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A continuum method for granular collapse with μ(I)-rheology-based dynamic earth pressure coefficient

Particuology 2021年第5期19卷 214-226页

作者： Jianbo Fei Yuxin Jie Hao Xiong Chengyu Hong Underground Polis Academy Shenzhen UniversityShenzhen 518060China Key Laboratory of Coastal Urban Resilient Infrastructures(MOE) Shenzhen UniversityShenzhen 518060China College of Civil and Transportation Engineering Shenzhen UniversityShenzhen 518060China State Key Laboratory of Hydroscience and Engineering Tsinghua UniversityBeijing 100084China

In this paper,a continuum model with dynamic earth pressure coefficient is established to describe the granular slump process by introducingμ(I)rheology.This rheology is adopted to quantify the normal stresses in our proposed model rather than shear stresses in classical models.The constitutive laws of different depth-averaged continuum approaches including the hydrodynamic,Savage–Hutter and proposed models are comparatively investigated in terms of the rheological effects on the spread of a granular column.The simulation results indicate that the proposed dynamic model captures some significant features during granular slump on inclined planes with different inclination angles(for example,the runout distance,runout time,and final profile).The proposed model can also reproduce the inner static sided axisymmetric region observed in tests when the granular column's initial aspect ratio(ratio of height to radii)is small.

关键词： Granular material Slump Rheology continuum method

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NUMERICAL SIMULATION OF MECHANICAL BEHAVIORS OF SUPERCONDUCTING POWDER BSCCO (BiSrCaCuO)

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Chinese Journal of Mechanical Engineering 2007年第3期20卷 59-61页

作者： ZHAO Yinghong LEI Liping ZENG Pan Key Laboratory for Advanced Materials Processing Technology of Ministry of Education Beijing 100084 China Department of Mechanical Engineering Tsinghua University Beijing 100084 China

An equivalent continuum method and a deformable discrete method to describe the mechanical behaviors of superconducting powder BSCCO （BiSrCaCuO） aggregate are studied syste-matically. The equivalent continuum model idealizes the aggregation of the powder as an equivalent continuum material. The powder aggregate yielding is caused by not only the deviatoric stress but also the hydrostatic stress and the modified Drucker-Prager/Cap model is adopted to describe the mechanical behaviors of BSCCO powder aggregate in continuum method. The deformable discrete model is known as a direct model, which considers the discrete nature of the powder particles. Its framework encompasses the local behaviors between the particles, such as particles contact, sliding and rolling. Based on commercial finite element software ABAQUS, the equivalent continuum model and the deformable discrete model are used to simulate the confined compression of superconducting powder BSCCO, and the numerical results show agreement with experimental results, which verify the correctness of these built models. Compared with the equivalent continuum model based on macroscopic statistics method, the deformable discrete model can present the microscopic information during processing and can describe the nature of mechanical behaviors of superconducting powder BSCCO. But from an industrial viewpoint, the equivalent continuum model has a definitive edge over the microscopic models in that the gross behavior of the powder mass can be modeled and simulated on an industrial scale.

关键词： BSCCO（BiSrCaCuO） Mechanical behaviour Discrete method continuum method

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