Discrete element simulation of granular chute flows within centrifugal field

doi:10.3785/j.issn.1008-973X.2022.06.022

Journal of ZheJiang University (Engineering Science)

2022, Vol. 56

Issue (6): 1232-1240 DOI: 10.3785/j.issn.1008-973X.2022.06.022

Discrete element simulation of granular chute flows within centrifugal field

Zheng-shu ZHAN1,2(

),Yu ZHAO1,2,Teng LIANG1,2,*(

),Zhun LIU1,2,Wei WANG1,2

1. Institute of Geotechnical Engineering, College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
2. Center for Hypergravity Experimental and Interdisciplinary Research, Zhejiang University, Hangzhou 310058, China

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Abstract

The discrete element method was used to simulate the motion of granular flow in the centrifugal field. The unsteady chute granular flow was studied to quantify the influence of Coriolis effect on the kinetic process of model. The simulation results were validated against the published centrifuge testing. The influence of experimental parameters such as model layout, slope angle, g level and basement friction on Coriolis effect in unsteady flow were quantified systematically from macro and micro scales. Results showed that the non-trivial effects of the Coriolis force highly altered the status of the granular flow regardless of model layout. And Coriolis effect was positive related to the chute angle and basement friction. However, the effect of the Coriolis force was in-sensitive to g level. In the field of hypergravity to simulate the kinetic failure process of geotechnical infrastructure, the development of test methods to neutralize Coriolis effect is a technical bottleneck that needs to be solved.

Key words： rapid and long runout landslide granular flow Coriolis effect macro flow pattern micro flow pattern

Received: 27 October 2021 Published: 30 June 2022

CLC:

P 694

Fund: 国家自然科学基金资助项目（51988101，52178359，52008368)

Corresponding Authors: Teng LIANG E-mail: zhanzhengshu@zju.edu.cn;tliang@zju.edu.cn

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Cite this article:

Zheng-shu ZHAN,Yu ZHAO,Teng LIANG,Zhun LIU,Wei WANG. Discrete element simulation of granular chute flows within centrifugal field. Journal of ZheJiang University (Engineering Science), 2022, 56(6): 1232-1240.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2022.06.022 OR https://www.zjujournals.com/eng/Y2022/V56/I6/1232

离散元模拟离心超重力场下的斜槽颗粒流

以非稳态斜槽颗粒流为切入点，利用离散元方法再现颗粒流在离心超重力场中的运动机制，以量化科里奥利效应对岩土体动力过程的影响.利用已发表的离心试验数据验证数值模型的可靠性；从宏观和细观尺度系统量化非稳态流中模型布置方向、斜槽倾角、超重力、斜槽底面粗糙度等试验参数对科里奥利效应的影响规律. 结果表明，在不同模型布置方向下，科里奥利力会大幅改变颗粒流的流态，科里奥利效应与斜槽倾角以及斜槽底面粗糙度正相关，但是科里奥利效应对超重力不敏感.研发抵消科里奥利效应的试验手段是岩土体动力灾变超重力离心模拟领域亟须解决的技术瓶颈之一.

关键词： 高速远程滑坡, 颗粒流, 科里奥利效应, 宏观流态, 细观流态

Fig.1 Model layout and reference system

Fig.2 DEM simulates trajectory of particles in rotating reference system

Fig.3 Overview of DEM simulation granular flow model

Tab.1 Contact parameters of materials

Fig.4 DEM simulated reproducible hypergravity granular flow experiments

Fig.5 Centroid motion time-history curves for granular flows

Fig.6 Influence of model layout on granular flow accumulation profile

Fig.7 Velocity distribution of granular flow at 0.05 s

Fig.8 Influence of different model layout on inertia index of granular flow

Fig.9 Influence of g level, chute slope and roughness on centroid motion and profile of granular flow

Fig.10 Distribution of inertia index in granular flow direction


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