Integration of anisotropic modified Cam Clay model in finite element analysis: Formulation, validation, and application

2019 ◽  
Vol 116 ◽  
pp. 103198 ◽  
Author(s):  
K. Liu ◽  
S.L. Chen ◽  
G.Z. Voyiadjis
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Element Analysis ◽  
Clay Model ◽  
Modified Cam Clay ◽  
Cam Clay

Finite-element analysis of deep excavation in layered sandy and clayey soil deposits

1994 ◽  
Vol 31 (2) ◽  
pp. 204-214 ◽  
Author(s):  
Chang-Yu Ou ◽  
Ching-Her Lai
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Clayey Soil ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Deep Excavation ◽  
Element Analysis ◽  
Modified Cam Clay ◽  
Soil Deposits ◽  
Cam Clay

This paper presents an application of finite-element analysis to deep excavation in layered sandy and clayey soil deposits using a combination of the hyperbolic and the Modified Cam-clay models. In the analysis, the drained behavior of cohesionless soil and the undrained behavior of cohesive soil were simulated using the hyperbolic and Modified Cam-clay models, respectively. A rational procedure for determining soil parameters for each of the models was established. A simulation of the dewatering process during excavation was proposed. The analytical procedure was confirmed through an analysis of three actual excavation cases. Finally, analyses considering pore-water pressure dissipation during the actual elapsed time for each construction phase were carried out. The results indicate that the calculated displacement of a retaining wall during excavation is smaller than that given by undrained analysis. It was thought that some degree of pore-water pressure dissipation actually occurs during the intermediate excavation stages. This results in a decrease in the final deformation of the wall and ground.-surface settlement than would be predicted by undrained analysis. Key words : finite-element analysis, deep excavation, hyperbolic model, Cam-clay model.

scholarly journals RIGID PLASTIC FINITE ELEMENT METHOD USING MODIFIED CAM-CLAY MODEL

2017 ◽  
Vol 73 (2) ◽  
pp. I_333-I_342
Author(s):  
Yuki YAMAKURI ◽  
Shun-ichi KOBAYASHI ◽  
Jun SAITO ◽  
Tatsunori MATSUMOTO
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Rigid Plastic ◽  
Clay Model ◽  
Modified Cam Clay ◽  
Cam Clay ◽  
Element Method

Coupled Finite Element Analysis of Partially Embedded Offshore Pipelines during Vertical Penetration

2014 ◽  
Vol 553 ◽  
pp. 428-433
Author(s):  
Yousef Ansari ◽  
George P. Kouretzis ◽  
Dai Chao Sheng
Keyword(s):  
Finite Element ◽  
Frictional Contact ◽  
Soil Consolidation ◽  
Element Analysis ◽  
Offshore Pipelines ◽  
Vertical Resistance ◽  
Number Of Factors ◽  
Modified Cam Clay ◽  
Consolidation Rate ◽  
Cam Clay

Diverse vertical embedment response is observed for partially embedded pipelines when experimentally tested under similar initial and boundary conditions. Although vertical resistance of pipelines is presented through simple analytical solutions, a number of factors contribute to complications in implementing these theories into practice. The objectives of this research is to provide a more detailed investigation on the vertical embedment for the partially-embedded pipelines (PEPs) using a coupled large deformation finite element (CLDFE) analysis with contact. A modified Cam Clay (MCC) model represents the elastoplastic response of the soil. The model of pipeline embedment investigates the effect of drainage condition on heave forming with respect to rate of penetration. Besides, effect of frictional contact on the heave development and wedging effect is investigated and design-related considerations are proposed. It is shown that depending on the rate of pipeline penetration and soil consolidation rate, the pipeline penetration response can be categorised as undrained, partially drained or fully drained.

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.

scholarly journals Numerical modelling of soft soil stabilized by vertical drains, combining surcharge and vacuum preloading for a storage yard

2007 ◽  
Vol 44 (3) ◽  
pp. 326-342 ◽  
Author(s):  
Cholachat Rujikiatkamjorn ◽  
Buddhima Indraratna ◽  
Jian Chu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Plane Strain ◽  
Water Pressure ◽  
Vacuum Pressure ◽  
Element Analysis ◽  
Prefabricated Vertical Drains ◽  
Vertical Drains ◽  
Modified Cam Clay ◽  
Surcharge Load

This paper presents a finite element analysis of a case study of a combined vacuum and surcharge load through prefabricated vertical drains (PVD) at a storage yard at Port of Tianjin, China. The top 15 m of soil at this site was very soft to soft and needed to be improved using preloading surcharges of more than 140 kPa. To avoid any stability problems associated with a high surcharge embankment, 80 kPa vacuum pressure combined with fill surcharge was applied (40 and 58 kPa for sections I and II, respectively). A plane strain analysis was performed using equivalent permeability and transformed unit-cell geometry. The converted (equivalent) parameters were incorporated in the finite element code ABAQUS, using the modified Cam-Clay theory. The performance of a trial embankment at the site of the storage yard is predicted on the basis of a constant vacuum pressure applied on the soil surface and distributed along the length of the drain. The predictions of settlement, pore-water pressure, and lateral displacement were compared with the available field data, and an acceptable agreement was found based on this numerical approach. The combination of vacuum and surcharge load can effectively shorten the preloading period, reduce the height of the embankment, and counterbalance excessive lateral displacements.Key words: consolidation, finite element analysis, plane strain method, soil improvement, vertical drains.

The Soft Soil Foundation Consolidation Numerical Simulation Based on the Model of Modified Cam-Clay

2014 ◽  
Vol 580-583 ◽  
pp. 3223-3226 ◽  
Author(s):  
Xiao Jie Gu ◽  
Tai Quan Zhou ◽  
Song Cheng
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Soft Soil ◽  
Analysis Model ◽  
Element Analysis ◽  
Consolidation Process ◽  
Full Account ◽  
Finite Element Program ◽  
Modified Cam Clay ◽  
Element Program

The clay layer finite element analysis model , which is established by using finite element program to simulate the embankment filling , takes the intercoupling between water and clay in drainage consolidation process into full account. The use of the effective stress principle consider the characteristics of clay such as nonlinerity , large deformation and so on ,carry out the plane strain finite element analysis on the clay and solve a series of engineering problems.

scholarly journals Numerical Modelling of Oedometer Test

2020 ◽  
Vol 15 (2) ◽  
pp. 127-136
Author(s):  
Hana Agraine ◽  
Meriem Fakhreddine Bouali
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Soft Soil ◽  
Material Model ◽  
Soil Samples ◽  
Oil Field ◽  
Experimental Result ◽  
Element Analysis ◽  
Material Models ◽  
Modified Cam Clay

AbstractThe oedometric test is a test widely used in civil engineering. The main objective of this article has been to investigate the primary consolidation behaviour of the intact soil samples by comparing the results obtained from finite element analysis computations in PlAXIS2D with the experimental result of the soil samples obtained from the site of the Al-Ahdab oil field in the east of Iraq. Three different material models were utilized during the finite element analysis, comparing the performance of the more advanced constitutive Soft Soil material model against the modified Cam Clay and Mohr-Coulomb material models. Numerical results of Oedomter test show that the Soft Soil model behaviour is the most appropriate model to describe the observed behaviour.

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