PDI index-based graded crushed stone plastic deformation performance evaluation model and method

Abstract

A PDI index (plastic deformation index)-based graded crushed stone plastic deformation performance evaluation model and method are provided. The evaluation model is characterized in that: the PDI is taken as the evaluation index, the plastic deformation of the graded crushed stone specimen in the plastic deformation test at multiple moments is comprehensively considered, the development trend of plastic deformation of the graded crushed stone under the load is reflected, and graded crushed stone plastic deformation performance can be accurately evaluated. The evaluation method comprises: usinga wheel mill to crush the graded crushed stone mixture in the test mold to form a graded crushed stone test piece; then placing the graded crushed stone test piece and the test mold on the test benchfor plastic deformation testing; and calculating the PDI size by using the PDI index-based graded crushed stone plastic deformation performance evaluation model, wherein the smaller the PDI is, the better the plastic deformation performance will be. According to the model and method provided by the present invention, operations in the test process are easy, data collection is convenient, the calculation is simple, and the graded crushed stone plastic deformation performance can be objectively and reasonably evaluated.

Description

technical field [0001] The invention belongs to the field of highway engineering, and specifically relates to a graded crushed stone plastic deformation performance evaluation model and method based on a PDI index, which makes up for the shortage of a single graded crushed stone performance evaluation index and improves the graded crushed stone performance evaluation system. Background technique [0002] Due to its advantages of easy material acquisition and low cost, graded crushed stone materials were widely used in the early road construction in my country, but due to the limitation of understanding level and technical conditions, graded crushed stone failed to achieve rapid development and application, especially It is still rarely used in high-grade highways, which has a certain relationship with the single performance evaluation index of graded crushed stone. [0003] At present, the California bearing ratio CBR value is mainly used to evaluate the performance of graded...

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Problems solved by technology

[0002] Due to its advantages of easy material acquisition and low cost, graded crushed stone materials were widely used in the early road construction in my country, but due to the limitation of understanding level and technical conditions, graded crushed stone failed to achieve rapid development and application, especially It is rarely used in high-grade highways, which has a certain relationship with the single performance evaluation index of graded crushed stone.

[0003] At present, the California bearing ratio CBR value is mainly used to evaluate the performance of graded crushed stone, but the CBR value represents the ability of graded crushed stone to resist local load indentation and deformation, and reflects the bearing capacity of graded crushed stone, so it is difficult to determine its deformation performance. However, the failure of the graded crushed stone base is mainly caused by excessive plastic deformation.

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