岩石圆盘径向压缩破坏的Voronoi子块体单元DDA方法模拟

Subjects: Mechanics >> Basic Mechanics submitted time 2023-04-24 Cooperative journals: 《应用力学学报》

周大波 甯尤军 李春玉 王大国

Abstract： Discontinuous deformation analysis(DDA)is a numerical method that computes the mechanical behaviors of discrete deformable-block systems,which can be used to simulate the cracking failure of rock by the sub-block method.Considering the similarity of morphology between Voronoi polygonal particles and rock mineral grains shapes at the mesoscale,a generation method of Voronoi particle element model based on random circles is proposed.By simulating the cracking failure process of intact rock disc and rock discs with a pre-existing crack,the feasibility of simulating rock cracking failure with the Voronoi sub-block element DDA is verified.Results indicate that the rock disc shows higher integral strength with the decrease of the number of sub-block elements.With the increase of the element number,the crack initiation position is closer to that in reality,and the failure path gets clearer.With a large-enough number of the elements,the cracking failure simulation results of the discs with different pre-existing crack inclinations are highly consistent with the experimental results,and the influence of the center machining hole in the disc on the failure path can be accurately captured as well.The Voronoi sub-block element DDA can effectively simulate the cracking failure process of rock,which provides conditions for the further simulation of rock cracking failure with Voronoi particle elements.

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