Graded broken stone base plastic deformation prediction model and prediction method

Abstract

The invention discloses a graded broken stone base plastic deformation prediction model and prediction method. When the prediction model is built, aggregate grading, a water-bearing condition and a stress level of a graded broken stone are considered; and model parameters include the thickness of a graded broken stone base, a vertical pressure stress level of the graded broken stone base and an equivalent axle on the graded broken stone base. According to the prediction method, a plastic deformation amount of the graded broken stone base is calculated by a layerwise summation method accordingto a vertical pressure stress on the graded broken stone base and the equivalent axle on the graded broken stone base; the plastic deformation amounts of the graded broken stone base of a bituminous pavement under the action of different equivalent axles can be accurately predicted or the bearable equivalent axle under a certain plastic deformation amount is determined; a basis can be provided forpavement structure design; and graded broken stone material design is guided. The prediction method can predict the plastic deformation amount of the graded broken stone base more reasonably, conveniently and accurately.

Description

technical field [0001] The invention belongs to the field of highway engineering, and in particular relates to a plastic deformation prediction model and a prediction method of a graded crushed stone base. Background technique [0002] Graded macadam has been used in high-grade highways. The graded macadam base placed between the semi-rigid base and asphalt pavement can effectively suppress the reflection cracks of the asphalt pavement caused by the shrinkage cracks of the semi-rigid base. However, the damage of the graded macadam base is mainly caused by its own excessive plastic deformation, and the plastic deformation of the graded macadam base will also accumulate in the asphalt pavement structure, causing it to form excessive rutting deformation, which affects the Application of graded crushed stone base in high-grade highways. At present, there is no effective and accurate method to determine the plastic deformation of the graded crushed stone base, so it is practical...

AI Technical Summary

Problems solved by technology

However, the failure of the graded macadam base is mainly caused by its own excessive plastic deformation, and the plastic deformation of the graded macadam base will also accumulate in the asphalt pavement structure, causing it to form excessive rutting deformation, which affects the Application of Graded Gravel Base in High-grade Highway

At present, there is no effective and accurate method to determine the plastic deformation of the graded crushed stone base, so it is practically necessary and important to propose a reasonable plastic deformation prediction method for the graded crushed stone base, which can be used to guide the The material design of the mixed gravel base and the structural design of the graded gravel base asphalt pavement also contribute to the development of the maintenance plan of the graded gravel base asphalt pavement

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