上海轨道交通11号线花桥段基础沉降对轨道结构影响研究

Influence of Foundation Settlement on Track Structure in Huaqiao Section on Shanghai Metro Line 11

基于上海市轨道交通11号线花桥段不同结构形式的高架桥梁,分析桥墩沉降与轨道结构内力及轨道线路变化相互映射关系。运用数值模拟软件ABAQUS,针对不同结构形式的高架桥梁建立相应的轨道-桥梁耦合模型,将施工期结束后桥墩的竖直沉降作为外部边界条件施加到轨道-桥梁耦合模型上,分析轨道结构内力及轨道线路变化情况。模型主要模拟静力状态下高架桥梁整体结构的沉降对轨道结构的影响,即桥梁在重力作用下的沉降对轨道结构的影响。监测结果和数值计算结果表明,上海轨道交通11号线花桥段基础沉降对轨道结构的影响均满足设计规范限值要求,在此轨道结构下行车是安全的。

According to different viaduct structural forms in Huaqiao Section on Shanghai metro Line 11,the inter-mapping relationship among pier settlement,internal force of track structure and track line variation is analyzed.Targeting at viaduct with different structural forms,a corresponding track-bridge coupling model is established by adopting the numerical simulation software ABAQUS.The vertical settlement of piers after the completion of construction is enforced to the track-bridge coupling model as an external boundary condition,in order to analyze the internal force of track structure and the variation of track lines.The model is mainly used to simulate the influence of viaduct overall structure settlement on the track structure under static state,that is the influence of viaduct settlement on track structure under gravity.The monitored results and calculation data show that the influence of foundation settlement on the track structure of Shanghai Metro Line 11 Huaqiao Section meets the design code threshold requirements,therefore the train operation is safe under the analyzed track structure.