Large Deformation Settlement Series Solution and Numerical Simulation for Underpass Project Track

Abstract

The settlement of track in a railroad underpass project was studied by theoretical analysis and numerical simulation, based on the model of winkle beam on elastic foundation. Taking the settlement of roadbed as a nonlinear boundary condition, the control differential equation of the track large deformation settlement was established and solved by the Fourier series method; the numerical solution was obtained by establishing a numerical model based on an actual project and compared and analyzed with the series solution and cosine function solution. The correlation coefficients of the track settlement curves obtained from the series solution and the numerical solution were higher than those of the cosine function solution while the numerical solution with the maximum track settlement difference was only 0.8% of the maximum settlement of the track numerical solution. The accuracy of the series solution method is higher in this paper, and the track settlement curve obtained from theoretical calculation reflects and predicts the track settlement well when the track settlement cannot be measured directly.