盾构下穿引起的既有线路轨道变形与列车运营作用研究

地铁盾构下穿既有高铁线路施工时会对既有地基产生扰动,引起地层不同程度的沉降、路基下沉、轨道结构变形等病害,不仅对隧道和周边环境的安全产生不利影响,严重的会造成既有铁路破坏,影响线路的正常运营,给乘客带来安全隐患。利用有限元软件ABAQUS建立了轨道-路基-下穿隧道有限元模型分析了盾构施工对既有线路轨道结构的影响,并结合高速铁路结构间的相互作用关系,基于车辆-轨道耦合动力学理论对盾构下穿引起的线路变形、轨道结构层间离缝与列车运行相互作用进行了分析。

Research on Existed Track Deformation Induced by Down-traversing Shield Tunnel and Interactive Influence on High-speed Train

The down-traversing shield tunnel excavation is likely to disturb the existed railway foundation and result certain deformation of ground layer,settlement of subgrade and track irregularity,which may impact surrounding environment,affect normal operation and endanger the passengers,and what is more,damage the railway. In this paper,a track-subgrade-down-traversing shield tunnel model is established with finite element software ABAQUS to analyze the influence of down-traversing shield tunnel. The interactional relation between the deformation of track, the track layer joints and the operation of high-speed train caused by underpass tunneling is analyzed in view of the interaction between high speed railway structures based on vehicle track coupling dynamics theory.