Determination of Parameter in SYS Cam-Clay Model of Ultra-Soft Clay

2015 ◽  
Vol 744-746 ◽  
pp. 470-473
Author(s):  
Bin Bin Xu ◽  
Toshihiro Noda
Keyword(s):  
Constitutive Model ◽  
Soil Structure ◽  
Soft Clay ◽  
Numerical Results ◽  
Plastic Model ◽  
Clay Model ◽  
The World ◽  
Practical Engineering ◽  
Cam Clay

Parameter analyses in the constitutive model determine the precision of numerical results. Cam-clay model is the first elasto-plastic model in the world and widely used in the practical engineering. SYS Cam-clay model is proposed based on Cam-clay model by incorporating the concept of overconsolidation, soil structure and anisotropy. There are two groups of parameters in this model, elasto-plastic parameters that are exactly same as those in Cam-clay model and evolutional parameters that decide the variation of overconsolidation, soil structure and anisotropy. The detailed process to determine the parameters is introduced step by step.

Numerical modelling of a centrifuged embankment on soft clay

1986 ◽  
Vol 23 (2) ◽  
pp. 103-114 ◽  
Author(s):  
M. S. S. Almeida ◽  
A. M. Britto ◽  
R. H. G. Parry
Keyword(s):  
Void Ratio ◽  
Soft Clay ◽  
Linear Elastic ◽  
Clay Model ◽  
Pore Pressures ◽  
Dissipation Rates ◽  
Vertical Displacements ◽  
The Difference ◽  
Cam Clay

Biot coupled consolidation numerical analyses have been applied to a stage-constructed embankment on soft clay in the centrifuge. In the test, the sand embankment was constructed during flight on a clay foundation consisting of an overconsolidated crust overlying a normally consolidated layer. Measurements were taken of pore pressures, dissipation rates, and displacements in the foundation clay. Predictions of these were made using a simple Cam-clay model for the clay and the Cambridge CRISP computer program. A linear elastic idealization was used for the embankment. With some exceptions, pore pressures and dissipation rates were very well predicted, as were maximum values of both horizontal and vertical displacements. However, displacement profiles with depth were not so well predicted. Particular attention is given in the paper to the determination of relevant values of shear modulus G and the difference in behaviour resulting from using constant permeability and permeability varying with void ratio. Key words: embankments, soft clay, centrifuge test, numerical analysis, Biot consolidation, Cam-clay model.

Determination of the parameters of Modified Cam-Clay model for paddy grain

2017 ◽  
Vol 76 ◽  
pp. 1-7 ◽  
Author(s):  
Xiaocui Du ◽  
Xuduo Cheng ◽  
Mengyao Gao
Keyword(s):  
Clay Model ◽  
Modified Cam Clay ◽  
Cam Clay

A structured Cam Clay model

2002 ◽  
Vol 39 (6) ◽  
pp. 1313-1332 ◽  
Author(s):  
M D Liu ◽  
J P Carter
Keyword(s):  
Parametric Study ◽  
Soil Structure ◽  
Constitutive Relations ◽  
Calcareous Soils ◽  
New Model ◽  
Clay Model ◽  
Proposed Model ◽  
Modified Cam Clay ◽  
Structured Soils ◽  
Cam Clay

A theoretical study of the behaviour of structured soil is presented. A new model, referred to as the Structured Cam Clay model, is formulated by introducing the influence of soil structure into the Modified Cam Clay model. The proposed model is hierarchical, i.e., it is identical to the Modified Cam Clay soil model if a soil has no structure or if its structure is removed by loading. Three new parameters describing the effects of soil structure are introduced, and the results of a parametric study are also presented. The proposed model has been used to predict the behaviour of structured soils in both compression and shearing tests. By making comparisons of predictions with experimental data and by conducting the parametric study it is demonstrated that the new model provides satisfactory qualitative and quantitative modelling of many important features of the behaviour of structured soils.Key words: calcareous soils, clays, fabric, structure, constitutive relations, plasticity.

Elasto-Plastic Constitutive Model Considering the Influences of Soil Structure and Anisotropy

2013 ◽  
Vol 405-408 ◽  
pp. 478-482
Author(s):  
Guang Qin Cui ◽  
Zeng Rong Liu ◽  
Chen Guang Ma
Keyword(s):  
Constitutive Model ◽  
Soil Structure ◽  
Structural Parameters ◽  
Natural Soil ◽  
Strain Behavior ◽  
Modified Cam Clay ◽  
Practical Engineering ◽  
Evolution Laws ◽  
Geotechnical Tests ◽  
Anisotropic Tensor

Structure and anisotropy are two fundamental aspects of natural clays. They cant be ignored because of their significant influences on soils strength and stress-strain behavior, etc. Therefore, anisotropic tensor and structural parameters are introduced in Modified Cam Clay Model which is only suitable for isotropic remolded clays, and evolution laws of them are given in this paper. Thus, an elasto-plastic constitutive model considering the influences of natural soil structure and anisotropy is established. Most parameters involved in this model have explicit physical meaning and are easily determined through geotechnical tests, which makes this model more flexible, practical and applicable to practical engineering.

scholarly journals A simple hypoplastic model for overconsolidated clays

2021 ◽  
Author(s):  
shun wang ◽  
Wei Wu
Keyword(s):  
Constitutive Model ◽  
Structure Tensor ◽  
History Dependence ◽  
Hypoplastic Model ◽  
Clay Model ◽  
Modified Cam Clay ◽  
Overconsolidated Clays ◽  
Independent Parameters ◽  
Hypoplastic Constitutive Model ◽  
Cam Clay

This paper presents a simple hypoplastic constitutive model for overconsolidated clays. The model needs five independent parameters and is as simple as the modified Cam Clay model but with better performance. A structure tensor is introduced to account for the history dependence. Simulations of various elementary tests show that the model is capable of capturing the salient behavior of overconsolidated clays.

