Chapter

Holistic Simulation of Geotechnical Installation Processes

Volume 80 of the series Lecture Notes in Applied and Computational Mechanics pp 85-114

Date:

Peak Stress Obliquity in Drained and Undrained Sands. Simulations with Neohypoplasticity

  • Andrzej NiemunisAffiliated withInstitute of Soil Mechanics and Rock Mechanics, Karlsruhe Institute of Technology Email author 
  • , Carlos E. Grandas TaveraAffiliated withInstitute of Soil Mechanics and Rock Mechanics, Karlsruhe Institute of Technology
  • , Torsten WichtmannAffiliated withInstitute of Soil Mechanics and Rock Mechanics, Karlsruhe Institute of Technology

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Abstract

The difference between undrained and drained peak friction angle is considerable (up tp \(10^\circ \)), despite identical densities and pressures (at peak). This cannot be explained using the elastoplastic formalism. An attempt is made to describe this effect with neohypoplasticity. For this purpose two types of nonlinearity are used, the well-known term \(Y m_{ij} \Vert \dot{\epsilon }\Vert \) and the novel skew-symmetric correction tensor which is added to the elastic stiffness.

Keywords

Constitutive modelling Sand Dilatancy Peak friction angle Cyclic mobility