Bituminous mixture compaction simulation method based on discrete elements

Abstract

The invention discloses a bituminous mixture compaction simulation method based on discrete elements. The method comprises the steps that a prescribed space region is generated through a 'wall' command in PFC<3D> software, and the space region is randomly filled with a particle system composed of coarse aggregates and bituminous mortar; partial bituminous mortar is randomly deleted; corresponding contact types are given to the interior of the coarse aggregates, the interior of the bituminous mortar and the space between the coarse aggregates and the bituminous mortar in a bituminous mixture; a 'clump', formed by gathering basic unit particles, in the PFC<3D> software is set to serve as a rolling wheel of a road roller, and the static pressure action on the bituminous mixture is achieved through rolling wheels of the road roller under the action of gravity; excitation force is given to the 'clump', the excitation force of a 'clump' system is coupled with the gravity, and vibrating compaction action is simulated; compaction of compaction road rolling wheels to the bituminous mixture is controlled through fish language programming. The method is easy and convenient to use, economical and effective and has certain significance to construction of a bituminous mixture pavement.

Description

technical field [0001] The invention relates to discrete element numerical simulation technology of asphalt mixture, in particular to a discrete element-based asphalt mixture compaction simulation method. Background technique [0002] The compaction of asphalt mixture is the key process of pavement construction. A large number of studies have shown that the early failure of the pavement is directly related to the compaction quality of the pavement. If the degree of compaction is insufficient, the porosity of the pavement is too large, rainwater seeps into the interior of the pavement structure through the voids, and the pavement is prone to early damage such as water damage and rutting. If the degree of compaction is too large, the internal voids of the pavement structure will be too small, and phenomena such as oil flooding and instability are often found under high temperature conditions. The important influence of pavement compaction on road mechanical properties has al...

AI Technical Summary

Problems solved by technology

However, there are few studies on the compaction mechanism of asphalt mixtures using discrete elements. The existing two-dimensional models only use simple disks to represent aggregates. These elastic contact models such as parallel bonding can only simply simulate the static pressure process, but cannot truly reflect the compaction mechanism of asphalt mixture.

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