Reverse three-dimensional reconstruction and solid modeling method of pavement material skeleton structure

Abstract

The present invention relates to a reverse three-dimensional reconstruction and solid modeling method of a pavement material skeleton structure, and belongs to the technical field of construction engineering. The method comprises the following steps: three-dimensional scanning of experimental aggregates; 3D printing of experimental aggregates; installation of miniature wireless micro inertial sensors; preparation of the mixture containing the 3D printed aggregates; establishment of a point cloud coordinate system; conversion and reconstruction of the point cloud coordinate system; three-dimensional solid reconstruction modeling; and numerical simulation analysis. According to the method provided by the present invention, the actual situation of the mixture can be more accurately simulated,the influence of the mixture gradation on the mixture skeleton structure can be effectively studied, and a new method for evaluating whether the coarse aggregates form a stable skeleton structure isprovided.

Description

technical field [0001] The invention relates to a reverse three-dimensional reconstruction and solid modeling method of a pavement material skeleton structure, belonging to the technical field of construction engineering. Background technique [0002] In the early studies, in order to solve specific engineering problems, researchers mostly started from a macro perspective and used empirical indicators to determine whether the coarse aggregate formed a skeleton. However, engineering practice shows that the macroscopic mechanical properties of asphalt mixture are affected by its microscopic structural characteristics. Therefore, it is impossible to accurately determine whether the coarse aggregate forms a stable skeleton structure by using the average statistical index of performance on the macro scale. In recent years, with the development of computer and test analysis technology, researchers have carried out a lot of research work on the mesoscopic structural characteristic...

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Problems solved by technology

Among them, the two-dimensional digital image processing uses the sliced ​​image of the asphalt mixture specimen to obtain the mesoscopic structure information of the skeleton, combined with finite element, discrete element and other methods to numerically analyze the mesoscopic mechanical behavior of the aggregate skeleton, but the two The three-dimensional digital image processing technology cannot describe the three-dimensional spatial information of the skeleton structure, so it has limitations; with the development of X-ray CT non-destructive testing technology, computer tomography three-dimensional reconstruction technology has been introduced into the research field of asphalt mixture mesostructure, not only The three-dimensional feature information of the internal structure of the mixture can be obtained, and the subtle changes inside the mixture before and after the load can be identified, and the mechanical behavior of the skeleton structure at the mesoscopic level can be analyzed in detail. However, X-ray CT technology can currently detect The size of the specimen is limited, the cost of use is high, the identification and separation accuracy of aggregates affect the analysis of particle contact state, etc., which limit the scope of promotion and service of this non-destructive testing and reconstruction technology in the field of pavement material research and road construction

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