Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Numerical analysis of the effect of replacing the start-up frictional coefficient with soil strength parameters for granular flows
https://orcid.org/http://orcid.org/0000-0001-9781-8228
The moving particle semi-implicit method is further extended to study the effect of replacing the empirical start-up friction coefficient with shear strength parameters of dense granular materials. The tensorial formulation of the rheology model for dense granular flow is incorporated with a three-dimensional yield criterion to obtain a relationship with the angle of internal friction for granular materials. Implementing the local µ(I) rheology model in a continuum is adopted using hydrodynamic and elasto-viscoplastic constitutive frameworks. The viscosity regularization method is used for the hydrodynamic approach, and a homogenization procedure is adopted based on the classical rate-based hypoelastic–plastic approach, assuming finite deformation for the elasto-viscoplastic method. A two-dimensional (2D) simulation using the described numerical method is used to examine the mechanical properties of granular materials in different geometries. This present study aims to show the effects of yield stresses on the behavior of the rigid and flow arrest zones using the numerical method when the empirical start-up friction coefficient is replaced with the granular strength parameter. A quantitative comparison of the hydrodynamic and elasto-viscoplastic approaches with results from experiments shows that the strength parameter is suitable for describing the failure mechanics of the granular flows. Furthermore, this approach provides a good representation of the granular media stress field at low inertia and rest period without jeopardizing the rheological properties.
Numerical analysis of the effect of replacing the start-up frictional coefficient with soil strength parameters for granular flows
https://orcid.org/http://orcid.org/0000-0001-9781-8228
The moving particle semi-implicit method is further extended to study the effect of replacing the empirical start-up friction coefficient with shear strength parameters of dense granular materials. The tensorial formulation of the rheology model for dense granular flow is incorporated with a three-dimensional yield criterion to obtain a relationship with the angle of internal friction for granular materials. Implementing the local µ(I) rheology model in a continuum is adopted using hydrodynamic and elasto-viscoplastic constitutive frameworks. The viscosity regularization method is used for the hydrodynamic approach, and a homogenization procedure is adopted based on the classical rate-based hypoelastic–plastic approach, assuming finite deformation for the elasto-viscoplastic method. A two-dimensional (2D) simulation using the described numerical method is used to examine the mechanical properties of granular materials in different geometries. This present study aims to show the effects of yield stresses on the behavior of the rigid and flow arrest zones using the numerical method when the empirical start-up friction coefficient is replaced with the granular strength parameter. A quantitative comparison of the hydrodynamic and elasto-viscoplastic approaches with results from experiments shows that the strength parameter is suitable for describing the failure mechanics of the granular flows. Furthermore, this approach provides a good representation of the granular media stress field at low inertia and rest period without jeopardizing the rheological properties.
Numerical analysis of the effect of replacing the start-up frictional coefficient with soil strength parameters for granular flows
https://orcid.org/http://orcid.org/0000-0001-9781-8228
The moving particle semi-implicit method is further extended to study the effect of replacing the empirical start-up friction coefficient with shear strength parameters of dense granular materials. The tensorial formulation of the rheology model for dense granular flow is incorporated with a three-dimensional yield criterion to obtain a relationship with the angle of internal friction for granular materials. Implementing the local µ(I) rheology model in a continuum is adopted using hydrodynamic and elasto-viscoplastic constitutive frameworks. The viscosity regularization method is used for the hydrodynamic approach, and a homogenization procedure is adopted based on the classical rate-based hypoelastic–plastic approach, assuming finite deformation for the elasto-viscoplastic method. A two-dimensional (2D) simulation using the described numerical method is used to examine the mechanical properties of granular materials in different geometries. This present study aims to show the effects of yield stresses on the behavior of the rigid and flow arrest zones using the numerical method when the empirical start-up friction coefficient is replaced with the granular strength parameter. A quantitative comparison of the hydrodynamic and elasto-viscoplastic approaches with results from experiments shows that the strength parameter is suitable for describing the failure mechanics of the granular flows. Furthermore, this approach provides a good representation of the granular media stress field at low inertia and rest period without jeopardizing the rheological properties.
Numerical analysis of the effect of replacing the start-up frictional coefficient with soil strength parameters for granular flows
Acta Geotech.
Rufai, Olalekan (Autor:in) / Jin, Yee-Chung (Autor:in)
Acta Geotechnica ; 18 ; 4565-4582
01.09.2023
18 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Elasto-viscoplastic model , Granular collapse , Hydrodynamics model , Moving particle semi-implicit method , Regularization , Rheology model Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics
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