Simulation of cyclic strength degradation of natural clays via bounding surface model with hybrid flow rule

2018 ◽  
Vol 42 (14) ◽  
pp. 1719-1740 ◽  
Author(s):  
Z. Shi ◽  
G. Buscarnera ◽  
R. J. Finno
Keyword(s):  
Cyclic Strength ◽  
Strength Degradation ◽  
Surface Model ◽  
Flow Rule ◽  
Bounding Surface ◽  
Natural Clays

An Associative and Non-Associative Anisotropic Bounding Surface Model for Clay

2012 ◽  
Vol 79 (3) ◽  
Author(s):  
Jianhong Jiang ◽  
Hoe I. Ling ◽  
Victor N. Kaliakin
Keyword(s):  
Mechanical Behavior ◽  
Strain Hardening ◽  
Strain Softening ◽  
Surface Model ◽  
Flow Rule ◽  
Reasonable Accuracy ◽  
Bounding Surface ◽  
Softening Behavior ◽  
Different Types ◽  
Undrained Behavior

An anisotropic elastoplastic bounding surface model with non-associative flow rule is developed for simulating the mechanical behavior of different types of clays. The non-associative flow rule allows for the simulation of not only strain-hardening but also strain-softening response. The theoretical framework of the model is given, followed by the verification of the model as applied to the experimental results of a strain-hardening Kaolin tested under different undrained stress paths. The undrained behavior of Boston Blue clay, which exhibits a strain-softening behavior, is also simulated. It is shown that the non-associative nature of the model gives more accurate results than those of the same model employing an associative flow rule, especially for normally consolidated Kaolin specimens. The results show that the model is also capable of simulating the strain-softening behavior of Boston blue clay with reasonable accuracy.

scholarly journals SIMULATING THE BEHAVIOR OF SOFT COHESIVE SOILS USING THE GENERALIZED BOUNDING SURFACE MODEL

2019 ◽  
Vol 15 (3) ◽  
pp. 55-76
Author(s):  
Victor Kaliakin ◽  
Andres Nieto-Leal
Keyword(s):  
Computational Cost ◽  
Constitutive Models ◽  
Surface Model ◽  
Flow Rule ◽  
Cohesive Soils ◽  
Bounding Surface ◽  
True Triaxial ◽  
Dependent Model ◽  
Complex Forms ◽  
Temperature Dependent Model

The Generalized Bounding Surface Model (GBSM) for saturated cohesive soils is a fully three­dimensional, time and temperature-dependent model that accounts for both inherent and stress induced anisotropy. To better simulate the behavior of cohesive soils exhibiting softening, the model employs a non­associative flow rule. The GBSM synthesizes many previous bounding surface constitutive models for saturated cohesive soils and improves upon their predictive capabilities. For those cases where the use of the more complex forms of the GBSM is not justified, the model can be adaptively changed to simpler forms, thus reducing the number of associated parameters, giving flexibility to the simulations and reducing the computational cost. Following a brief overview of the GBSM, the model's performance in simulating the response of soft, saturated cohesive soils is assessed under both axisymmetric and true triaxial conditions.

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