FLAC3D simulation-based subgrade settlement prediction method

Abstract

The invention discloses an FLAC3D simulation-based subgrade settlement prediction method. The method comprises the following steps of: firstly establishing a space coordinate system, taking an intersection point of the foundation surface and a symmetry axis of a model as a coordinate origin, taking a direction which is horizontally rightward as an x direction, taking a direction which is vertical to the plane as a y direction, and taking a direction which is vertically upward as a z direction; respectively establishing meshes for each area by utilizing a brick unit according to a control point, grouping and assigning the meshes, and only setting one unit in the y direction, wherein the unit size is 3m; before the subgrade construction, assigning a subgrade mesh part as an empty model, assigning a foundation mesh part as a Mohr-Coulomb model, and carrying out solution by utilizing a graded elastic-plastic theory method; and dividing 5 units in the height direction of the foundation and respectively loading the 5 units. According to the method, an FLAC3D mixed discrete method is adopted to simulate the plastic failure and plastic flow of rock and earth masses, so that the operation is more correct and reasonable, and the numerical analysis does not have any obstacle when instable processes are simulated.

Description

technical field [0001] The invention relates to the field of roadbed settlement prediction, in particular to a roadbed settlement prediction method based on FLAC3D simulation. Background technique [0002] High-speed railway is an important symbol of modernization construction. In order to realize the comfort and safety of operation, high-speed railway has strict requirements on the high ride comfort of the line. As the foundation of the track structure, the roadbed must have high strength and rigidity, good stability and durability. Therefore, the concept of high-speed railway embankment design has also changed. In the past, the design was mainly to control the strength, but now it is required to control the design by deformation. Because in most cases, before the strength reaches failure, there may have been a large deformation exceeding the allowable value. Therefore, it is particularly important to be able to effectively predict the post-construction settlement of the ...

AI Technical Summary

Problems solved by technology

However, the settlement of railway subgrade is a complex three-dimensional process, and there are many factors that affect the prediction results, which brings great difficulties to the settlement prediction.

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