A state dependent constitutive model for sand-structure interfaces

2000 ◽  
pp. 9-14
Author(s):  
A Lashkari
Keyword(s):  
Constitutive Model ◽  
State Dependent

A state-dependent constitutive model for methane hydrate-bearing sediments inside the stability region

Géotechnique ◽  
2020 ◽  
Vol 70 (12) ◽  
pp. 1094-1108 ◽  
Author(s):  
Charles Wang Wai Ng ◽  
Sina Baghbanrezvan ◽  
Tomas Kadlicek ◽  
Chao Zhou
Keyword(s):  
Constitutive Model ◽  
Methane Hydrate ◽  
Stability Region ◽  
State Dependent ◽  
The Stability ◽  
Hydrate Bearing Sediments

Viscoplastic constitutive approach for rate-sensitive structured clays

2009 ◽  
Vol 46 (6) ◽  
pp. 609-626 ◽  
Author(s):  
Sean D. Hinchberger ◽  
Guangfeng Qu
Keyword(s):  
Constitutive Model ◽  
Term Structure ◽  
Triaxial Compression ◽  
State Theory ◽  
Clay Particles ◽  
Hardening Law ◽  
State Dependent ◽  
Structured Clay ◽  
Soil Skeleton ◽  
Dependent Viscosity

This paper extends an existing elastic–viscoplastic (EVP) constitutive model using a state-dependent viscosity parameter to describe the engineering response of undisturbed structured clay. The term structure refers to the effects of fabric and weak cementation bonds between clay particles. The extended constitutive model is coupled with the Biot consolidation theory and is formulated to describe the intrinsic or unstructured response of clay using overstress viscoplasticity, an elliptical cap yield surface, Drucker–Prager failure envelope, and a hardening law from critical state theory. The clay structure is mathematically accounted for by assuming that the initial fluidity of structured clay at yield and failure is very low and that the fluidity increases with increasing plastic strain. This process is usually referred to as “destructuration.” The formulation is evaluated using Saint-Jean-Vianney (SJV) clay by comparing calculated and measured behaviour during consolidated isotropically undrained triaxial compression, triaxial creep, and constant rate-of-strain Ko′-consolidation tests. The comparisons indicate that the EVP constitutive model can describe most of the rate-sensitive behaviour of SJV clay during both drained and undrained laboratory tests involving either constant-volume shear or predominantly volumetric compression of the soil skeleton.

A constitutive model for the state-dependent behaviors of rockfill material considering particle breakage

2014 ◽  
Vol 57 (8) ◽  
pp. 1636-1646 ◽  
Author(s):  
Yang Xiao ◽  
HanLong Liu ◽  
Gui Yang ◽  
YuMin Chen ◽  
JingShan Jiang
Keyword(s):  
Constitutive Model ◽  
The State ◽  
Particle Breakage ◽  
Rockfill Material ◽  
State Dependent

scholarly journals State-dependent Dilatancy Theory and Numerical Modelling of Rockfills

2018 ◽  
Vol 7 (2) ◽  
pp. 100 ◽  
Author(s):  
Xiao-mei Li ◽  
Lin Han ◽  
Yun-fei Guan
Keyword(s):  
Constitutive Model ◽  
Large Scale ◽  
Strain Softening ◽  
Confining Pressure ◽  
State Theory ◽  
Fortran Program ◽  
The State ◽  
Test Results ◽  
Initial State ◽  
State Dependent

The dilatancy behavior of rockfills is relate to the stress level, the initial state and particle breakage. In this paper, based on the critical state theory, the state-dependent dilatancy theory of rockfills is established, and it is introduced into the state-dependent constitutive model of coarse materials, so the state-dependent constitutive model of rockfills is formulated. According to the large-scale triaxial testing results, using the Fortran program modelling the experimental results, then, comparing the test results and simulation results, only one set parameters of state-dependent constitutive model of rockfills can reflect the strain softening and dilatancy properties of rockfills under the condition of different density, gradation and confining pressure. Therefore, the rationality of the state-dependent constitutive model of rockfills is verified.

scholarly journals A State-Dependent Constitutive Model for Gas Hydrate-Bearing Sediments Considering Cementing Effect

2020 ◽  
Vol 8 (8) ◽  
pp. 621
Author(s):  
Qingmeng Yuan ◽  
Liang Kong ◽  
Rui Xu ◽  
Yapeng Zhao
Keyword(s):  
Constitutive Model ◽  
Gas Hydrate ◽  
Prediction Performance ◽  
Strain Behavior ◽  
Mixed Hardening ◽  
Hardening Law ◽  
State Dependent ◽  
Hydrate Saturation ◽  
Hardening Theory ◽  
Hydrate Bearing Sediments

This paper presents a state-dependent constitutive model for gas hydrate-bearing sediments (GHBS), considering the cementing effect for simulating the stress–strain behavior of GHBS. In this work, to consider the influence of hydrate on matrix samples in theory, some representative GHBS laboratory tests were analyzed, and it was found that GHBS has obvious state-related characteristics. At the same time, it was found that GHBS has high bonding strength. In order to describe these characteristics of GHBS, the cementation strength related to hydrate saturation is introduced in the framework of a sand state correlation model. In addition, in order to accurately reflect the influence of cementation on the hardening law of GHBS, the degradation rate of cementation strength is introduced, and the mixed hardening theory is adopted to establish the constitutive model. The model presented in this paper reproduces the experimental results of Masui et al. and Miyazaki et al., and the prediction performance of the model is satisfactory, which proves the rationality of this work.

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