考虑颗粒破碎的堆石体三维随机多面体细观数值模拟

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Abstract Based on the stochastic granular discontinuous deformation(SGDD) method，a cohesive zone model is employed to simulate the breakage of coarse aggregates. In this model the cohesive interface elements are inserted into the region of coarse aggregates；and the constitutive response of cohesive element is governed by an energy-based damage evolution law. If the interface between these sub-particles breaks，the breakage will happen. By using this model，it is possible to study the influence of particle breakage on the macroscopic properties of the rockfill，such as volumetric strain，shear strength and dilatancy angle. The numerical simulation results reveal that the strength of the coarse-grained material can significantly decrease due to particle breakage. The mechanism of this phenomenon lies in the weakening effect of dilatation due to particle breakage. Along with particle breakage，the acoustic emission(AE) occurs；and the AE count under higher confining pressure is greater than that under lower confining pressure. In the shear process，the contact normal orientation between particles is inclining gradually from horizontal direction to vertical direction. Furthermore，the main direction of normal contact force is the same as the loading direction；and the average normal contact force between particles increases gradually.

Key words： hydraulic engineering rockfill particle breakage mesomechanics stochastic simulation cohesive zone model

Received: 24 December 2010

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http://www.rockmech.org/EN/Y2011/V30/I8/1671

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