A three-dimensional finite element verification method for structural stability analysis of multi-storey railway subgrade

Abstract

The invention discloses a three-dimensional finite element verification method for the stability analysis of multi-layer railway subgrade structure. The method uses ABAQUS finite element software to apply a dynamic cyclic load equal to the stability limit of multi-layer railway subgrade structure calculated by stability theory on the track surface , by analyzing the relationship between the residual stress field of the structure and the number of load cycles, it is verified whether the railway structure is in a stable state under the load. The specific steps include: simplifying the subgrade structure of railway pavement; extracting the geometric parameters of the structure; assigning material properties and unit properties to the subgrade structure of the pavement respectively; setting the boundary conditions of the structure; The present invention simplifies the actual structure of the railway pavement subgrade, establishes a three-dimensional finite element model of the multi-layer railway pavement subgrade structure, and verifies the stability limit of the multi-layer railway pavement subgrade structure obtained by the stability theory, which can be used for the construction of the railway pavement subgrade Design provides useful reference.

Description

technical field [0001] The invention relates to the technical field of computer-aided design of railway engineering, in particular to a three-dimensional finite element verification method for stability analysis of multi-layer railway subgrade structure. Background technique [0002] Railway has the characteristics of fast speed and large transportation volume, so the proportion of railway transportation in modern transportation is getting higher and higher. At present, most of the analysis methods and design theories of railway pavement are based on elasticity theory and empirical methods. In fact, under the action of vehicle loads, the pavement structure mainly exhibits plastic deformation. This makes the strength and deformation characteristics of railway pavement materials based on elastic theory not be reflected correctly. Therefore, it is an important direction of railway research to analyze and consider the deformation and failure characteristics of railways under m...

AI Technical Summary

Problems solved by technology

However, due to the complexity of calculating the self-balancing residual stress field of pavement structures under the action of movement, structural materials are usually simplified in theoretical analysis, such as ideal elastic-plastic materials, small deformation theory, and time-related factors ( Such as speed sensitivity, creep, etc.), so the stability limit load obtained by theoretical calculation may not be able to make the structure in a stable state, and thus plays a restrictive role in applying the stability analysis theory to the analysis and design of railway pavement structures

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