Discrete element and finite difference method coupled bituminous mixture simulation modeling method

Abstract

The invention discloses a discrete element and finite difference method coupled bituminous mixture simulation modeling method, which comprises the following steps of: realizing bituminous cement continuous medium simulation in a bituminous mixture by adopting a finite difference method through bituminous mixture aggregate discrete element treatment; by considering the influence of the coupling effect of discrete elements and a finite difference method on the mechanical properties such as the strength and modulus of the bituminousasphalt mixture, realizing the simulation of the processes such as deformation, shrinkage and cracking of the multi-phase material of the asphalt mixture under the action of different loads is realized. According to the invention, the real shapes and sizes of the aggregate and the cementing material in the asphalt mixture can be accurately restored; according to the method, the distribution characteristics of the porous structure and the void structure are represented, the limitations of discrete elements and finite difference methods on respective analysis methods of bituminous mixture numerical simulation are overcome, and the method is suitable for analyzing the problem of large viscoplasticity deformation of the bituminous mixture multiphase material under different conditions.

Description

technical field [0001] The invention relates to the numerical simulation of asphalt mixture, especially the coupling modeling and simulation method of three-dimensional discrete element and finite difference method. Background technique [0002] At present, the vast majority of new roads in the world are asphalt concrete pavement. However, the inhomogeneity and discreteness of the aggregate shape of asphalt mixture and the continuity of asphalt mortar material make it very difficult to simulate aggregate and asphalt mortar in the numerical simulation of asphalt mixture. Most of the previous studies used discrete elements to simulate asphalt mixtures. Although discrete elements have advantages in carefully considering the contact network and void distribution of aggregates, there are still large gaps when considering asphalt binder and dynamic large deformation. difficulty. Compared with other methods such as finite element, the biggest advantage of the finite difference me...

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Problems solved by technology

However, the inhomogeneity and discreteness of the aggregate shape of asphalt mixture and the continuity of asphalt mortar material make it very difficult to simulate aggregate and asphalt mortar in the numerical simulation of asphalt mixture

Most of the previous studies used discrete elements to simulate asphalt mixtures. Although discrete elements have advantages in carefully considering the contact network and void distribution of aggregates, there are still large gaps when considering asphalt binder and dynamic large deformation. difficulty

Compared with other methods such as finite element, the biggest advantage of the finite difference method is that it has a strong ability to deal with plastic deformation analysis, and can flexibly handle any constitutive model without bringing the unit stress to the yield interface. The flow problem is more efficient and accurate; however, the finite difference method can only deal with the stress-strain and displacement phenomena at the macroscopic level of asphalt mixture, and cannot analyze the contact interlocking between the void characteristics and aggregates at the microscopic level

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