新建铁路下穿对运营高铁桥梁变形影响研究  

Study on the Influence of the Newly-Built Railway on High-speed Railway Bridge Deformation

作　　者：解建超 Xie Jianchao(China Railway Design Corporation,Tianjin 300308,China)

机构地区：[1]中国铁路设计集团有限公司,天津300308

出　　处：《铁道勘察》2021年第3期51-55,60,共6页Railway Investigation and Surveying

摘　　要：为研究深厚松软土地区新建铁路下穿对运营高铁桥梁的影响,结合汊周联络线铁路下穿津保高铁桥梁工程,通过ABAQUS数值模拟软件建立三维分析模型,对比研究在不同桩基设计长度下,采用普通路基填料与轻质混凝土填筑路基U形槽沉降规律与桥墩纵横向变形及沉降规律,并与规范限值进行对比。结果表明,新建铁路下穿高铁桥墩时,桥墩的顺桥向位移和横向位移较易满足规范限制要求,而竖向差异沉降为主要控制因素,下穿工程应在两桥墩中心穿越,以减小不均匀沉降造成的线路折角;通过加大地基处理深度可使桥墩附加沉降减小约40%;采用轻质混凝土填料可使桥墩的附加沉降减小38%~41%。In order to study the influence of newly built railway on the existing high-speed railway in the area of deep and soft soil,this paper analyzed a project of Chagugang-Zhoulizhuang connection railway under crossing the bridge of Tianjin-Baoding high-speed railway.By building 3D analysis model by ABAQUS software,the settlement law and deformation law of U-shaped groove were analyzed.Models filled with ordinary subgrade filling and lightweight concrete under the different length of pile foundation were built,and the results were compared with specifications.The result shows that,when the bridge of operating high-speed railway is crossed by a newly built railway,longitudinal stress and transversal stress of the bridge can meet the limit values in standards.However,vertical differential settlement is the mainly control factor.The high-speed railway bridge should be crossed in the center of two piers to reduce the line angle which is caused by differential settlement.Extending foundation depth can reduce the additional settlement of bridge pier by 40%.Applying lightweight concrete can reduce the additional settlement of bridge pier by 38%~41%.

关 键 词：U形槽 下穿高铁 附加沉降 水平位移 ABAQUS 轻质混凝土 深厚松软土 

分 类 号：U213.15[交通运输工程—道路与铁道工程] TU753[建筑科学—建筑技术科学]