NDLI: Numerical Evolution of Localized Dilated Shear Zones

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Numerical Evolution of Localized Dilated Shear Zones

Content Provider	Scilit
Author	Nübel, Konrad Gudehus, Gerd
Copyright Year	2021
Description	Evolutions of the void ratio e are calculated for dry granular bodies under plane strain conditions with different uniform boundary stresses or displacements. Initial states are prescribed with homogeneous or linear stress fields with a mean void ratio below the critical void ratio e c . Spatial fluctuations of the void ratio with exponential distribution are attributed to the elements. The hypoplastic constitutive relation models dilatancy and stress ratio peak for continued shearing with e < e c . Δe and shear strains increase preferably in narrow strips in two directions with respect to principal stress axes. The positive feedback leads to one or two shear bands in slender biaxial bodies, as observed in experiments. Biaxial compression of flat bodies leads to a zig-zag pattern of shear zones. The same pattern evolves in a granular layer under gravity by extension of the base, together with a wavy surface, again as observed. With an included fine-grained layer and dislocation of the base, realistic tectonic faults are obtained. Some extensions are indicated: other boundary conditions not restricted to plane strain, interface elements for narrow shear zones, mesh-independence. Book Name: Bifurcation and Localisation Theory in Geomechanics
Related Links	https://api.taylorfrancis.com/content/chapters/edit/download?identifierName=doi&identifierValue=10.1201/9781003210931-10&type=chapterpdf
Ending Page	75
Page Count	7
Starting Page	69
DOI	10.1201/9781003210931-10
Language	English
Publisher	Informa UK Limited
Publisher Date	2021-06-18
Access Restriction	Open
Subject Keyword	Book Name: Bifurcation and Localisation Theory in Geomechanics Mechanical Engineering Stress Evolution Shear Granular Biaxial Models Boundary Void Ratio Conditions
Content Type	Text
Resource Type	Chapter

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