Effects of retained dry material on the impact,overflow and landing dynamics

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外文摘要：During long-term operation,the performance of obstacles would be changed due to the material accumulating upslope the obstacle.However,the effects of retained material on impact,overflow and landing dynamics of granular flow have not yet been elucidated.To address this gap,physical flume tests and discrete element simulations are conducted considering a range of normalized deposition height h0/H from 0 to 1,where ho and H represent the deposition height and obstacle height,respectively.An analytical model is modified to evaluate the flow velocity and flow depth after interacting with the retained materials,which further serve to calculate the peak impact force on the obstacle.Notably,the computed impact forces successfully predict the experimental results when α ≥ 25°.In addition,the results indicate that a higher h0/H leads to a lower dynamic impact force,a greater landing distance L,and a larger landing coefficient Cr,where Cr is the ratio of slope-parallel component of landing velocity to flow velocity just before landing.Compared to the existing overflow model,the measured landing dis-tance L is underestimated by up to 30％,and therefore it is insufficient for obstacle design when there is retained material.Moreover,the recommended Cr in current design practice is found to be non-conservative for estimating the landing velocity of geophysical flow.This study provides insightful sci-entific basis for designing obstacles with deposition.

外文关键词：

Granular flowObstacle depositionImpactOverflowLanding

作者：

Jun Fang、Yifei Cui、Haiming Liu

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作者单位：

State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing,China

Department of Civil and Environmental Engineering,The Hong Kong University of Science and Technology,Hong Kong,China

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaResearch Grants Council of the Hong Kong Special Administrative Region,China

项目编号：

4212010400241941019AoE/E-603/18

出版年：

2024

DOI：

10.1016/j.jrmge.2023.11.024

岩石力学与岩土工程学报(英文版)

中国科学院武汉岩土力学所中国岩石力学与工程学会武汉大学

岩石力学与岩土工程学报(英文版)

CSTPCD

影响因子：0.404

ISSN：1674-7755

年,卷(期)：2024.16(9)