DEM study on role of fines in mobility of dry granular flows considering particle size-shape correlation

Nie, Jia-Yan; Cui, Yifei; Wu, Zhijun; Zhang, Lei; Fang, Jun

doi:10.1016/j.compgeo.2023.105980

Cited by 11 publications

(1 citation statement)

References 58 publications

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“…The evolution of the seepage field within reservoir landslides is intricately influenced by rainfall and reservoir water level fluctuation [13][14][15][16][17]. This dynamic interplay disrupts the pre-existing equilibrium of the landslide, thereby exerting a consequential impact on its stability [18][19][20][21][22][23][24][25][26]. Particularly, the phreatic line serves as an effective delineator of seepage flow information within the landslide.…”

Section: Introductionmentioning

confidence: 99%

Phreatic Line Calculation of Reservoir Landslide under Complex Hydraulic Conditions—A Case Study

Zhang,

Ma,

Yuan

et al. 2024

Water

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A seepage field, influenced by rainfall and reservoir water level fluctuation, is closely associated with the stability of the reservoir landslide. Understanding the phreatic line variation inside the landslide is of significant importance for the analysis and evaluation of slope stability. Currently, most of the boundaries of phreatic line analytical models and the hydrological conditions are simplified, resulting in discrepancies between the outcomes derived from these models and the actual situation. Given this, the newly proposed analytical model is refined by addressing the following two issues. Firstly, the consideration of variable-speed reservoir level fluctuations is incorporated, and secondly, the reservoir bank within the water-level fluctuation zone is treated as non-vertical. Under the combined effect of reservoir water level fluctuation and rainfall, the Boussinesq Differential Equation of unsteady seepage is established and applied to the Majiagou landslide in Three Gorges reservoir area. The results of the analytical solution are basically consistent with the measured groundwater level results, which has demonstrated the accuracy of the proposed model. Consequently, the proposed model can quickly and accurately calculate the groundwater level of landslides, which provides an effective means for the prediction and early warning of reservoir landslides.

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Section: Introductionmentioning

confidence: 99%

Phreatic Line Calculation of Reservoir Landslide under Complex Hydraulic Conditions—A Case Study

Zhang,

Ma,

Yuan

et al. 2024

Water

Self Cite

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Collapse characteristics of binary granular columns considering inhomogeneous particle size distributions

Sun,

Jia,

Nicot

et al. 2024

Num Anal Meth Geomechanics

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Debris avalanches and dry granular flows exhibit similar characteristics. In order to comprehend the fundamental mechanisms and improve the accuracy in predicting disasters such as landslides, debris flows, and rock avalanches, the collapse characteristics of a binary granular column are investigated through a three‐dimensional discrete element model. A novel approach is proposed by incorporating the concept of local granular velocity fluctuation and applying a cluster analysis method. Then, the flow mechanism of the binary granular column is analyzed, by considering the inhomogeneous particle size distribution. The research results show that: (1) The normalized final packing height of the granular column gradually increases when the content of coarse particles exceeds 20% and when the coarse‐fine particle size ratio increases. Conversely, the normalized run‐out distance of the granular column decreases gradually with the increase in coarse particle content and the coarse‐fine particle size ratio. (2) The particles with higher granular velocity fluctuations tend to move together and form clusters, demonstrating dynamical heterogeneity. As the coarse particle content and coarse‐fine particle size ratio increase, there is a greater tendency for particles to assemble into larger‐scale active clusters. This means that a larger number of particles exhibit collective behavior during the collapse process, resulting in increased resistance to shear deformation. Ultimately, this leads to a greater packing height and a reduced run‐out distance when observed from a macroscopic perspective.

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A FEM‐DEM Coupling Analysis on Bearing Capacity of Sandy Soil Foundation Considering Fabric Anisotropy

Nie,

Mou,

et al. 2024

Num Anal Meth Geomechanics

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With the acceleration of urbanization, the stability of the foundation is being more crucial to the performance and service of the superstructure. As our understanding of the factors influencing soil's physical and mechanical behavior deepens, it becomes increasingly challenging for traditional limit equilibrium and limit analysis methods to accurately consider the complex factors affecting foundation stability, such as initial fabric anisotropy caused by the particle morphology and geological deposition in sand. Although some scholars had used advanced constitutive models in the finite element method (FEM) to investigate the influence of initial fabric anisotropy on mechanical responses of foundations, this approach failed to reveal the microscopic information underlying the shear failure of sandy soil foundations. In this study, the influence of the initial fabric anisotropy of sandy soil on the ultimate bearing capacity and shear failure mode of shallow foundation is studied using the hierarchical FEM and discrete element method (DEM) coupling analysis method. Four representative volume elements (RVEs) with varying initial bedding plane angles are constructed in DEM for characterizing different initial fabric anisotropies, and the specific stress–strain information of DEM RVEs is directly passed into the corresponding Gauss points in FEM to replace the conventional constitutive model. Numerical results show that the initial fabric anisotropy affects the ultimate bearing capacity and shear failure mode of shallow foundations significantly, and the corresponding micromechanical behaviors at different local Gauss points have been explored, which advances our understanding of the micromechanisms underlying the progressive shear failure of sandy soil foundations significantly.

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DEM study on role of fines in mobility of dry granular flows considering particle size-shape correlation

Cited by 11 publications

References 58 publications

Phreatic Line Calculation of Reservoir Landslide under Complex Hydraulic Conditions—A Case Study

Phreatic Line Calculation of Reservoir Landslide under Complex Hydraulic Conditions—A Case Study

Collapse characteristics of binary granular columns considering inhomogeneous particle size distributions

A FEM‐DEM Coupling Analysis on Bearing Capacity of Sandy Soil Foundation Considering Fabric Anisotropy

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