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Modelling erosion of a single rock block using a coupled CFD-DEM approach

Journal of rock Mechanics and Geotechnical Engineering 2023年第9期15卷 2375-2387页

作者： Penghua Teng Fredrik Johansson J.Gunnar I.Hellström Division of Fluid and Experimental Mechanics Department of Engineering Sciences and MathematicsLuleåUniversity of TechnologyLuleåSE-97187Sweden Division of Soil and rock Mechanics KTH Royal Institute of TechnologyStockholmSE-10044Sweden

rock block removal is the prevalent physical mechanism for rock erosion and could affect the stability of dam foundations and *** this,understanding of block removal is still inadequate because of the complex interactions among block characteristics,hydraulic forces,and erosive processes acting on the ***,based on a previously conducted physical experiment of erosion of a single rock block,the removal processes of two different protruding blocks are represented by a coupled computational fluid dynamics-discrete element model(CFD-DEM)approach under varied flow ***,the blocks could be rotated with respect to the flow direction to consider the effect of the discontinuity orientation on the block removal *** results visualize the entire block removal *** simulations reproduce the effects of the discontinuity orientation on the critical flow velocity inducing block incipient motion and the trajectory of the block motion observed in the physical *** numerical results present a similar tendency of the critical velocities at different discontinuity orientations but have slightly lower *** trajectory of the block in the simulations fits well with the experimental *** relationship between the dimensionless critical shear stress and discontinuity orientation observed from the simulations shows that the effect of block protrusion becomes more dominant on the block incipient motion with the increase of relative protrusion *** our knowledge,this present study is the first attempt to use the coupled finite volume method(FVM)-DEM approach for modelling the interaction behavior between the block and the flowing water so that the block removal process can be reproduced and analyzed.

关键词： rock erosion Block removal Incipient motion Coupled CFD-DEM Critical shear stress

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A state‑of‑the‑art review on rock seepage mechanism of water inrush disaster in coal mines

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International Journal of Coal Science & Technology 2022年第4期9卷 1-28页

作者： Dan Ma Hongyu Duan Jixiong Zhang Haibo Bai School of Mines China University of Mining and TechnologyXuzhou 221116JiangsuChina State Key Laboratory of Coal Resources and Safe Mining China University of Mining and TechnologyXuzhou 221116JiangsuChina MOE Key Laboratory of Deep Coal Resource Mining China University of Mining and TechnologyXuzhou 221116JiangsuChina Department of Sustainable Development Environmental Science and EngineeringRoyal Institute of Technology10044 StockholmSweden State Key Laboratory of Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116JiangsuChina

Water inrush is one of the most dangerous disasters in coal *** to the large-scale mining and complicated hydrogeological conditions,thousands of deaths and huge economic losses have been caused by water inrush disasters in *** are two main factors determining the occurrence of water inrush:water source and water-conducting *** on the formation mechanism of the water-conducting pathway is the main direction to prevent and control the water inrush,and the seepage mechanism of rock mass during the formation of the water-conducting pathway is the key for the research on the water inrush *** paper provides a state-of-the-art review of seepage mechanisms during water inrush from three aspects,i.e.,mechanisms of stress-seepage coupling,fow regime transformation and rock *** numerical methods and experimental analysis,the evolution law of stress and seepage felds in the process of water inrush is fully studied;the fuid movement characteristics under diferent fow regimes are clearly summarized;the law of particle initiation and migration in the process of water inrush is explored,and the efect of rock erosion on hydraulic and mechanical properties of the rock media is also ***,some limitations of current research are analyzed,and the suggestions for future research on water inrush are proposed in this review.

关键词： rock seepage mechanism Water inrush Coal mine Stress-seepage coupling Flow regime transformation rock erosion

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Influence of abrasive hardness on erosion wear of abrasive air jets

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Journal of Central South University 2020年第2期27卷 356-371页

作者： LIU Yong CHEN Chang-jiang WEI Jian-ping LIU Xiao-tian WANG Xiang-dong State Key Laboratory Cultivation Base for Gas Geology and Gas Control Henan Polytechnic UniversityJiaozuo 454000China State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization Jiaozuo 454000China Safety Technology Training Institute Henan Polytechnic UniversityJiaozuo 454000China Huajin Coking Coal Co. Ltd.Lüliang 033000China

To make clear the influence of abrasive hardness on the erosion effect,the erosion experiments of abrasive air jet with the same impact energy were carried *** influence of abrasive hardness on the erosion effect is clarified by comparing the different erosion *** main conclusions are as *** the same mass flow rate and mesh number,the abrasive with a higher density needs greater pressure irrespective of *** erosion damage,the abrasive size exhibits a Weibull *** shape parameterβand Weibull distribution function of four types of abrasives are derived by the least squares method;moreover,βis found to have a quadratic relation with abrasive *** results of the erosion experiments show that abrasive hardness and erosion depth are quadratically *** calculating the increase in surface energy after abrasive erosion crushing,it is found that abrasive hardness has a quadratic relation with surface energy and that the increases in erosion depth and surface energy consumption are basically *** conclusion,the effect is a soft abrasive impact when the ratio of abrasive hardness(Ha)to the material hardness(Hm)is3.

关键词： abrasive air jet abrasive hardness rock erosion abrasive size distribution coal bed methane

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