Discrete element method-based double-layer porous asphalt pavement drainage characteristic analysis method

A technology for asphalt pavement and characteristic analysis, applied in special data processing applications, instruments, electrical digital data processing, etc.

Pending Publication Date: 2020-12-25
NANJING FORESTRY UNIV
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Problems solved by technology

The present invention solves the problem that the continuum pavement model is difficult to characterize the irregular geometric shape of the aggregate, surface texture, adhesion force in the porous asphalt pavement, viscoelasticity and plasticity, pore mesoscopic structure, and the relationship between

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Embodiment Construction

[0013] The invention provides a method for analyzing the drainage characteristics of double-layer porous asphalt pavement based on the discrete element method. The specific implementation steps are as follows:

[0014] (1) Design the mix ratio of the asphalt mixture on the upper and lower layers of the double-layer porous asphalt pavement respectively, and determine the gradation of the upper and lower layers of the double-layer porous asphalt pavement, the optimal asphalt ratio and void ratio;

[0015] (2) Through the parameter calibration test, the shear modulus, density, dynamic and static friction coefficient, and collision recovery coefficient of the aggregate on the double-layer porous asphalt pavement and the lower layer are obtained;

[0016] (3) Construct a three-dimensional particle model framework of coarse and fine aggregates with different particle sizes, and import the discrete element software to fill the particle frame to generate coarse and fine aggregate enti...

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Abstract

The invention relates to a discrete element method-based double-layer porous asphalt pavement drainage characteristic analysis method, and belongs to the technical field of double-layer porous asphaltpavement drainage characteristics. By means of the discrete element simulation technology, the problems that irregular geometrical shapes and surface textures of aggregate are difficult to explain bya continuous medium pavement model, and adhesive force, viscoelastic plasticity, pore microstructure and drainage performance between an upper surface layer and a lower surface layer in a porous asphalt pavement influence each other are solved. According to the method, a double-layer porous asphalt pavement model is established mainly through discrete element software, coupling calculation is conducted on the double-layer porous asphalt pavement model and fluid dynamics software, and the double-layer porous asphalt pavement drainage characteristic rule is obtained through analysis. Accordingto the method, the irregular geometrical shape of the aggregate, the asphalt adhesive force and the granularity and the viscoelastic plasticity of the mixture can be well expressed, the asphalt mortarand gap three-phase structure formed by the drainage asphalt mixture serving as coarse aggregate, fine aggregate and an asphalt cementing material is effectively simulated, and the improvement of a model and drainage characteristic research accuracy is facilitated.

Description

technical field [0001] The invention relates to a method for analyzing drainage characteristics of double-layer porous asphalt pavement based on discrete element method, and belongs to the technical field of double-layer porous asphalt pavement. Background technique [0002] Bulk or granular materials such as asphalt concrete pavement are common in nature and engineering. In the past, macroscopic continuum mechanics theory was used to analyze bulk materials. is too large. With the advancement of computer technology, a new numerical method in the field of computational solid mechanics has emerged, that is, the discrete element method, modeling and discrete element simulation technology (EDEM). On this basis, the discrete element method is combined with other numerical analysis methods. The analysis method based on asphalt pavement research has changed from the continuum model to the discontinuous model. For the field of transportation and civil engineering, test analysis is...

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Application Information

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IPC IPC(8): G06F30/28G06F30/23G06F113/08
CPCG06F30/23G06F30/28G06F2113/08
Inventor 许涛孔成维许杰
Owner NANJING FORESTRY UNIV
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