Research on the Prediction and Calculation Method of Settlement of Red Clay Foundation

2014 ◽  
Vol 998-999 ◽  
pp. 1444-1447
Author(s):  
Yuan Zhong Zhou ◽  
Xin Rong Liu ◽  
Yu Yu
Keyword(s):  
Finite Element ◽  
Finite Element Methods ◽  
Calculation Method ◽  
Geometric Nonlinearity ◽  
Red Clay ◽  
Modified Cam Clay ◽  
Deformation Behaviors ◽  
Oil Tank ◽  
Better Than ◽  
Cam Clay

A Modified Cam-Clay Model and finite element methods (FEM) are used in this paper to analyze the deformation and settlement of red clay foundation. The results show: (1)The deformation of oil tank foundation calculated is close to that measured and the effect of geometric nonlinearity is small. (2) Geometry of loading and level of stress have important effects on the deformation behaviors of red clay foundations. In practice the result of elastic-plastic FEM is much better than that of classical calculated methods (CCM).

Compression and consolidation characteristics of structured natural clay

2004 ◽  
Vol 41 (6) ◽  
pp. 1250-1258 ◽  
Author(s):  
J -C Chai ◽  
N Miura ◽  
H -H Zhu ◽  
Yudhbir
Keyword(s):  
Numerical Analysis ◽  
Void Ratio ◽  
Natural Clay ◽  
Hardening Law ◽  
Modified Cam Clay ◽  
Calculated Load ◽  
Natural Clays ◽  
Consolidation Behavior ◽  
Better Than ◽  
Cam Clay

The compression and consolidation behavior of some structured natural clays are discussed. It is shown that for some structured natural clays, the relation between void ratio (e) and mean effective stress (p′) is more linear in a ln(e + ec) – ln(p′) plot (where ec is a soil parameter) than in an e – ln(p′) plot. It is proposed that for structured natural clay with a sensitivity value greater than 4, a linear ln(e + ec) – ln(p′) relation can be used in settlement and consolidation calculation. The effect of introducing a linear ln(e + ec) – ln(p′) relation on the calculated load–settlement curve and consolidation behavior of structured clays is discussed. The linear ln(e + ec) – ln(p′) relation was incorporated into the modified Cam–clay model by modifying the hardening law of the model. It is shown that using the linear ln(e + ec) – ln(p′) relation simulated the consolidation behavior of the structured natural clays better than using the linear e – ln(p′) relation.Key words: structured natural clay, compression, consolidation, constitutive model, numerical analysis.

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.

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.

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 Finite element analyses of energy piles using different constitutive models

2020 ◽  
Vol 205 ◽  
pp. 05013
Author(s):  
Chiara Iodice ◽  
Raffaele Di Laora ◽  
Alessandro Mandolini
Keyword(s):  
Finite Element ◽  
Constitutive Models ◽  
Single Pile ◽  
Finite Element Analyses ◽  
Energy Pile ◽  
State Of Stress ◽  
Modified Cam Clay ◽  
Energy Piles ◽  
Fully Coupled ◽  
Cam Clay

Energy piles are foundation elements having the double scope of transferring structural loads from the structure to the ground and of exchanging heat with the surrounding soil. It follows that pile state of stress and settlement are altered by the time-dependent temperature change in both pile and soil. This work is aimed at investigating the effect of thermal cycles on the behaviour of a single energy pile. To this end, fully coupled thermo-hydro-mechanical analyses have been carried out using the Finite Element code ABAQUS. The single pile is installed in a normally consolidated clay behaving according to different constitutive models involving Mohr-Coulomb, Modified Cam Clay and Hypoplastic. The latter is employed with and without the thermal formulation capable of accounting for the thermal collapse of NC clays during heating. A single free-head pile is considered and the results are presented in terms of pile axial force and settlement developed cycle by cycle.

311 Numerical simulation of plastic deformation behaviors by poly crystal plastic finite element methods

2012 ◽  
Vol 2012.50 (0) ◽  
pp. 31101-31102
Author(s):  
Seiya Ono ◽  
Takahiro Kageyama ◽  
Takumi Kobayashi ◽  
Kohshiroh Kitayama ◽  
Takeshi Uemori ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Plastic Deformation ◽  
Finite Element ◽  
Finite Element Methods ◽  
Deformation Behaviors
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