Premium
Hypoplastic interface models for fine‐grained soils
Author(s) -
Stutz Henning,
Mašín David
Publication year - 2016
Publication title -
international journal for numerical and analytical methods in geomechanics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.419
H-Index - 91
eISSN - 1096-9853
pISSN - 0363-9061
DOI - 10.1002/nag.2561
Subject(s) - stiffness , constitutive equation , interface (matter) , geotechnical engineering , interface model , constant (computer programming) , cauchy stress tensor , mechanics , computer science , structural engineering , engineering , mathematics , finite element method , mathematical analysis , physics , human–computer interaction , bubble , maximum bubble pressure method , programming language
Summary Contact descriptions for interfaces between structural elements (e.g. piles, anchors and tunnel‐linings) and soils are widely used in geotechnical engineering. Most of these constitutive interface models, developed for sands, consider 2D conditions. For clays, only a limited number of 3D interface models exist. In this paper, the fine‐grained continuum models based on hypoplastic theories are adapted for the constitutive modelling of fine‐grained interfaces. To this end, we develop a general approach to convert the existing continuum soil models into an interface model adopting reduced stress and strain‐rate vectors and redefining tensorial operations in such a way that the formulation of the existing continuum models can be used without much modification. The hypoplastic Cam‐clay and the explicitly formulated hypoplastic models are adapted to model the interface behaviour. In addition to the reduced stress and strain tensor formulations, we introduce an additional variable reducing the strength and stiffness of the interfaces when compared with the strength and stiffness of the soil. For verification, experiments in constant volume and constant normal stress conditions have been simulated. A comparison of the available experimental data from the literature and the simulations is presented. It is shown that the new hypoplastic interface models can describe a number of important phenomena of clay–structure interfaces. Copyright © 2016 John Wiley & Sons, Ltd.