Asphalt mixture shear strength analysis methodbased on discrete elements

A technology of asphalt mixture and shear strength, which is applied in the direction of using stable shear force to test material strength, analyze materials, strength characteristics, etc., can solve the problem of less research on shear performance, and achieve particle number reduction and accuracy The effect of improving and improving computing efficiency

Pending Publication Date: 2021-07-27
ZHEJIANG UNIV
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Problems solved by technology

At present, most of the research focuses on the fatigue failure and compression deformation of asphalt mixture, and there are few studies on the shear performance.

Method used

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  • Asphalt mixture shear strength analysis methodbased on discrete elements
  • Asphalt mixture shear strength analysis methodbased on discrete elements
  • Asphalt mixture shear strength analysis methodbased on discrete elements

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Embodiment Construction

[0044] In order to illustrate the specific operation method of the present invention in more detail, the embodiment of the invention will be described below with an example of a two-dimensional model, and the specific steps are as follows:

[0045] (1) Establish a two-dimensional irregular aggregate aggregate library: take pictures to obtain the image of the cut section of the standard sample in the indoor test, and convert it into a two-dimensional image file that can be recognized by the software through processing, such as figure 1 (a) shown.

[0046] (2) DEM sample generation: generate asphalt mixture test space, the size is 100mm in diameter * 150mm in height. Aggregate with a particle size below 2.36 mm and the asphalt part are considered as asphalt mortar, represented by round particles with a radius of 0.3 mm. For the rest of the aggregates, the average value of the upper and lower sieve sizes will be used as the actual particle size, which is calculated according to ...

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Abstract

The invention discloses an asphalt mixture shear strength analysis method based on discrete elements, and belongs to the technical field of asphalt mixture numerical calculation. The method mainly comprises the following steps: establishing a two-dimensional irregular aggregate library by processing an indoor asphalt mixture test piece image; generating discrete element samples according to test specifications; replacing the circular aggregate with an irregular aggregate particle cluster; uniformly filling the sample space with circular particles with the same size, converting the particles overlapped with the irregular particle cluster into new irregular aggregates, retaining the contour parts of all the irregular aggregates, and deleting the filled particles inside; giving specific contact models to different inter-particle contact types, and applying corresponding contact parameters at the same time; confining pressure is applied to the sample through a servo mechanism, and consolidation is carried out; and controlling the lateral confining pressure, moving the upper wall body downwards, and testing the shear strength of the sample. The method can also be used for a three-dimensional model, influence of different grades on the shear strength of the asphalt mixture is analyzed, the shear deformation micromechanism of the asphalt mixture is studied, and the accuracy is high.

Description

technical field [0001] The invention relates to the field of road engineering numerical calculation, in particular to a method for analyzing the shear strength of asphalt mixture based on discrete elements. Background technique [0002] With the proposal of my country's transportation power strategy, the country's road construction has developed rapidly. By the end of 2019, the total mileage of my country's highways reached 5.0125 million kilometers, and the maintenance mileage reached 4.9531 million kilometers, accounting for 98.8% of the total national highway mileage, of which asphalt pavement It is the main form of pavement. However, due to the characteristics of asphalt materials, asphalt pavement needs to withstand long-term natural environment, such as high temperature, ultraviolet rays, rain, air oxidation and other environmental factors. affect driving comfort. Among them, rutting is the most typical form of disease on asphalt pavement. Many studies have shown that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/24
CPCG01N3/24G01N2203/0003G01N2203/0025G01N2203/006G01N2203/0256G01N2203/0284G01N2203/0647
Inventor 罗雪刘港归张裕卿
Owner ZHEJIANG UNIV
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