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浙江大学学报(工学版)
浙江大学学报(工学版)  2022, Vol. 56 Issue (6): 1232-1240    DOI: 10.3785/j.issn.1008-973X.2022.06.022
建筑与交通工程     
离散元模拟离心超重力场下的斜槽颗粒流
詹正书1,2(),赵宇1,2,梁腾1,2,*(),刘准1,2,王玮1,2
1. 浙江大学 建筑工程学院 岩土工程研究所，浙江 杭州 310058
2. 浙江大学 超重力研究中心，浙江 杭州 310058
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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摘要：

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    
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
收稿日期: 2021-10-27 出版日期: 2022-06-30
CLC:  P 694  
基金资助: 国家自然科学基金资助项目（51988101，52178359，52008368)
通讯作者: 梁腾     E-mail: zhanzhengshu@zju.edu.cn;tliang@zju.edu.cn
作者简介: 詹正书（1996—），男，硕士生，从事滑坡碎屑流研究. orcid.org/0000-0002-2548-9370. E-mail： zhanzhengshu@zju.edu.cn
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詹正书
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引用本文:

詹正书,赵宇,梁腾,刘准,王玮. 离散元模拟离心超重力场下的斜槽颗粒流[J]. 浙江大学学报(工学版), 2022, 56(6): 1232-1240.

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.

链接本文:

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

图 1  斜槽模型布置方式及坐标系
图 2  DEM模拟颗粒在旋转坐标系下的运动轨迹
图 3  DEM模拟颗粒流模型概况
参数 符号/单位 数值
颗粒密度 ρ/(kg·m ?3) 2 650
颗粒直径 d /mm 3.76
接触刚度 k /(N·m ?1) 1.0×10 7
法向阻尼系数 α n 0.3
切向阻尼系数 α t 0.2
内摩擦角 μ 0.468
抗转动系数 μ r 0.1
表 1  颗粒材料接触参数
图 4  超重力颗粒流试验的DEM模拟复现
图 5  颗粒流质心运动时程
图 6  模型布置方式对颗粒流堆积剖面的影响
图 7  0.05 s时的颗粒流速度分布
图 8  不同模型布置方式对颗粒流惯性指数的影响
图 9  超重力、斜槽坡度和粗糙度对颗粒流质心运动和剖面的影响
图 10  惯性指数在颗粒流流向上的分布
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