研究目的:随着铁路开发，在既有铁路侧进行堆载的工程日益增多,对既有铁路结构势必产生一定的变 形影响，因此在既有铁路路基边进行弃土堆填时，需预估堆填工程对既有铁路路基的变形影响，以确保铁路安 全。本文通过分析坡体稳定性、不同堆载高度、不同堆载间距以及堆载分级级数对既有路基变形的影响，以期 减小堆载对既有铁路路基的影响。 研究结论:（1）在堆填土方量一定的前提下，分级堆载比不分级堆载对既有路基的变形影响较小；（2)在 堆填高度一定时,三级堆载比二级堆载对既有路基的变形影响较小，分级荷载不同间距对既有路基的影响不 是线性关系；（3)分级荷载大小相等时，堆载间距是影响既有路基变形的关键因素；（4)该研究成果可为其他 类似高铁侧堆载减小对既有铁路的影响提供参考。

Research purposes： With the railway development, landfill engineering near the existing railway may cause the structure deformation of railway, so while landfill near the existing railway subgrade, we need to forecast the impact of the landfill engineering on the deformation of railway subgrade to ensure the safety of railway , analyze the influence of the slope stability，filling height，different filling spacing and load hierarchical level on the deformation of the existing subgrade. Research conclusions:(1) At specific amount of landfill，the influence of multi - stage loading on railway subgrade is less than single - stage loading. (2) At a certain landfill height，the influence of three - stage loading on existing railway subgrade less than two - stage loading， and the influence of different spacing on subgrade is not linear relationship. (3) Under the equal hierarchical loading size, the filling spacing is the main factor that affects deformation of existing railway subgrade. (4) The research result can provide reference to reduce the influence of other similar filling near high - speed railway on railway.