scholarly journals A simple hypoplastic model with loading surface accounting for viscous and fabric effects of clays

2020 ◽  
Vol 44 (16) ◽  
pp. 2189-2215
Author(s):  
Merita Tafili ◽  
Theodoros Triantafyllidis
Keyword(s):  
Hypoplastic Model ◽  
Loading Surface

Hypoplastic model for sands with loading surface

2012 ◽  
Vol 7 (3) ◽  
pp. 177-192 ◽  
Author(s):  
W. Fuentes ◽  
T. Triantafyllidis ◽  
A. Lizcano
Keyword(s):  
Hypoplastic Model ◽  
Loading Surface

Numerical simulation of lumpy soils using a hypoplastic model

2016 ◽  
Vol 12 (2) ◽  
pp. 349-363 ◽  
Author(s):  
X. S. Shi ◽  
I. Herle
Keyword(s):  
Numerical Simulation ◽  
Hypoplastic Model

scholarly journals Validation of a simple hypoplastic constitutive model for overconsolidated clays

2020 ◽  
Author(s):  
Shun Wang ◽  
Wei Wu
Keyword(s):  
Laboratory Tests ◽  
Constitutive Models ◽  
Standard Laboratory ◽  
Hypoplastic Model ◽  
Proposed Model ◽  
Modified Cam Clay ◽  
Overconsolidated Clays ◽  
Hypoplastic Constitutive Model ◽  
Comparison With Experiments ◽  
Cam Clay

AbstractHypoplastic constitutive models are able to describe history dependence using a single nonlinear tensorial function with a set of parameters. A hypoplastic model including a structure tensor for consolidation history was introduced in our previous paper (Wang and Wu in Acta Geotechnica, 2020, 10.1007/s11440-020-01000-z). The present paper focuses mainly on the model validation with experiments. This model is as simple as the modified Cam Clay model but with better performance. The model requires five parameters, which are easy to calibrate from standard laboratory tests. In particular, the model is capable of capturing the unloading behavior without introducing loading criteria. Numerical simulations of element tests and comparison with experiments show that the proposed model is able to reproduce the salient features of normally consolidated and overconsolidated clays.

Measurement and Calibration of the Parameters of Hypoplasticity Model for an Iraqi Soil

2020 ◽  
Vol 857 ◽  
pp. 243-252
Author(s):  
Aysar Hassan Subair ◽  
Ala Nasir Aljorany
Keyword(s):  
Constitutive Model ◽  
Void Ratio ◽  
Initial Stresses ◽  
Model Parameters ◽  
State Variables ◽  
Soil Behavior ◽  
Dense Sand ◽  
Hypoplastic Model ◽  
Material Parameters ◽  
Wide Range

There are many constitutive models that have been used to model the mechanical behavior of soils. Some of these models are either unable to represent important features such as the strain softening of dense sand or required many parameters that can be hard to obtain by standard laboratory tests. Because of that, a more reliable constitutive model, which is capable to capture the main features of the soil behavior with easily obtained parameters, is required. The Hypoplasticity model is considered as a promising constitutive model in this respect. It is considered as a particular class of rate non-linear constitutive model at which the stress increment is expressed in a tensorial equation as a function of strain increment, actual stress, and void ratio. The hypoplastic model required only eight material parameters (critical friction angle critical, maximum and minimum void ratio respectively), granular stiffness hs and the model constants n, α, β). The appealing feature of the hypoplastic model is that the material parameters are separated from the state variables (void ratio and the initial stresses). This feature enables the model to simulate the soil behavior under a wide range of stresses and densities with the same set of material parameters. In this research, a brief description of the Hypoplasticity model is presented. Detailed discussions regarding the measurement and calibration of the model parameters of an Iraqi soil are then exposed. It is concluded that only Consolidated Drained (CD) triaxial test, oedometer test, and the well-known limit density tests are needed to get all the parameters of the hypoplasticity model.

scholarly journals Extension of a basic hypoplastic model for overconsolidated clays

2020 ◽  
Vol 123 ◽  
pp. 103486 ◽  
Author(s):  
Shun Wang ◽  
Wei Wu ◽  
Dichuan Zhang ◽  
Jong Ryeol Kim
Keyword(s):  
Hypoplastic Model ◽  
Overconsolidated Clays
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