Asphalt mixture fatigue test numerical simulation method based on random generation

Abstract

The invention discloses an asphalt mixture fatigue test numerical simulation method based on random generation. The method comprises the steps of randomly generating a test piece; determining the particle number, grading and irregular shape of coarse aggregates according to the test piece to be formed; determining that the coarse aggregates are not overlapped; generating irregular coarse aggregates; determining the minimum discrete unit size of bituminous mortar; filling the bituminous mortar; determining bituminous mortar grading and the dosage of asphalt in bituminous mortar according to the grading of an asphalt mixture; acquiring relative material parameters according to a bituminous mortar creep test and a spitting test; determining void ratio and void distribution and generating voids; conducting fatigue test numerical simulation; determining a virtual loading mode; conducting loading with a servo mechanism; conducting fatigue failure judgment. Through random test piece generation, three-dimensional configuration reconstruction of the asphalt mixture is achieved. By the adoption of the method, three-dimensional reconstruction of various grading levels, various void ratios and various asphalt mixtures can be achieved, and digital test piece reconstruction efficiency and accuracy are improved greatly.

Description

technical field [0001] The invention relates to discrete element simulation technology of asphalt mixture, in particular to a numerical simulation method for fatigue test of asphalt mixture based on random generation, and belongs to the technical field of road engineering. Background technique [0002] To simulate and estimate the fatigue life of asphalt mixture, it is first necessary to obtain dense asphalt mixture specimens. When using the discrete element method to model, the specimens are usually prepared under the conditions of known gradation, asphalt ratio and void ratio. If the above conditions are known, the asphalt mixture fatigue specimen can be established according to the ratio of each component for three-dimensional fatigue test loading. It should be known that in order to avoid the large difference in the macroscopic fatigue test results and affect the reliability of the test results, each mixture specimen needs to carry out multiple parallel tests, which is ...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a numerical simulation method for asphalt mixture fatigue test based on random generation, which is a discrete element virtual fatigue test method for asphalt mixture under the conditions of known gradation, asphalt-stone ratio and void ratio, which can quickly The discrete element samples of asphalt mixture with specific coarse aggregate and void distribution can be obtained accurately, and the fatigue life of asphalt mixture can be estimated by using the servo control mechanism to solve the problems of high cost, time-consuming and volatility of test results in the current macro-fatigue test. question

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