Method for building graded broken stone shear resistance number value prediction models

A technology of grading crushed stone and pre-estimating model, which is used in electrical digital data processing, special data processing applications, and testing the strength of materials by applying a stable shear force. The evaluation of layer shear resistance is single and other problems, to achieve the effect of rapid judgment, improve efficiency, and reduce the capacity of the original disk

Active Publication Date: 2018-03-13
SOUTHEAST UNIV
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Problems solved by technology

However, in the existing road engineering, the evaluation of the shear performance of the graded crushed stone layer is relatively simple, mainly relying on indoor tests. Not only is the operation complicated, but the test results are also affected by the external environment. At the same time, a large number of indoor tests are costly. Inability to quickly and comprehensively evaluate the material properties of graded crushed stone

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  • Method for building graded broken stone shear resistance number value prediction models
  • Method for building graded broken stone shear resistance number value prediction models
  • Method for building graded broken stone shear resistance number value prediction models

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[0030] The present invention will be further described below in conjunction with the accompanying drawings.

[0031] Such as figure 1 shown, including the following steps:

[0032] (1) Select 5 sample particles, the particle size should be between 19-26.5mm, and the angular shape is relatively obvious. At the same time, the length of the selected sample particles should not be greater than 2.4 times the particle size, and the thickness should not be less than the particle size 0.4 times;

[0033] (2) Virtual modeling of coarse aggregate particles: Obtain the contour coordinates of five sample particles through image processing technology, scale all the coordinate data to the coordinate data of particles with a particle size of 19mm, and perform certain edge screening, and The coordinate data after zooming and screening are imported into PFC2D, and the virtual particles with a particle size of 19mm are formed, and the control random number of each particle size is established...

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Abstract

The invention discloses a method for building graded broken stone shear resistance number value prediction models. The method includes the steps: (1) selecting sample particles; (2) virtual modeling of coarse aggregate particles: acquiring contour coordinates of the sample particles and building virtual particle matrix samples to form large-batch particles; (3) virtual modeling of shear test parts: building wall models to simulate test models, and removing error escape particles in a screened manner; (4) virtual shear model loading: giving a servo operation mechanism and a constant-speed operation mechanism to the wall models in different stages to simulate stress and strain control modes in a shear-resistant test; (5) test result counting and arrangement: recording stress and strain curves in shear-resistant test processes and stress and strain data in the limit breaking state. According to the method, the graded broken stone shear resistance number value prediction models are built in a batch manner, numerical simulation of shear-resistant evaluation is achieved, and shear-resistant characteristics of graded broken stones can be rapidly evaluated.

Description

technical field [0001] The invention relates to a road engineering numerical simulation method, in particular to a method for establishing a numerical prediction model of the shear performance of graded gravel. Background technique [0002] As the most basic road material, graded macadam is widely used in the base and subbase of asphalt pavement. As a functional structure supporting the pavement, the shear performance of the graded macadam layer is very important. High shear resistance The strength can make the graded crushed stone layer have better bearing capacity and ensure the smoothness of the surface layer. However, in the existing road engineering, the evaluation of the shear performance of the graded crushed stone layer is relatively simple, mainly relying on indoor tests. Not only is the operation complicated, but the test results are also affected by the external environment. At the same time, a large number of indoor tests are costly. It is impossible to quickly ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/24G06F17/50
CPCG01N3/24G06F30/20
Inventor 马涛丁珣昊黄晓明张玉贞郭兆民
Owner SOUTHEAST UNIV
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