Analysis of the Treatment of Soft Soil Considering Rheological Property

2012 ◽  
Vol 518-523 ◽  
pp. 4417-4420
Author(s):  
Yong Quan Li ◽  
Jun Fu Chen ◽  
Yun Zhong Tu ◽  
Xiao Tao Yuan
Keyword(s):  
Finite Element ◽  
Soft Soil ◽  
Plastic Model ◽  
Clay Model ◽  
Foundation Treatment ◽  
Soft Foundation ◽  
Modified Cam Clay ◽  
Tailing Dam ◽  
Double Yield ◽  
Cam Clay

viscoelasto-plastic; double yield surface; equivalent sand wall; finite element; Abstract. Based on double yield elastoplastic model, one viscoelasto-plastic model is dealt with in detail. The method of transferring to equivalent sand wall is introduced when soft soil is treated by plastic drainage plate. The viscoelasto-plastic model and modified Cam-Clay model are applied into the finite element calculation of soft foundation treatment of a tailing dam. By comparison, it can be got that the displacement calculated by the viscoelasto-plastic model is closer to monitoring data than that calculated by modified Cam-Clay model. It demonstrates the reasonableness and efficiency of the viscoelasto-plastic model．

scholarly journals Evaluation of Hypoplastic Clay Model for Deep Excavation Modelling

2016 ◽  
Vol 62 (4) ◽  
Author(s):  
M. Mitew-Czajewska
Keyword(s):  
Accurate Determination ◽  
Deep Excavation ◽  
Element Analysis ◽  
Clay Model ◽  
Modified Cam Clay ◽  
Vertical Displacements ◽  
Cam Clay

AbstractThis paper presents an evaluation of the Hypoplastic Clay constitutive model for finite element analysis of deep excavations and displacements induced by excavations in the influence zone. A detailed description and formulation of the Hypoplastic Clay soil model is included. A parametric case study of a deep excavation executed in Pliocene clays is presented. FE analysis was performed using several soil models (Mohr-Coulomb, Modified Mohr-Coulomb, Drucker-Prager, Modified Cam-Clay, Hypoplastic Clay) and the results were compared to in-situ displacements measurements taken during construction. Final conclusions concerning the suitability of the Hypoplastic Clay model for deep excavation modelling in terms of accurate determination of horizontal displacements of the excavation wall, the uplift of the bottom of excavation, and, most importantly, vertical displacements of the terrain in the vicinity of the excavation are presented.

Hysteresis Model for Superelasticity of Shape Memory Alloy Based on ANN

2007 ◽  
Vol 340-341 ◽  
pp. 1175-1180 ◽  
Author(s):  
Hong Nan Li ◽  
Di Cui ◽  
Gang Bing Song
Keyword(s):  
Shape Memory Alloy ◽  
Constitutive Model ◽  
Shape Memory ◽  
Engineering Application ◽  
High Accuracy ◽  
Niti Shape Memory Alloy ◽  
Hysteresis Model ◽  
Practical Engineering ◽  
Artificial Neural Network Ann

Superelasticity is one of the most important properties of shape memory alloy. In this paper, the superelastic deformation behavior of NiTi shape memory alloy subjected to cyclic loading with stable superelasticity is experimentally investigated. According to test data, a constitutive model for the superelasticity of shape memory alloy is presented based on the artificial neural network (ANN). Numerical results agree well with experimental observations that verified the constitutive model being of high accuracy. This model can avoid the difficulties of other models on the determination of the parameters and is suitable for practical engineering application. Thus, a new method is provided for building the constitutive model of shape memory alloy.

scholarly journals An Elastic-Viscoplastic Model for Time-Dependent Behavior of Soft Clay and Its Application on Rheological Consolidation

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Jinzhu Li ◽  
Wenjun Wang ◽  
Yijun Zhu ◽  
Haofeng Xu ◽  
Xinyu Xie
Keyword(s):  
Soil Column ◽  
Soft Clay ◽  
Confining Pressure ◽  
Time Dependent ◽  
Strain Effect ◽  
Rheological Characteristics ◽  
Clay Model ◽  
Dependent Behavior ◽  
Modified Cam Clay ◽  
Cam Clay

To describe the time-dependent behavior of soft clay, this paper extended one-dimensional Nishihara model to three-dimensional stress state based on the framework of Perzyna’s overstress theory and modified cam-clay model. The yield criterion of modified cam-clay model was used to describe the plastic properties of soft clay, and the overstress theory was used to describe the strain rate effect. Triaxial rheological tests were carried out on Ningbo soft clay and the rheological characteristics were studied. Based on laboratory results, the parameters of proposed model were determined by curve fitting, which show that this model is suitable for the rheological characteristics of Ningbo soft clay. The analysis of parameters shows that, the value of parameters changes slightly with different deviatoric stress when the confining pressure was constant, but changes notably with the increase of confining pressure. A user material subroutine of the proposed constitutive mode was coded on the platform of the FEM software ABAQUS and verified by triaxial compression of soil column. A plain strain problem was computed to analyze the rheological consolidation properties of soft clay, in which the rheological effect and the finite strain effect were considered.

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