新建路基小角度斜穿对既有高铁桥梁的影响研究

为研究新建铁路路基小角度斜穿对既有高铁桥梁的影响，以沪通铁路黄封上行联络线斜穿京沪高铁工程为实例，运用ABAQUS软件建立三维有限元数值模型，分析研究不同路基加固方案对京沪高铁桥墩和桩基础的影响。结果表明:小角度斜穿条件下，既有高铁桥墩横桥向水平变形受新建路基影响最为显著；不同加固方案对京沪高铁桥墩和桩基础的影响程度从大到小依次为天然地基、浅层加固、CFG桩加固、钻孔桩+筏板加固；CFG桩与钻孔桩+筏板加固方案可以有效将上部荷载效应传递至处理深度以下，避免引起既有桩基倾斜。

Study on the Influence of New Railway Subgrade Obliquely Crossing Existing High-speed Railway Bridge at a Small Angle

In order to study the influence of new railway subgrade obliquely crossing the high-speed railway bridge at a small angle, taking Huangfeng uplink line of Shanghai—Nantong railway obliquely crossing Beijing—Shanghai high-speed railway as an example, a three-dimensional finite element numerical model was established by using ABAQUS software to study the influence of different subgrade reinforcement schemes on the bridge pier and pile of Beijing-Shanghai high-speed railway. The results show that: The horizontal deformation of high speed railway pier in the transverse direction is most significantly affected by the new railway subgrade when they crossed at a small angle. The influence degree of different schemes in a descending order are natural foundation, shallow reinforcement, CFG pile reinforcement, pile &raft reinforcement. CFG pile and pile & raft reinforcement schemes can effectively transfer the upper load effect to the treatment depth, which avoid the inclination of piles of high-speed railway.