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Mesh Size Sensitivity and Effect of Perturbation Intensity on Coupled Undrained Instability Analysis in Sands
The sudden loss in load carrying capacity of a soil specimen from its homogeneous material response is coined as the onset of instability or bifurcation in geomaterials. A numerical investigation of the coupled undrained (globally undrained, locally drained) transient analysis in Hostun RF sand under biaxial loading has been carried out in ABAQUS along with the implementation of a user defined generalized 3D nonassociative material model. Onset of localization has been probed by inducing material heterogeneity within the numerical framework. This requires a mesh convergence study for a given perturbation intensity. Numerically predicted instability onset strain becomes practically asymptotic to the theoretically predicted value with mesh refinement. The simulations revealed -that increased intensity of material heterogeneity induced in the sand specimens significantly reduced the bifurcation onset strain.
Mesh Size Sensitivity and Effect of Perturbation Intensity on Coupled Undrained Instability Analysis in Sands
The sudden loss in load carrying capacity of a soil specimen from its homogeneous material response is coined as the onset of instability or bifurcation in geomaterials. A numerical investigation of the coupled undrained (globally undrained, locally drained) transient analysis in Hostun RF sand under biaxial loading has been carried out in ABAQUS along with the implementation of a user defined generalized 3D nonassociative material model. Onset of localization has been probed by inducing material heterogeneity within the numerical framework. This requires a mesh convergence study for a given perturbation intensity. Numerically predicted instability onset strain becomes practically asymptotic to the theoretically predicted value with mesh refinement. The simulations revealed -that increased intensity of material heterogeneity induced in the sand specimens significantly reduced the bifurcation onset strain.
Mesh Size Sensitivity and Effect of Perturbation Intensity on Coupled Undrained Instability Analysis in Sands
Bhattacharya, Debayan (author) / Prashant, Amit (author)
Eighth International Conference on Case Histories in Geotechnical Engineering ; 2019 ; Philadelphia, Pennsylvania
Geo-Congress 2019 ; 1-10
2019-03-21
Conference paper
Electronic Resource
English
| British Library Conference Proceedings | 2019
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