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Grading gravel CBR numerical experiment method based on three-dimensional state

A three-dimensional state, numerical test technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problem that the interlocking effect and the distribution characteristics of the gap between the crushed stones cannot be considered, and the internal particles of the graded crushed stone cannot be obtained. Micromechanical properties, etc.

Active Publication Date: 2018-07-06
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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AI Technical Summary

Problems solved by technology

[0004] In addition, the above-mentioned graded gravel CBR indoor test method and the existing CBR numerical test method have the following defects: (1) the traditional test method can only obtain the relationship between aggregate and CBR through repeated large numbers of tests; (2) the traditional indoor The test method can only obtain the CBR value of the graded crushed stone, but cannot obtain the microscopic mechanical properties of the internal particles of the graded crushed stone during the test; (3) The existing CBR numerical test method is based on a two-dimensional model. Converted to a disc-shaped unit with a certain thickness, the interlocking effect between the crushed stones and the distribution characteristics of the voids cannot be considered

Method used

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  • Grading gravel CBR numerical experiment method based on three-dimensional state
  • Grading gravel CBR numerical experiment method based on three-dimensional state
  • Grading gravel CBR numerical experiment method based on three-dimensional state

Examples

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Embodiment 1

[0082] Example demonstrates the specific implementation process of the present invention with limestone crushed stone, the basic physical properties of crushed stone are shown in Table 1, and the micromechanical parameters are shown in Table 2.

[0083] Table 1 Optimum moisture content of graded gravel

[0084] Dry density (g / cm3)

2.31

2.334

2.346

2.338

2.334

Average moisture content (%)

3.78

4.41

4.83

5.37

5.84

[0085] Table 2 Micromechanical parameters

[0086]

[0087] Step a: Through the WALL command in PFC3D, respectively establish the bottom surface (circular wall) and side wall (column wall) of the test mold, such as figure 1 As shown, gravel particles are generated according to the actual gradation, and physical properties such as gravel density are endowed. According to the test results and fitting curve, the optimal moisture content of graded gravel is 4.85%, and the maximum dry density is 2.346g / cm 3 . The ...

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Abstract

The invention discloses a grading gravel CBR numerical experiment method based on the three-dimensional state. The method comprises the steps that firstly, a value is assigned to microscopic parameters of a simulation test piece, then, the CBR experiment loading process is simulated, a relation curve of injection force and pressing head injection amount can be obtained, and then, the injection force corresponding to the injection amount being 2.5 mm in the model result can be inverted into a CBR value through a CBR reduction formula. According to the method, the CBR experiment of grading gravels under the three-dimensional state can be truly represented, the defect that a two-dimensional model cannot describe gravel interlocking or spatial distribution is overcome, the grading gravel CBR value can be rapidly and accurately obtained, and the mesomechanics performance change rules of grading gravel particles in the CBR experiment process can be tracked in real time.

Description

technical field [0001] The invention belongs to the technical field of road engineering, in particular to a CBR numerical test method based on graded gravel in a three-dimensional state. Background technique [0002] Graded crushed stone is a typical road base material, and the CBR (California Bearing Ratio) 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 have been applications for CBR numerical two-dimensional test method for graded crushed stone, but there is no report on the three-dimensional numerical test method for graded crushed stone. [0003] Compared with the two-dimensional test, ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20G06F2119/06
Inventor 张军辉李崛郑健龙
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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