Finite-Element Analysis Of The Influence Of Subgrade Differences In Settlement To Uneven Deformation Of The Subgrade Surface In Embankment

High-speed railway has very strict requirements on the smoothness. In the transition section represented by the difference sedimentation occurred at the high-speed railway, the smoothness has been greatly affected. Related test, the experimental and theoretical results show that the different effects of differential settlement in the form of the subgrade surface smoothness. In this paper, the linear elastic model reduction of linear elastic modulus correction model, as well as non-linear elastic model which Duncan-Chang model this problem was discussed. At the same time, for the existing finite element calculation of the model parameters are inaccurate to discuss the Duncan-Chang model parameters extracted from the experimental data which, as a reference. The main work is as follows:(1)In accordance with the gradual modification to the idea of approaching the actual nature of the soil, respectively, using linear elastic model, modulus reduction amendment linear elastic model and Duncan-Chang model, to the subgrade difference sedimentation in deposition on the subgrade surface is uneven settlement curve characteristics finish the finite element analysis. Reflecting uneven subgrade surface deformation characterization value which contains the uneven impact of L and subgrade surface deformation and slope of the k has been used. The control differential settlement index value containing the impact of length L and differential settlement limits As has been adopted.(2)The staggered desktop differential settlement model as the standard model example, conduct a comprehensive analysis to the correction effect of the Duncan-Chang model. Consistency in the form of uneven subgrade surface deformation curve, the two types of models, but also verified the reduction in modulus correction model law which the embankment height and differences in settlement of the gradient length, will affect the subgrades of differential settlement on the subgrade surface disturbance, that is, uneven subgrade surface deformation.(3)As a subgrade of Yang Yao, our group and others have done the triaxial test data of the coarse particulate filler, follow the steps from the standard method of gradual correction, discuss a simplified processing method according to the standard curve method, vecetic methods and Zhang Qianli simplified processing method. According to the method, extracted Duncan-Chang material parameters for the context of engineering of high-speed railway transition section. And reference to Duncan-Chang model parameters for other projects with soil, provides a basis for the reasonable value.