Abstract: When constructing new structures around existing railways, it is necessary to consider the impact of additional loads on the existing railways. Especially in soft soil areas, the loading on one side of the existing roadbed might cause deformation of the foundation, and appropriate engineering measures are needed to be taken to ensure the safe operation of the existing railway. To study the impact of retaining walls and their backfill soil on the outside of existing railway embankments in soft soil areas, this paper selects a retaining wall and backfill soil project on the side of an existing railway near a park in Shaoxing City as an engineering example. Firstly, the deformation control values of the track and roadbed are determined according to relevant specifications. Then, numerical simulations and theoretical analysis are used to obtain the horizontal and vertical displacements of the existing railway track surface corresponding to different engineering measures under the action of backfill soil loads, the engineering measures are ultimately determined which could ensure the safety of the railway operation. The research results of this article can provide a reference for the design and construction of similar railway related projects.

Key words: Existing Railways, Retaining Walls, Backfills, Foundation Treatment, Numerical Analysis