Parameter Optimization Analysis of Shallow Buried Pile-plank Structure on Deep Silty-fine Sand Foundation of High-speed Railway

In order to control the settlement of high-speed railway subgrade under the condition of deep silty fine sand foundation, this paper studies the influence of different design parameters of shallow buried reinforced concrete pile-board structure on the settlement and deformation of ballastless track with the help of FLAC
^3D
software, analyzes the sensitivity of factors, designs multiple sets of models combining different pile length, pile diameter, plank thickness and longitudinal span, compares and analyzes the post-construction settlement, pile and soil settlement and stress analysis, plank stress deformation, so as to obtain the most suitable pile-board structure parameters for deep silty fine sand soft soil foundation. The results show that the sensitivity of pile length and pile diameter to post-construction settlement is greater than that of plank thickness and longitudinal span, showing a linear increasing trend, and the influence of plank thickness and longitudinal span is not obvious. As the pile length increases, the maximum vertical stress of the pile body also increases and the depth continues to move down. The plank is too thick to make the pile bear greater load.