Implementation of a soil-structure interface constitutive model for application in geo-structures

2019 ◽  
Vol 116 ◽  
pp. 714-731 ◽  
Author(s):  
Miad Saberi ◽  
Charles-Darwin Annan ◽  
Jean-Marie Konrad
Keyword(s):  
Constitutive Model ◽  
Soil Structure

FINITE ELEMENT MODELLING OF SOIL-STRUCTURE INTERACTION

2015 ◽  
Vol 76 (8) ◽  
Author(s):  
Thevaneyan K. David ◽  
Renga Rao Krishnamoorthy ◽  
Mohamed Jais I. B.
Keyword(s):  
Finite Element ◽  
Constitutive Model ◽  
Soil Structure ◽  
Soil Structure Interaction ◽  
Background Information ◽  
Structural Behaviour ◽  
Structural Element ◽  
Element Analysis ◽  
Soil Medium ◽  
Structure Interaction

This paper presents background information relevant to the modelling of soil-structure interaction. The interaction between the structural element (i.e. pile foundation or abutments) and the soil medium is believed to have the potential to alter considerably the actual behaviour of any structure. Modelling of the structural element is rather simple and straightforward when compared to modelling the structure in interaction with soil. It is known that the structural analysis simplifies soil behaviour, while geotechnical analysis simplifies structural behaviour. The choice of an appropriate soil constitutive model may have significant influence on the accuracy of soil-structure interaction analyses. A 2D finite element analysis on a pile-cap-pile-soil model replicating actual field work was performed in this paper using OASYS SAFE to further substantiate the choice of an appropriate soil constitutive model for the purpose of soil-structure interaction modelling.

scholarly journals A Constitutive Model for Overconsolidated Structured Soils Using Structural Variable

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Wugang Li ◽  
Wenhua Liu ◽  
Zhijia Xue ◽  
Xiuli Sun
Keyword(s):  
Constitutive Model ◽  
Mechanical Behavior ◽  
Soil Structure ◽  
The Novel ◽  
Structural Index ◽  
Structural Variable ◽  
Compression Behavior ◽  
Structured Soils ◽  
Structured Soil ◽  
Compression Line

Due to the influence of soil structure, structured soils exhibit significantly different mechanical behavior compared to the reconstituted soils having the same material. In this work, a theoretical analysis focusing on the mechanical behavior of structured soils is presented. Based on the mechanical behavior of the structured soil, a newly defined variable structural index was used as a measurement of the integrity of soil structure based on the concept of intrinsic compression line of intact structured soils. Furthermore, a novel correlation for the variation in volume of structured soils is established using effective stress and newly defined structural index as the constitutive variables. The novel correlation provided interpretation about the mechanism of compression behavior of the structured soils. Afterwards, the proposed correlation for the variation in volume was extended to triaxial stress state in the framework of subloading surface to include the effect of overconsolidation. Comparisons between the predictions and experimental results validated the proposed constitutive model for structured soils.

scholarly journals Destructuration of saturated natural loess: From experiments to constitutive modeling

2020 ◽  
pp. 105678952093930
Author(s):  
Yukai Fu ◽  
Zhiwei Gao ◽  
Yi Hong ◽  
Tonglu Li ◽  
Akhil Garg
Keyword(s):  
Constitutive Model ◽  
Constitutive Modeling ◽  
Soil Structure ◽  
Triaxial Compression ◽  
Structural Effect ◽  
Triaxial Tests ◽  
Natural Soil ◽  
Special Focus ◽  
Compression Tests ◽  
Natural Loess

It has been well recognized that unsaturated natural loess shows significant volume contraction upon wetting due to its metastable internal structure. But the structural effect on stress–strain relationship of saturated natural (undisturbed) loess is much less explored. Few attempts have been made in proposing a constitutive model for saturated natural loess. This study presents both laboratory tests and constitutive modeling of a saturated natural loess, with special focus on the structural effect and evolution of structure damage during loading. Oedometer and drained triaxial compression tests have been carried out on undisturbed and remolded saturated loess samples. It is found that the natural soil structure has dramatic influence on mechanical behavior of loess, including the compressibility, dilatancy, and shear strength. Destructuration, which is the damage of soil structure with deformation, is observed in both oedometer and triaxial tests. A constitutive model is proposed for saturated loess based on the experimental observations. The model is established within the theoretical framework of subloading and superloading surface concepts. Destructuration of loess is assumed to be affected by both plastic volumetric and shear strain. A new method for determining the initial degree of structure is proposed. The model can reasonably predict the compression and shear behavior of both undisturbed and remolded saturated loess.

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.

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.

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