Analysis of the Stress and the Deformation Characteristics of the Initial Support of the Large Section deeply buried in the sandy loess tunnel

To explore the stress and deformation characteristics of a large section that deeply buried in the sandy loess tunnel structure, numerical simulation and field test analysis were carried out and the initial support structure of sandy loess tunnel was studied based on the Panxian Mountain Tunnel Project in Zhonglankezhuan. With field sand loess physical parameter and mechanical properties, a series of numerical simulation of complex was calculated, the scene actual situation was highly restored, and the steel arch bending moment, axial force and the tunnel vault settlement were calculated. Then, the stress characteristics of the initial support of the tunnel are analyzed by using the time-varying curve and the distribution nephogram in the final state. At the same time, according to the field monitoring steel arch strain, its stress characteristics were analyzed. The stress was then converted into internal force from material mechanics that verify the reliability of the numerical simulation results. The research can provide some help for the subsequent researches and construction of sandy loess tunnel, with a certain reference significance.