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Stochastic structural model of rock and soil aggregates by continuum-based discrete element method

Science china(Technological sciences) 2005年第Z1期48卷 95-106页

作者： wang yuannian1, zhao manhong., LI Shihai1 & {2. wang2.. institute of Mechanics, chinese academy of sciences, beijing 100080, china 2. Tropical Marine Science institute, National University of Singapore, 10 Kent Ridge Crescent, Singapore 1192.0 institute of Mechanics Chinese Academy of Sciences Beijing China Tröpical Marine Science institute National University of Singapore Singapore

This paper first presents a stochastic structural model to describe the random geometrical features of rock and soil aggregates. The stochastic structural model uses mixture ratio, rock size and rock shape to construct the microstructures of aggregates, and introduces two types of structural elements (block element and jointed element) and three types of material elements (rock element, soil element, and weaker jointed element) for this microstructure. Then, continuum-based discrete element method is used to study the deformation and failure mechanism of rock and soil aggregate through a series of loading tests. It is found that the stress-strain curve of rock and soil aggregates is nonlinear, and the failure is usually initialized from weaker jointed elements. Finally, some factors such as mixture ratio, rock size and rock shape are studied in detail. The numerical results are in good agreement with in situ test. Therefore, current model is effective for simulating the mechanical behaviors of rock and soil aggregates.

关键词： CDEM, rock and soil aggregate, mixture ratio.

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A Computational Model for Simulation of Fractured Materials Using Continuum-Based Discrete Element Method(CDEM)

A Computational Model for Simulation of Fractured Materials ...

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The Sixth World Congress on Computational Mechanics in Conjunction with the Second Asian-Pacific Congress on Computational Mechanics

作者： manhong.zhao, Shihai Li, {2. wang', j. g. wang institute of Mechanics, chinese academy of Science, beijing 10080, china Tropical Marine Science institute, National University of Singapore, 1192.0 Singapore

Based on the continuum-based discrete element method (CDEM), this paper presents a computational' model to simulate fractured materials. The relationship of macroscopic failure of material and internal rupture strain strength is exploited. First, the CDEM treats the 8-node solid isoparametric element in FEM as a fundamental system composed of 8 particles and interconnecting springs. A complete process from continuum to discontinuum under loading can be simulated by CDEM. Second, a spring changes its properties if this spring is intersected by a fracture: 1, the shear and tension forces are equal to zero on fracture plane when the spring in normal direction of the fracture plane is in tension. 2. When the spring is in compression, the normal force in the fracture plane is the projection of spring force in normal direction, and the shear force in the fracture plane is the one in tangential direction. When the normal and shear forces satisfy the Mohr-Coulomb failure criterion, the spring fails and the spring stiffness should be revalued. Third, the stress to strain curve for fractured samples are tested under tension and compression. It is found that the material performs linear elasticity when fracture density is small and external load is low. However, nonlinearity occurs with the larger load. Furthermore, the 'hardening' and 'softening' property of fractured material is simulated under displacement loading test.

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