Discrete element image modeling method based on digital speckle method

Abstract

The invention discloses a discrete element image modeling method based on a digital speckle method, belongs to the technical field of bituminous mixture digital design, and aims at solving the problemthat an existing discrete element model based on an image lacks local stress condition verification. The modeling method comprises the following steps: 1, acquiring an asphalt mixture section image;2, importing the section image into digital speckle software to obtain strain field distribution information in the horizontal direction; 3, extracting a mortar position strain field; 4, establishingan asphalt mixture indirect tensile test discrete element model; 5, applying load parameters the same as those in the indirect tensile test process in the step 1 to obtain mortar strain field distribution based on discrete element calculation; 6, quantifying the difference of strain field mean values of the discrete element method and the digital speckle actual measurement method; and 7, taking the strain field calculation error percentage P as an index for evaluating the discrete element modeling accuracy. According to the method, the calculation accuracy of the discrete element model based on the image is evaluated on the mesoscopic scale, so that the modeling of the discrete element image is optimized.

Description

technical field [0001] The invention belongs to the technical field of asphalt mixture digital design, and in particular relates to a discrete element image modeling method based on a digital speckle method. Background technique [0002] The design and optimization of asphalt mixture materials is the key to improving the performance of pavement, and it is also an important way to prolong the service life of roads and reduce maintenance costs. At present, the traditional design method of asphalt mixture is mainly based on indoor test, including Marshall design method and Superpave design method. The design method based on test is easy to operate, but the test consumes more labor and materials, and the data is highly discrete. [0003] Considering many problems in the traditional asphalt mixture design method, the digital design method based on numerical simulation technology has begun to be applied in the field of road engineering. Among them, the discrete element method is w...

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Problems solved by technology

[0004] The present invention aims to solve the problem that the existing image-based discrete element model lacks the verification of local force conditions, and provides a method for verifying the accuracy of discrete element image modeling based on digital speckle method

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