Method for testing grading broken stone CBR numerical value

A graded crushed stone and numerical test technology, applied in the direction of testing material hardness, etc., can solve the problems of high cost, difficulty in measuring internal material migration and stress-strain characteristics, and long design period of graded crushed stone materials, etc., to achieve Optimize composition, accurately predict effect

Inactive Publication Date: 2011-11-02
CHANGAN UNIV
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Problems solved by technology

[0003] The applicant analyzed the above-mentioned graded crushed stone CBR indoor test method, and there are the following defects: (1) Only by repeatedly carrying out a large number of CBR indoor tests can it be possible to reveal the relationship between aggregate, aggregate gradation and graded crushed stone CBR. law, and to achieve the optimal design of graded crushed stone materials, which results in a long design cycle and high cost of graded crushed stone materials; (2) it is difficult to measure the internal material migration and stress-strain characteristics of graded crushed stones under load

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  • Method for testing grading broken stone CBR numerical value
  • Method for testing grading broken stone CBR numerical value
  • Method for testing grading broken stone CBR numerical value

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Embodiment Construction

[0066] According to the technical solution of the present invention, this embodiment provides a CBR numerical test method for graded crushed stone, taking Ankang Yinghu limestone crushed stone as an example, the crushed stone density test results are shown in Table 1, and the micromechanical parameters are shown in Table 2.

[0067] Table 1 crushed stone density

[0068] Aggregate particle size (mm)

19～31.5

9.5～19

4.75～9.5

≤4.75

Apparent density (g / cm 3 )

2.712

2.709

2.692

2.681

[0069] Table 2 Micromechanical parameters

[0070] Poisson's ratio

Shear modulus (GPa)

coefficient of friction

0.25

8.0

0.35

[0071] Table 3 Mineral Material Grading

[0072]

[0073] Taking the gradation A in Table 3 as an example, the implementation steps of the CBR numerical test method for graded crushed stone are as follows:

[0074] 1) Construction of physical model

[00...

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Abstract

The invention discloses a method for testing grading broken stone CBR numerical value. According to the invention, a physical model and a mechanical model are established for simulating the grading broken stone CBR test, the method comprises the following steps: testing basic parameters, simulating of a CBR testing model, test pieces, a load plate, a CBR pressure head and the like, endowing the physical model with micro mechanics parameters, simulating a loading process of CBR test, finishing an arrangement of the simulation result to obtain the relational curve of the pressure head penetration rate and the penetration force, and obtaining the penetration force corresponding to a penetration rate of 2.5 mm according to the relational curve of the penetration rate and the penetration force. According to the invention, the grading broken stone CBR value can be rapidly and accurately predicted by the method, and a change rule of grading broken stone stress-strain can be represented.

Description

technical field [0001] The invention belongs to the field of traffic civil engineering, and relates to a CBR numerical test method of graded gravel, and the CBR refers to the California bearing ratio. The present invention is based on PFC 2D The software platform can quickly and accurately predict the CBR law of graded crushed stone, shorten the research cycle, and reduce the cost of graded crushed stone research and material optimization. Background technique [0002] Graded crushed stone is a typical road base material, and the CBR index is usually used to evaluate its strength and design the material composition. The basic principles and steps of the graded crushed stone CBR indoor test method are as follows: (1) prepare the specimen according to the maximum dry density and optimum water content; (3) Carry out the penetration test on the specimen soaked in water; (4) Arrange and calculate the penetration test results to obtain the CBR value. At present, there is no rep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/40
Inventor 蒋应军任皎龙徐寅善李頔李思超刘延金马庆伟
Owner CHANGAN UNIV
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