A method for constructing a mesomechanical model of graded crushed stone and calibrating micromechanical parameters

A technology of micromechanical parameters and graded crushed stone, which is used in the application of stable shear force to test the strength of materials, scientific instruments, measuring devices, etc. Difficulties in the study of crushed stone, structural characteristics and mechanical properties of difficult graded crushed stone

Inactive Publication Date: 2011-11-30
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the finite element method is mainly used to numerically simulate the physical and mechanical properties of graded crushed stones. However, the numerical model constructed by this method can neither characterize the granular structure o

Method used

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  • A method for constructing a mesomechanical model of graded crushed stone and calibrating micromechanical parameters
  • A method for constructing a mesomechanical model of graded crushed stone and calibrating micromechanical parameters
  • A method for constructing a mesomechanical model of graded crushed stone and calibrating micromechanical parameters

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Embodiment 1

[0072] Such as figure 1 As shown, this embodiment provides a method for constructing a mesomechanical model of graded crushed stone and calibrating micromechanical parameters. Taking the numerical simulation of the CBR test as an example, the following steps are carried out:

[0073] 1) Construction of mesomechanical model

[0074] (1) Test of basic parameters:

[0075] The crushed stone density test results are shown in Table 1, and the mineral material gradation and maximum dry density are shown in Table 2.

[0076] Table 1 Crushed stone density

[0077] 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

[0078] Table 2 Mineral material grading

[0079]

[0080] (2) Simulation of mold trial

[0081] The size of the test mold used in the CBR indoor test is Φ15.2cm×h15cm. Using PFC 2D The command "wall" generates two vertical...

Embodiment 2

[0121] see figure 1 , a method for constructing a mesomechanical model of graded crushed stone and calibrating micromechanical parameters in this embodiment, taking the numerical simulation of a triaxial test as an example, proceeds according to the following steps:

[0122] 1) Construction of mesomechanical model

[0123] (1) Test of basic parameters:

[0124] The crushed stone density test results are shown in Table 5, and the mineral material gradation and maximum dry density are shown in Table 6;

[0125] Table 5 Crushed stone density

[0126] 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

[0127] Table 6 Mineral Material Grading

[0128]

[0129] (2) Simulation of mold trial

[0130] The size of the test mold used in the indoor triaxial test is Φ30cm×h75cm. Using PFC 2D The built-in command "wall" generates a closed ...

Embodiment 3

[0163] see figure 1 , a method for constructing a mesomechanical model of graded gravel and calibrating micromechanical parameters in this embodiment, taking the numerical simulation of a direct shear test as an example, proceeds in the following steps:

[0164] 1) Construction of mesomechanical model

[0165] (1) Test of basic parameters

[0166] The crushed stone density test results are shown in Table 9, and the mineral material gradation and maximum dry density are shown in Table 10;

[0167] Table 9 Crushed stone density

[0168] 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

[0169] Table 10 Mineral Material Grading

[0170]

[0171] (2) Simulation of mold trial

[0172] Simulation of the Upper Shear Box: Using PFC 2D The built-in command "wall" generates two vertical walls with a length of 7.5cm and one horizontal w...

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Abstract

The invention discloses a method for constructing a graded crushed rock micro-mechanical model and calibrating a micro-mechanical parameter. The graded crushed rock micro-mechanical model is constructed through a test on a graded crushed rock basic parameter, simulation of a test mold and generation of the simulation test piece by endowing the micro-mechanical parameter to a simulation test piece; a micro-mechanical model test piece is subjected to a value experiment, so that a graded crushed rock stress strain curve is obtained through stimulation; and the micro-mechanical parameter of the graded crushed rock micro-mechanical model can be calibrated by analyzing the comparison between an actual test result and a simulation structure of graded crushed rock stress strain according to a simulation error precision requirement. By the method, the graded crushed rock micro-mechanical model can be constructed accurately and quickly and the micro-mechanical parameter can be calibrated, so that an effective tool is provided for deep research on a mechanical behavior and a damage mechanism of graded crushed rocks.

Description

technical field [0001] The invention belongs to the field of traffic civil engineering, and relates to a method for constructing a mesomechanical model of graded gravel and calibrating micromechanical parameters. The present invention is based on PFC 2D The software platform can accurately and quickly construct the mesoscopic mechanical model of graded crushed stone and calibrate the micromechanical parameters, providing an effective tool for in-depth research on the mechanical behavior and failure mechanism of graded crushed stone. Background technique [0002] Graded crushed stone is a typical road base material with extremely complex physical and mechanical properties. Indoor test methods are not only difficult to characterize the granular structural characteristics and nonlinear mechanical properties of graded crushed stone, but also have a long test period and high research costs. Numerical simulation method has gradually become an effective tool for the study of mech...

Claims

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Application Information

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IPC IPC(8): G01N3/00G01N3/24
Inventor 蒋应军任皎龙徐寅善李頔李思超刘延金
Owner CHANGAN UNIV
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