Temperature field analysis method of bituminous mixture test piece on the basis of discrete element simulation

Abstract

The invention discloses a temperature field analysis method of a bituminous mixture test piece on the basis of discrete element simulation, belongs to the technical field of bituminous mixture, and solves the problem that a finite element method can not accurately analyze the internal temperature field of the bituminous mixture test piece in a high-temperature environment. The temperature field analysis method comprises the following steps: firstly, forming the bituminous mixture test piece, collecting a digital image of irregular aggregate distribution, and converting the digital image into a digital test piece of a two-dimensional CAD (Computer-Aided Design) image format after the digital image is subjected to image processing; then, importing discrete element software, independently generating irregular aggregate and bituminous mortar according to the positions of aggregate blocks and the bituminous mortar, and constructing a two-dimensional test piece discrete element model; simulating a situation that the test piece is heated in the high-temperature environment, setting a boundary condition of the test piece model, the thermophysical property parameters of the aggregate and the bituminous mortar and the internal contact thermal resistance of a unit; and applying certain constant-high-temperature and room-temperature heat flow around the test piece model, recording the temperature change situations of each point in the test piece at different moments, drawing a comparison graph, and combining with a temperature field and a heat flow distribution cloud chart generated by the software to analyze the temperature field of the bituminous mixture test piece.

Description

technical field [0001] The invention relates to a method for analyzing the temperature field of an asphalt mixture test piece based on discrete element simulation, in particular to a method for accurately analyzing the internal temperature field of an asphalt mixture test piece in a high-temperature environment, and belongs to the technical field of asphalt mixture. Background technique [0002] The performance of asphalt mixture is closely related to its microstructure. With the improvement of computer technology and the development of computing technology, numerical simulation is more and more favored by many scholars. At present, the numerical simulation methods for analyzing the temperature field of asphalt mixture mainly include: finite element method and discrete element method. When the finite element method is used to study the performance of asphalt mixture, the researchers assume that the materials of the asphalt mixture are homogeneous, continuous, and isotropic, ...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for analyzing the temperature field of asphalt mixture specimens based on discrete element simulation, which fully considers the discontinuity of the mesoscopic structure of asphalt mixture specimens, and can better solve the problem of finite element method in the analysis of high temperature. Inaccurate internal temperature field of asphalt mixture specimens in the environment

[0010] In view of the fact that the discontinuity of the mesoscopic structure of the asphalt mixture specimen cannot be fully considered when the finite element method is used to analyze the temperature field of the asphalt mixture specimen, and it is difficult to accurately analyze the internal temperature field of the asphalt mixture specimen in a high-temperature environment. Discrete element method analyzes the change law of the internal temperature field of the asphalt mixture specimen in the high temperature environment, more accurately understands the internal temperature distribution of the asphalt mixture specimen in the high temperature environment, and lays the foundation for the study of the mechanical and deformation properties of the asphalt mixture in the high temperature environment

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