Method for randomly generating discrete element model of multi-structural-layer asphalt pavement

Abstract

The invention discloses a method for randomly generating a discrete element model of a multi-structural-layer asphalt pavement. According to parameters such as the layer number of the asphalt pavementstructure, the thickness of the structure layer and the calculated number of aggregate particles of each grade, a multi-structural-layer asphalt pavement model with irregular-shaped aggregates is randomly generated; different material parameters can be conveniently given to different grades or different aggregate particles by further grouping the aggregates; according to the method, random generation of the three-dimensional discrete element model of the multi-structural-layer asphalt pavement is realized, the internal microstructure of the multi-structural-layer asphalt pavement, including the microstructure at the interface between structural layers, is reflected, and the occupation of the storage space is also reduced according to the storage mode of the text file storage model.

Description

technical field [0001] The invention relates to a method for constructing a simulation model, in particular to a method for randomly generating a discrete element model of a multi-layer asphalt pavement. Background technique [0002] Asphalt mixture is a composite material composed of aggregate, mortar, and pores, and has important applications in road engineering. Numerical simulation using the discrete element method can study the pavement performance of asphalt mixture at the microscopic level. For the accuracy of numerical simulation, it is necessary to build a model that can truly reflect its internal microstructure. [0003] The existing asphalt mixture numerical model construction methods mainly include: [0004] (1) Randomly generate spherical particles of different sizes. This modeling method ignores the aggregate shape, which is inconsistent with the actual situation; [0005] (2) Obtain the section of the asphalt mixture specimen, and use digital image processin...

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Problems solved by technology

[0004] (1) Randomly generate spherical particles of different sizes. This modeling method ignores the aggregate shape, which is inconsistent with the actual situation;

[0005] (2) Obtain the section of the asphalt mixture specimen, and use digital image processing technology to reconstruct the model. The model obtained by this method can well reflect the real asphalt mixture specimen. Problems such as time-consuming and labor-intensive, heavy image processing workload, and small particles and pores cannot be accurately captured;

[0006] (3) The central ball diffusion method randomly generates irregular shaped aggregates for model building. This method can better reflect the flatness and angularity of aggregates and better characterize the real microstructure of asphalt mixtures. However, now Only a single specimen can be generated, and the mesoscopic structure of the pavement structure layer cannot be well characterized

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