumptions of traditional stability calculating methods did not match the practical conditions ,and the caculating results tended to be unsafe .The nonlinear constraint relations between layers must be calculated during the stability analysis of the track structure .The weaker the constraint between the layers was ,the worse the stability of the track structure .The track structure lost its stability when the temperature of the lon‐gitudinally connected ballastless slab track rose to 18 .9 ℃ if pigeonhole type lateral blocks were not installed . The spacing between adjacent blocks should not be more than 18 .3m when the maximum permissible tempera‐ture of track structure was 30 ℃ .The stability of track structure can be effectively improved by improving the quality of mortar layers and reducing the spacing between adjacent blocks .