Evaluation method of plastic deformation performance of graded crushed stone based on pdi index

Abstract

An evaluation method for the plastic deformation performance of graded crushed stone based on the PDI index. The evaluation model takes the plastic deformation index PDI as the evaluation index, and comprehensively considers the plastic deformation of the graded crushed stone specimen at multiple moments in the plastic deformation test, reflecting The development trend of plastic deformation of graded crushed stone under load is obtained, and the plastic deformation performance of graded crushed stone can be accurately evaluated. The evaluation method uses a wheel mill to compact the graded gravel mixture in the test mold to form a graded gravel specimen, and then put the graded gravel specimen together with the test mold on the test bench for plastic deformation tests. The PDI size is calculated by using the plastic deformation performance evaluation model of graded crushed stone based on the PDI index. The smaller the PDI, the better the plastic deformation performance. The test process of the invention is easy to operate, convenient to collect data and simple to calculate, and can make an objective and reasonable evaluation on the plastic deformation performance of the graded gravel.

Description

technical field [0001] The invention belongs to the field of highway engineering, and specifically relates to a method for evaluating the plastic deformation performance of graded crushed stone based on a PDI index, which makes up for the shortage of single performance evaluation index of graded crushed stone and improves the performance evaluation system of graded crushed stone. 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 g...

AI Technical Summary

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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